CN1983644A

CN1983644A - Production of monocrystalline silicon solar battery suede

Info

Publication number: CN1983644A
Application number: CNA2005101114532A
Authority: CN
Inventors: 汪乐
Original assignee: Shanghai Solar Energy Science and Technology Co Ltd
Current assignee: Shanghai Solar Energy Science and Technology Co Ltd
Priority date: 2005-12-13
Filing date: 2005-12-13
Publication date: 2007-06-20

Abstract

The invention is concerned with a kind of production method for the textured single crystal silicon solar cell. Input single crystal silicon into alkaline eroded solution and the solution is mixed liquor made up by NaOH, alcohol and grape sugar. And the concentration of NaOH is 0.5-1.5%, the concentration of grape sugar is 1-5%, and NaOH solution: alcohol: grape sugar solution is (9-11) : 1 : ( 0.01-0.02), and the eroded temperature is 85 centigrade and the time is 30-45 minutes. The textured surface (positive pyramid) made by this method is small and symmetrical on the whole surface. The peak of pyramid is clear with low surface reflectivity about 8% and advances the short circuit current of cell and the photoelectric translation efficiency. It is fit for producing solar cell with large area, such as 125x125 mm2 and 56x156 mm2.

Description

Make the method for monocrystalline silicon solar battery suede

Technical field

The present invention relates to a kind of technology of utilizing monocrystalline silicon to prepare solar cell, be specifically related to a kind of preparation method of monocrystalline silicon solar battery suede.

Background technology

Solar cell can be transformed into electric energy with solar energy.In order to reduce the monocrystalline silicon surface reflection of light, increase the absorption of light, when making single crystal silicon solar cell, the silicon single crystal surface is made the positive tetrahedron of " positive pyramid " or " inverted pyramid " shape with chemical method or physical method.Wherein large-scale production of chemical method optimum and cost are lower.Therefore the enterprise of produce single crystal silicon solar cell generally all reaches the purpose of improving surface texture (being commonly called as " making matte ") by selective corrosion both at home and abroad.At present, all adopt N basically _aThe OH aqueous solution adds a certain amount of alcohol at a certain temperature or isopropyl alcohol is realized as buffer.Wherein isopropyl alcohol is than the better effects if of alcohol, and quality is more stable, but cost is higher.Chinese patent CN1507075A also discloses a kind of " surface texture of monocrystaline silicon solar cell and preparation method thereof " on 06 23rd, 2004, and solar battery surface utilizes N _aOH solution and aqueous isopropanol carry out anisotropic etch, make pyramid figure (positive tetrahedron), increase the sunlight absorbing surface, through repeatedly reflection, increase monocrystalline silicon surface and absorb.

Though the enterprise of domestic most of produce single crystal silicon solar cells all adopts alcohol to make buffer.But, the alcohol of the monocrystalline silicon of different lot numbers or different lot numbers often, the amount that adds alcohol when making matte is all different with Production Time.Like this, increased workman's the specification requirement and the unsteadiness of the quality of production.In addition, bubble is difficult for driving away in manufacturing process, occurs on the surface in many " raindrop " or " bright spot ".Promptly locate at " raindrop ", silicon face and solution is fully reaction not, at this place not form " pyramid ".Therefore, be necessary to seek and a kind ofly both reduced cost, improve " matte " quality and stability, make the easy to operate making of workman " matte " method again.

Summary of the invention

The purpose of this invention is to provide and a kind ofly both reduced cost, improve the method for the making monocrystalline silicon solar battery suede of " matte " quality and stability again.This method can reduce the formation of " raindrop ", under the situation of using static operation, produces the equally distributed pyramid of basic maintenance pinnacle of a pagoda, and anti-reflective effect is splendid.

In order to realize the foregoing invention purpose, a kind of method of making monocrystalline silicon solar battery suede that the present invention proposes on the basis of the silicon face of original NaOH and alcoholic solution anisotropic etch (100) direction, increases a kind of additive.Additive is the hydroxylated material that is different from alcohol and isopropyl alcohol, and promptly concentration is the glucose solution of 1-5%.Concrete technical scheme is: monocrystalline silicon is inserted in the caustic corrosion solution, this caustic corrosion solution is the mixed aqueous solution of NaOH, alcohol and glucose, wherein, the concentration of NaOH is 0.5-1.5%, the concentration of glucose is 1-5%, NaOH solution: alcohol: glucose solution=(9-11): 1: (0.01-0.02); Corrosion temperature is 85 ℃, and etching time is 30-45 minute, and aforementioned proportion is a volume ratio.

The inventive method adds additive in caustic corrosion solution, it can reduce the alcohol use amount can to make manufacturing process remain on inactive state, saves cost; Prepare the pyramid, stay-in-grade " matte " that keep most advanced and sophisticated, the matte quality is better than existing additive method, as depicted in figs. 1 and 2.Reach the battery surface reflectivity and reduce, the purpose that battery efficiency improves.Through detecting, the monocrystalline silicon solar battery suede reflectivity that uses the present invention to make reaches about 8%, is better than the reflectance value that other solution corrosion is made matte.Characteristics such as matte (pyramid) is little and even, covers whole surface, and the pyramid pinnacle of a pagoda is clear, and the matte reflectivity is low.Be fit to large tracts of land, as 125 * 125mm ²With 156 * 156mm ²The production of solar cell is used.

Description of drawings

Fig. 1 is to use the SEM profile of the matte silicon chip of the inventive method making;

Fig. 2 is to use certain angle of the matte silicon chip of the inventive method making to overlook SEM figure.

Embodiment

Below in conjunction with drawings and Examples the present invention is described in further detail.

Embodiment 1

1, configuration caustic corrosion solution

2, monocrystalline silicon piece is under about 85 ℃, and dropping into concentration is to carry out reduction processing in the 20%NaOH solution, and the processing time is 5-10 minute, removes surface damage layer.

3, in pure water, wash, remove surface residue.

4, the silicon chip after the reduction processing is placed the solution of the making matte that has disposed, corrosion is 30-45 minute under 85 ℃ of left and right sides temperature.

5, in pure water, wash, remove surface residue.

Claims

1, a kind of method of making monocrystalline silicon solar battery suede, it is characterized in that monocrystalline silicon is inserted in the caustic corrosion solution, this caustic corrosion solution is the mixed aqueous solution of NaOH, alcohol and glucose, wherein, the concentration of NaOH is 0.5-1.5%, the concentration of glucose is 1-5%, NaOH solution: alcohol: glucose solution=(9-11): 1: (0.01-0.02); Corrosion temperature is 85 ℃, and etching time is 30-45 minute, and aforementioned proportion is a volume ratio.