CN108055004B - Photovoltaic solar cell transient state photocurrent full-automatic test system and test method - Google Patents
Photovoltaic solar cell transient state photocurrent full-automatic test system and test method Download PDFInfo
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- CN108055004B CN108055004B CN201711306789.3A CN201711306789A CN108055004B CN 108055004 B CN108055004 B CN 108055004B CN 201711306789 A CN201711306789 A CN 201711306789A CN 108055004 B CN108055004 B CN 108055004B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
本发明涉及一种光伏太阳能电池瞬态光电压全自动测试系统及测试方法，其特征在于，该全自动测试系统包括：用于固定待测光伏电池器件的光伏电池夹具；用于使待测光伏电池器件内部产生稳态光电压信号的稳态光源；用于使待测光伏电池器件内部产生瞬态光电压信号的瞬态脉冲光源；用于切断或连通瞬态脉冲光辐照的光路控制开关；用于调节瞬态脉冲光源光强的光强调节单元；用于实时采集稳态光电压变化信号和瞬态光电压变化信号的瞬态信号采集记录单元；用于根据稳态光电压变化信号和瞬态光电压变化信号实时调节稳态光源和瞬态脉冲光源的光强以及记录完整的瞬态光电压信号衰减曲线，实现全自动数据获取的计算机，本发明可广泛用于光伏半导体技术领域中。
The invention relates to a photovoltaic solar cell transient photovoltage automatic test system and test method, characterized in that the automatic test system comprises: a photovoltaic cell fixture for fixing a photovoltaic cell device to be tested; A steady-state light source for generating a steady-state photovoltage signal inside the battery device; a transient pulse light source for generating a transient photovoltage signal inside the photovoltaic cell device to be tested; an optical path control switch for cutting off or connecting the transient pulsed light irradiation ; A light intensity adjustment unit for adjusting the light intensity of a transient pulsed light source; a transient signal acquisition and recording unit for real-time acquisition of steady-state photovoltage change signals and transient photovoltage change signals; A computer for realizing automatic data acquisition by adjusting the light intensity of the steady state light source and the transient pulse light source in real time with the transient photovoltage change signal and recording the complete transient photovoltage signal decay curve, and the invention can be widely used in the technical field of photovoltaic semiconductors. middle.
Description
Technical field
The present invention relates to a kind of photovoltaic solar cell transient state photocurrent full-automatic test system and test methods, belong to
Photovoltaic semiconductors technical field.
Background technique
The continuous consumption of the development of human society and the too busy to get away energy of progress, with the gradually quickening of historical development process,
People are growing day by day for the demand of the energy, and to the utilization mode of fossil energy rough type, not only energy utilization rate is low can also be made
At serious environmental pollution, force current people that must find cleaning, close friend and sustainable new energy, Neng Goutong as early as possible
Cross the photovoltaic solar cell that photovoltaic effect directly converts solar energy into electrical energy, become most rich desired new energy it
One.Currently, solar battery is reformed after several generations, from silicon semiconductor solar battery to thin-film solar cells, then new one is arrived
For organic solar batteries, dye-sensitized solar cells.The perovskite solar battery being a dark horse in recent years is even more to develop
Rapidly, 20% high point of photoelectric conversion efficiency hasty breaching, the photoelectric conversion performance for constantly promoting photovoltaic solar cell is photovoltaic
The eternal theme of the task and photovoltaic art that field scientific research personnel is eternally immutable.
It is deep to understand photovoltaic solar cell photoelectric conversion mechanism, spy while sight is focused on technology and technique
It is not to cause the photo-generated carrier multiple mechanism of energy loss that will be important project, is to further increase photovoltaic solar cell
Theoretical basis.Photovoltaic solar cell completes electron excitation in valence band to conduction band from solar energy when illumination irradiates
Conversion and storage to electrochemical potential energy are got off, and stored energy is transported to external circuit as carrier using electronics and externally does work,
Complete the conversion and utilization of solar energy.In this course, the defect state attribute inside photovoltaic device (including defect state density,
Defect state distribution etc.) it significantly affects the transporting of carrier, collect and recombination process, therefore, for photovoltaic cell defect state category
Property and Carrier recombination process detection and analysis, to understanding photovoltaic device photoelectric conversion process have important scientific meaning.
Currently, the method that research photovoltaic solar cell defect state attribute and Carrier recombination process have developed has intensity
Modulated photocurrent and photovoltaic spectrum, electrochemical impedance spectroscopy and time resolution photoelectric current and photovoltaic spectrum, wherein intensity-modulated light
Electric current and photovoltaic spectrum and electrochemical impedance spectroscopy belong to frequency domain measuring method, it is desirable that technical staff has sturdy dielectric
Physical theory basis, Data Management Analysis process is complicated, and especially electrochemical impedance spectroscopy needs to construct precircuit, precircuit
Selection greatly affect the understanding and cognition for Germicidal efficacy phenomenon, these problems improve the technology of method significantly
Threshold.And time resolution photoelectric current and photovoltaic spectrum belong to ime-domain measuring method, measurement result and Data Analysis Services are all straight
See understandable, and be easy to operate, but this method needs to constantly change limit, and each limit respectively correspond it is similar
There are a large amount of cumbersome duplicate work, significantly reduce the working efficiency of technical staff, waste preciousness in data acquisition operations
Technical resource.
Summary of the invention
In view of the above-mentioned problems, can cut down the object of the present invention is to provide one kind, technical staff's amount of labour, develop skill people
The photovoltaic solar cell transient state photocurrent full-automatic test system and test method of member's working efficiency.
To achieve the above object, the present invention takes following technical scheme: a kind of photovoltaic solar cell transient state photocurrent is complete
Auto-Test System, which is characterized in that the full-automatic test system includes: the photovoltaic electric for fixing photovoltaic cell device to be measured
Pond fixture；To generate inside the photovoltaic cell device to be measured for issuing the steady-state light irradiation photovoltaic cell device to be measured
The stable light source of steady-state surface photovoltage signal；For issue transient pulse light irradiate the photovoltaic cell device to be measured make it is described to
It surveys inside photovoltaic cell device and generates the transient pulse light source of transient state photocurrent signal, wherein the hot spot of transient pulse light and steady
The hot spot of state light can be overlapped at the photovoltaic cell device to be measured；It is fixed at the transient pulse light source and light to be measured
For cutting off or being connected to the light path control switch of transient pulse light irradiation in optical path between volt battery device；It is fixed at institute
It states in the optical path between transient pulse light source and photovoltaic cell device to be measured for adjusting the light intensity tune of transient pulse light source intensity
Save unit；For acquiring the transient signal acquisition and recording list of steady-state surface photovoltage variable signal and transient state photocurrent variable signal in real time
Member；And for according to steady-state surface photovoltage variable signal and transient state photocurrent variable signal adjust in real time the stable light source and
The light intensity of transient pulse light source, and complete transient state photocurrent signal attenuation curve is recorded, realize full-automatic data acquisition
Computer.
Further, parameter setting module, stable light source adjustment module, transient pulse light source are provided in the computer
Adjustment module and data processing module；The parameter setting module is used to preset the stable state of the photovoltaic cell device to be measured
Condition, maximum steady state criterion and perturbation condition, the scanning range and scanning gradient of steady-state surface photovoltage and the transient signal are adopted
Collect recording unit window parameter, and be accordingly sent to the stable light source adjustment module, transient pulse light source adjustment module and
Data processing module；The stable light source adjustment module is used to control opening or closing for the stable light source, and according to institute
State steady-state surface photovoltage variable signal that transient signal acquisition and recording unit acquires in real time and preset limit adjust it is described steady
The light intensity of state light source, so that the steady-state surface photovoltage signal that the photovoltaic cell device to be measured generates meets preset limit；
The transient pulse light source adjustment module is used to control the unlatching of the transient pulse light source, and is acquired according to the transient signal
The transient state photocurrent variable signal and preset perturbation condition that recording unit acquires in real time, send a signal to the optical path control respectively
System switch and light intensity regulating unit are led to by being shut on or off for transient pulse light source described in the light path control switch control
The light intensity that the light intensity regulating unit adjusts the transient pulse light source is crossed, so that the wink that the photovoltaic cell device to be measured generates
State photoelectric signal meets preset perturbation condition；The data processing module is used for according to the transient signal acquisition and recording list
Transient state photocurrent amplitude, 90%~100% required time of transient state photocurrent decaying and the preset window parameter of member acquisition, sentence
Whether the transient state photocurrent signal attenuation curve that the transient signal acquisition and recording unit acquires that breaks is complete, if transient state photocurrent is believed
Number attenuation curve is complete, then according to the scanning of the maximum steady state criterion of preset photovoltaic cell device to be measured and steady-state surface photovoltage
Range and scanning gradient obtain all complete transient state photocurrent signal decaying of the transient signal acquisition and recording unit record
Curve completes the full-automatic testing of transient state photocurrent.
Further, the stable light source includes pressure stabilizing/or constant-current supply and LED light, described in the LED light electrical connection
Pressure stabilizing/or constant-current supply, the pressure stabilizing/or constant-current supply are electrically connected the computer；Alternatively, the stable light source uses program
The continuous semiconductor laser of control, the continuous semiconductor laser are electrically connected the computer.
Further, the transient pulse light source uses semiconductor laser or high speed LED light, the semiconductor laser
Or high speed LED light is electrically connected the computer.
Further, the light path control switch is using high-speed shutter or mechanical electric guard board, the high-speed shutter or machine
Tool electric guard board is electrically connected the computer.
Further, the light intensity regulating unit includes turntable, 1/2 wave plate and Glan prism, the turntable top
It is fixedly connected with 1/2 wave plate, in the optical path of the transient pulse light source, the turntable and photovoltaic cell device to be measured
Between be fixedly installed the Glan prism, the turntable is also electrically connected the computer；Alternatively, the light intensity regulating unit
Using variable optical attenuator, the fibre optic attenuator is located in the optical path of the transient pulse light source, and the variable optical attenuator is electrically connected
Connect the computer.
Further, the transient signal acquisition and recording unit uses digital oscilloscope or data acquisition card, the number
Oscillograph or data acquisition card are electrically connected the computer.
A kind of photovoltaic solar cell transient state photocurrent full-automatic testing method, which comprises the following steps: step
It is rapid 1): photovoltaic cell device to be measured is fixed on photovoltaic cell fixture, control pressure stabilizing/or constant-current supply output voltage/
Or electric current lightening LED lamp, light path control switch is opened, the optical path for adjusting stable light source and transient pulse light source makes steady-state light
Hot spot is overlapped with the hot spot of transient pulse light on photovoltaic cell device to be measured, and by photovoltaic cell device positive and negative anodes to be measured and wink
State signal acquisition recording unit accordingly connects；Step 2): photovoltaic cell device to be measured in transient state photocurrent test process is preset
Limit, maximum steady state criterion and the perturbation condition and the scanning range of steady-state surface photovoltage and scanning gradient of part；Step
3): closing light path control switch, adjust the initial voltage/or electric current of pressure stabilizing/or constant-current supply, steady-state light is irradiated to photovoltaic to be measured
Battery device makes it generate steady-state surface photovoltage signal, and transient signal acquisition and recording unit carries out the steady-state surface photovoltage signal of generation
It acquires and is sent to computer；Step 4): computer judges whether steady-state surface photovoltage variable signal meets preset limit,
If meeting limit, enter step 5)；If being unsatisfactory for limit, enters step and 3) change the defeated of pressure stabilizing/or constant-current supply
Voltage/or electric current out；Step 5): maintaining the light intensity of stable light source constant, opens light path control switch and light intensity regulating unit, wink
The transient pulse light that state light-pulse generator issues is irradiated to photovoltaic cell device to be measured after adjusting makes it generate transient state photocurrent letter
Number, transient signal acquisition and recording unit is acquired the transient state photocurrent signal of generation and is sent to computer；Step 6): meter
Calculation machine judges whether transient state photocurrent variable signal meets preset perturbation condition and enter step 7) if meeting perturbation condition；If
It is unsatisfactory for perturbation condition, enters step the light intensity for 5) changing transient pulse light source；Step 7): stable light source and transient pulse are maintained
The light intensity of light source is constant, obtains transient state photocurrent signal attenuation curve, the transient state photoelectricity of the unit record of transient signal acquisition and recording
Pressure amplitude value and the required time of transient state photocurrent decaying 90%~100%, and set the window of transient signal acquisition and recording unit
Mouth parameter；Step 8): computer judges whether the transient state photocurrent signal attenuation curve obtained is complete, if transient state photocurrent amplitude
Meet preset window parameter with the required time of transient state photocurrent decaying 90%~100%, then the transient state photocurrent letter obtained
Number attenuation curve is complete, enters step 9)；If transient state photocurrent amplitude and transient state photocurrent decaying 90%~100% are taken
Between be unsatisfactory for preset window parameter, then the transient state photocurrent signal attenuation curve obtained is imperfect, enters step and 7) sets again
Determine the window parameter of transient signal acquisition and recording unit；Step 9): complete transient state photoelectricity under the scanning gradient is collected and recorded
Press signal attenuation curve；Step 10): steady-state criterion is successively changed according to the scanning gradient voltage of setting, repeats step 3)~9)
Until steady-state criterion reaches preset maximum steady state criterion, it is bent to collect and record all complete transient state photocurrent signal decaying
Line completes the full-automatic testing of transient state photocurrent.
Further, the steady of photovoltaic cell device to be measured in transient state photocurrent test process is preset in the step 2)
State condition, maximum steady state criterion and perturbation condition and the scanning range of steady-state surface photovoltage and scanning gradient, specifically: 1. set
The limit of fixed photovoltaic cell device to be measured:
|Vph-V′ph| < 3mV
Wherein, VphFor the steady-state surface photovoltage variable signal that photovoltaic cell device to be measured generates, V 'phFor steady-state criterion；2. setting
The maximum steady state criterion of fixed photovoltaic cell device to be measured, i.e. setting steady-state criterion V 'phMaximum value be 1000mV or open-circuit voltage
Voc；3. set the scanning range of steady-state surface photovoltage as 0 to maximum steady state criterion, set the scanning gradient of steady-state surface photovoltage as
25mV；4. setting the perturbation condition of photovoltaic cell device to be measured:
ΔVph< Vph* 5%
Wherein, Δ VphThe transient state photocurrent variable signal generated for photovoltaic cell device to be measured.
The invention adopts the above technical scheme, which has the following advantages: 1, the present invention is due to being provided with transient signal
Acquisition and recording unit and computer can be such that photovoltaic cell device to be measured stablizes in preset state, certainly by the control of computer
So that transient state photocurrent signal is limited in default perturbation condition, automatic feedback is adjusted dynamic feedback regulation transient pulse light source intensity
The window parameter of transient signal acquisition and recording unit is so that data record complete and accurate, recycles above-mentioned step in established condition automatically
Suddenly, judgement and data record are terminated, can advantageously realize that photovoltaic solar cell transient state photocurrent is tested, improve photovoltaic too
The positive energy dynamic (dynamical) defect state distribution measuring efficiency of battery Carrier recombination.2, present invention design reduces test method technology door
Sill, technical staff are not required to Special Training and can be operated complete data acquisition；Test process is carried out automatically controlling by computer, greatly
Ground reduces the duplication of labour of technical staff, allows a technician to preferably pay close attention to research object itself, improve work efficiency；
Each time experiment test criteria is consistent, improves the comparativity of experiment test；Judge strictly to be completed according to criterion by computer, reduce
Human interference and error, improve measuring accuracy, can be widely applied in photovoltaic semiconductors technical field.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of full-automatic test system of the present invention；
Fig. 2 is the flow chart of full-automatic testing method of the present invention；
Fig. 3 is the comparative examples figure of present invention actual measurement steady-state surface photovoltage and default limit；
Fig. 4 is the relation schematic diagram of transient state photocurrent attenuation process and time that the present invention detects；
Fig. 5 is that the present invention detects transient state photocurrent decaying kinetics schematic diagram；
Fig. 6 is the relationship signal of the photovoltaic cell carrier lifetime that institute's detection data of the present invention obtains and steady-state surface photovoltage
Figure, whereinIndicate experimental data,Indicate fitting data.
Specific embodiment
Come to carry out detailed description to the present invention below in conjunction with attached drawing.It should be appreciated, however, that attached drawing has been provided only more
Understand the present invention well, they should not be interpreted as limitation of the present invention.
As shown in Figure 1, photovoltaic solar cell transient state photocurrent full-automatic test system provided by the invention includes photovoltaic
Battery clamp 1, stable light source 2, transient pulse light source 3, light path control switch 4, light intensity regulating unit 5, transient signal acquisition note
Record unit 6 and computer 7.
Photovoltaic cell fixture 1 is for fixing photovoltaic cell device to be measured.
Stable light source 2 irradiates photovoltaic cell device to be measured for issuing steady-state light, so that inside photovoltaic cell device to be measured
Stable photo-generated carrier is excited, maintains certain energy state occupied state, and then generate steady-state surface photovoltage signal.
Transient pulse light source 3 irradiates photovoltaic cell device to be measured for issuing transient pulse light, so that photovoltaic cell to be measured
The photo-generated carrier that device inside excites transient state a small amount of forms quasi-equilibrium state, and then generates transient state photocurrent signal to steady-state light
Voltage signal generates transient state perturbation, and the hot spot of transient pulse light and the hot spot of steady-state light can be at photovoltaic cell devices to be measured
It is overlapped.
Light path control switch 4 and light intensity regulating unit 5 are fixed at transient pulse light source 3 and photovoltaic cell device to be measured
In optical path between part, light path control switch 4 is used to cut off or be connected to the irradiation of transient pulse light, and light intensity regulating unit 5 is used for
The light intensity of transient pulse light source 3 is adjusted, so that a small amount of photo-generated carrier of transient state of photovoltaic cell device to be measured excitation belongs to perturbation
Condition.
Voltage is constituted between photovoltaic cell device to be measured on transient signal acquisition and recording unit 6 and photovoltaic cell fixture 1
Test loop, photovoltaic cell device to be measured generates when for acquiring stable state light action in real time steady-state surface photovoltage variable signal and
The transient state photocurrent variable signal that transient pulse light action front and back photovoltaic cell device to be measured generates.
Computer 7 is used to adjust stable light source in real time according to steady-state surface photovoltage variable signal and transient state photocurrent variable signal
2 and transient pulse light source 3 light intensity, and record complete transient state photocurrent signal attenuation curve, realize full automatic data
It obtains.
In a preferred embodiment, stable light source 2 includes pressure stabilizing/or constant-current supply 21 and LED light 22, LED light
22 electrical connection pressure stabilizings/or constant-current supply 21, pressure stabilizing/or constant-current supply 21 pass through RS-232 serial ports connection computer 7, computer 7
Pressure stabilizing/or constant-current supply 21 are controlled as the power supply of LED light 22；Alternatively, stable light source 2 can use the continuous semiconductor of process control
Laser, continuous semiconductor laser connect computer 7 by RS-232 serial ports.
In a preferred embodiment, transient pulse light source 3 can use semiconductor laser or high speed LED light, lead to
Cross USB port connection computer 7.
In a preferred embodiment, light path control switch 4 can be using high-speed shutter or mechanical electric guard board, high speed
Shutter or mechanical electric guard board are also electrically connected computer 7.
In a preferred embodiment, light intensity regulating unit 5 includes turntable, 1/2 wave plate and Glan prism, turntable
Top is fixedly connected with 1/2 wave plate.It is solid between turntable and photovoltaic cell device to be measured in the optical path of transient pulse light source 3
Surely it is provided with Glan prism, the transient pulse light that transient pulse light source 3 issues is by 1/2 wave plate adjustment polarization, by Glan prism
It is irradiated to photovoltaic cell device to be measured after carrying out light intensity attenuation, turntable also connects computer 7 by USB port；Alternatively, light intensity tune
Variable optical attenuator can be used by saving unit 5, and fibre optic attenuator is located in the optical path of transient pulse light source 3, and variable optical attenuator passes through
USB port connects computer 7.
In a preferred embodiment, transient signal acquisition and recording unit 6 can be obtained using digital oscilloscope or data
Card taking connects computer 7 through ICP/IP protocol by LAN mouthfuls.
In a preferred embodiment, parameter setting module, stable light source adjustment module, wink are provided in computer 7
State light-pulse generator adjustment module and data processing module.
Parameter setting module is used to preset the limit, maximum steady state criterion and perturbation of photovoltaic cell device to be measured
Condition, the scanning range and scanning gradient of steady-state surface photovoltage and the window parameter of transient signal acquisition and recording unit 6 etc. are joined
Number, and the limit of photovoltaic cell device to be measured and maximum steady state criterion are sent to stable light source adjustment module, it will be to be measured
The perturbation condition of photovoltaic cell device is sent to transient pulse light source adjustment module, by the maximum steady state of photovoltaic cell device to be measured
The window parameter of criterion, the scanning range of steady-state surface photovoltage and scanning gradient and transient signal acquisition and recording unit 6 is sent to
Data processing module.
Stable light source adjustment module acquires note for controlling opening or closing for stable light source 2, and according to transient signal
Steady-state surface photovoltage variable signal and preset limit that record unit 6 acquires in real time adjust the light intensity of stable light source 2, so as to
It surveys the steady-state surface photovoltage signal that photovoltaic cell device generates and meets preset limit.
Transient pulse light source adjustment module is used to control the unlatching of transient pulse light source 3, and is acquired and remembered according to transient signal
The transient state photocurrent variable signal and preset perturbation condition that record unit 6 acquires in real time, send a signal to light path control respectively and open
4 and light intensity regulating unit 5 are closed, being shut on or off for transient pulse light source 3 is controlled by light path control switch 4, passes through light intensity tune
The light intensity that unit 5 adjusts transient pulse light source 3 is saved, so that the transient state photocurrent signal that photovoltaic cell device to be measured generates meets in advance
If perturbation condition.
Transient state photocurrent amplitude that data processing module is used to be acquired according to transient signal acquisition and recording unit 6, transient state light
The time required to voltage attenuation 90%~100% and preset window parameter judges what transient signal acquisition and recording unit 6 acquired
Whether transient state photocurrent signal attenuation curve is complete, if transient state photocurrent signal attenuation curve is complete, according to preset to be measured
The maximum steady state criterion of photovoltaic cell device and the scanning range of steady-state surface photovoltage and scanning gradient, obtain transient signal acquisition
The all complete transient state photocurrent signal attenuation curve that recording unit 6 records, completes the full-automatic testing of transient state photocurrent.
As shown in Fig. 2, it is based on above-mentioned photovoltaic solar cell transient state photocurrent full-automatic test system, the present invention also provides
A kind of photovoltaic solar cell transient state photocurrent full-automatic testing method uses perovskite light below with photovoltaic cell device to be measured
Battery is lied prostrate, stable light source 2 uses regulated power supply 21 and LED light, and transient signal acquisition and recording unit 6 uses digital oscilloscope for tool
Body embodiment is described in detail:
1) perovskite photovoltaic cell to be measured is fixed on photovoltaic cell fixture 1, control regulated power supply 21 exports electricity
Lightening LED lamp 22 is pressed, light path control switch 4 is opened, the optical path for adjusting stable light source 2 and transient pulse light source 3 makes steady-state light
Hot spot be overlapped with the hot spot of transient pulse light on perovskite photovoltaic cell to be measured, and just by perovskite photovoltaic cell to be measured
Cathode is corresponding to digital oscilloscope to be connected, wherein the sampling coupling resistance of digital oscilloscope selects 1M Ω.
2) as shown in figure 3, preset the limit of perovskite photovoltaic cell to be measured in transient state photocurrent test process,
Maximum steady state criterion and perturbation condition and the scanning range of steady-state surface photovoltage and scanning gradient, specifically:
1. setting the limit of perovskite photovoltaic cell to be measured:
|Vph-V′ph| < 3mV
Wherein, VphFor the steady-state surface photovoltage variable signal that perovskite photovoltaic cell to be measured generates, V 'phIt, can for steady-state criterion
To be set according to actual needs.
2. setting the maximum steady state criterion of perovskite photovoltaic cell to be measured, i.e. setting steady-state criterion V 'phMaximum value be
1000mV or open-circuit voltage Voc, wherein open-circuit voltage VocIt is defaulted as 1V.
3. setting the scanning range of steady-state surface photovoltage as 0 to maximum steady state criterion, the scanning gradient of steady-state surface photovoltage is set
For 25mV, i.e., since 0V, every 25mV is a steady-state criterion, until limit V 'phReach maximum steady-state criterion or open circuit
Voltage Voc。
4. setting the perturbation condition of perovskite photovoltaic cell to be measured:
ΔVph< Vph* 5%
Wherein, Δ VphThe transient state photocurrent variable signal generated for perovskite photovoltaic cell to be measured.
3) light path control switch 4 is closed, (initial voltage of regulated power supply output can for the initial voltage of adjusting regulated power supply 21
To be set according to actual needs), steady-state light, which is irradiated to perovskite photovoltaic cell to be measured, makes it generate steady-state surface photovoltage signal
Vph, the steady-state surface photovoltage signal V of 6 pairs of transient signal acquisition and recording unit generationsphIt is acquired and is sent to computer 7.
4) computer 7 judges the steady-state surface photovoltage variable signal V that transient signal acquisition and recording unit 6 acquires in real timephWhether
Meet preset limit, if meeting limit, enters step 5)；If being unsatisfactory for limit, enters step and 3) change
The output voltage of regulated power supply 21.
5) it maintains the light intensity of stable light source 2 constant, opens light path control switch 4 and light intensity regulating unit 5, transient pulse light
The transient pulse light that source 3 issues is irradiated to perovskite photovoltaic cell to be measured after adjusting makes it generate transient state photocurrent signal delta
Vph, the transient state photocurrent signal delta V of 6 pairs of transient signal acquisition and recording unit generationsphIt is acquired and is sent to computer 7.
6) computer 7 judges the transient state photocurrent variable signal Δ V that transient signal acquisition and recording unit 6 acquires in real timephIt is
It is no to meet preset perturbation condition and entered step 7) if meeting perturbation condition；If being unsatisfactory for perturbation condition, enters step and 5) change
Become the light intensity of transient pulse light source 3.
7) it maintains the light intensity of stable light source 2 and transient pulse light source 3 constant, obtains transient signal acquisition and recording unit 6 and remember
The transient state photocurrent signal attenuation curve of record, transient state photocurrent amplitude V and transient state photocurrent decaying 90%~100% it is required
Time t, and set the window parameter of digital oscilloscope.
8) computer 7 judge obtain transient state photocurrent signal attenuation curve it is whether complete, if transient state photocurrent amplitude and
Transient state photocurrent decaying 90%~100% required time meet preset window parameter (such as: transient state photocurrent amplitude V is big
It is horizontal that 70% and 90%, the t less than digital oscilloscope vertical window in digital oscilloscope vertical window are less than digital oscilloscope
The 1/5 of window), then the transient state photocurrent signal attenuation curve obtained is complete, enters step 9)；If transient state photocurrent amplitude and wink
State photovoltage decaying 90%~100% required time be unsatisfactory for preset window parameter (such as: transient state photocurrent amplitude V is not
70% greater than digital oscilloscope vertical window, the 90% or t not less than digital oscilloscope vertical window is not less than digital oscillography
The 1/5 of device horizontal window), then the transient state photocurrent signal attenuation curve obtained is imperfect, enters step and 7) resets number
The window parameter of oscillograph.
9) complete transient state photocurrent signal attenuation curve under the scanning gradient is collected and recorded.
10) steady-state criterion V ' is successively changed according to the scanning gradient voltage 25mV of settingph, repeat step 3)~9) until steady
State criterion V 'phReach the 1000mV or open-circuit voltage V of maximum steady state criterionoc, collect and record all complete transient state photocurrents
Signal attenuation curve, as shown in figure 3, completing the full-automatic testing of transient state photocurrent.
As shown in figure 4, decaying by transient state photocurrent signal corresponding to institute's acquisition transient state photocurrent initial data of the invention
Curve, by carrying out exponential fitting acquisition to Carrier recombination (decaying of the transient state photocurrent signal) curve under different limits
Carrier lifetime, and map with corresponding steady-state surface photovoltage, obtain carrier lifetime as shown in FIG. 6-steady-state surface photovoltage relationship
Figure, it can be seen that under semilog coordinate, carrier lifetime and steady-state surface photovoltage approximately linear dependence, such as 200mV in Fig. 4
Shown in homologous thread, which will provide the photovoltaic cell device internal flaw state distribution correlation letter to be measured
Breath.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each component, connection type and manufacture craft etc. are all
It can be varied, all equivalents and improvement carried out based on the technical solution of the present invention should not exclude
Except protection scope of the present invention.
Claims (7)
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| CN110880913A (en) * | 2019-12-04 | 2020-03-13 | 西安航空学院 | A kind of dynamic testing device and testing method for photovoltaic cell device |
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