CN204315584U - A kind of solar battery sheet of novel electrode structure - Google Patents

Abstract

The utility model discloses a solar cell with a novel electrode structure, which comprises a cell front, a crystalline silicon chip and a cell back. Parallel sub-grid lines of grid lines, second thin grid lines distributed equidistantly from parallel sub-grid lines, and main grid lines perpendicular to sub-grid lines; new electrode design reduces shading area and increases light absorption rate; reduces SiNx burning Through the area, improve the passivation effect of the front surface, thereby increasing the current, opening voltage, and improving the overall conversion efficiency of the cell.

Description

A solar cell with a new electrode structure

technical field

The utility model relates to the field of photovoltaic solar cells, in particular to the design of a solar cell sheet with a novel electrode structure.

Background technique

With the continuous development of solar cell technology, the conversion efficiency of the cell cannot be improved. In order to further improve the efficiency, the improvement of silver paste seems to have come to an end. Looking at the electrode design in the past three years, the front electrode design of the battery is mostly improved on the thinner and denser grid lines.

Utility model content

Purpose of the utility model: Aiming at the deficiencies of the existing technology, the utility model provides a solar cell with a new electrode structure that reduces the shading area and increases the light absorption rate, thereby increasing the current and opening voltage.

Technical solution: A solar battery with a new electrode structure, including the front of the battery, a crystalline silicon wafer, and the back of the battery. The front of the battery is provided with first thin grid lines that are evenly spaced and connected The parallel sub-grid lines, the second thin grid lines connected to the parallel sub-grid lines at equal distances, and the main grid lines perpendicular to the sub-grid lines.

Specifically, the first thin grid line partially or completely penetrates through SiNx to form an ohmic contact, and the second thin grid line, sub-gate line, and main grid line do not penetrate through SiNx to contact the silicon substrate.

Specifically, the main grid line, the auxiliary grid line, and the second fine grid line are made of silver paste, copper, nickel or a combination of silver-copper-nickel with non-corrosive SiNx properties.

Specifically, the sub-gate line has a height of 5-30 μm and a width of 80-300 μm.

Specifically, the first fine grid line has a height of 5-30 μm and a width of 20-80 μm.

Specifically, the second fine grid line has a height of 5-30 μm and a width of 80-300 μm.

Specifically, the first thin grid line is formed by screen printing or inkjet printing.

Specifically, the main grid lines, the sub grid lines and the second fine grid lines are formed by screen printing, inkjet printing, thermal welding or electroplating.

Beneficial effects: Compared with the prior art, the utility model provides a solar cell structure with a new electrode structure. Through the new electrode structure, the burn-through area of the silver paste on SiNx is reduced, and the passivation effect of the front surface is improved, thereby achieving The purpose of increasing the opening pressure; at the same time reducing the printing cost of silver paste; it can also effectively reduce the shading area, increase the light absorption rate, and increase the current; thereby improving the overall conversion efficiency of the cell.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Figure 2 is a partial enlarged schematic view of Figure 1;

Fig. 3 is the structural representation of the first printed electrode pattern of the present utility model;

Fig. 4 is a structural schematic diagram of the second printing electrode pattern of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, further illustrate the utility model.

As shown in Figure 1-2, a solar cell with a new electrode structure includes main grid lines, auxiliary grid lines, first thin grid lines and second thin grid lines, the main grid line is one, and several The center points of the auxiliary grid lines parallel to each other are vertically intersected; each of the auxiliary grid lines is vertically intersected with the center points or ends of several first thin grid lines parallel to each other, and the first thin grid lines are in the middle of adjacent auxiliary grid lines There are gaps, and the first thin grid lines on adjacent sub-grid lines are staggered; two and four second thin grid lines are alternately arranged vertically between the adjacent sub-grid lines; the length of the second thin grid lines It is equal to the width between adjacent sub-gate lines.

The first thin grid line partially or completely penetrates SiNx to form an ohmic contact, and the second thin grid line, auxiliary grid line, and main grid line do not penetrate SiNx to contact with the silicon substrate; the main grid line, auxiliary grid line, and second thin grid line The material of the grid line is silver paste, copper, nickel or a combination of silver-copper-nickel with non-corrosion SiNx characteristics. The printing methods of the first fine grid line are mainly screen printing and inkjet printing; the printing methods of the main grid line, sub grid line and the second fine grid line are screen printing, inkjet printing, heat welding or electroplating, etc. Networking is the easiest way to achieve mass production.

The height of the auxiliary grid line is 5-30 μm, and the width is 80-300 μm; the height of the first thin grid line is 5-30 μm, and the width is 20-80 μm; the height of the second thin grid line is 5-30 μm, and the width is 80-300μm. The first thin grid line forms good ohmic contact with the silicon substrate to reduce contact resistance; the main grid line, auxiliary grid line, and second thin grid line only function to conduct current and collect current, and do not form ohmic contact with the silicon substrate.

The solar cell is printed with different electrode patterns on the front of the cell through two printings, and the solar cell is printed into an electrode pattern as shown in Figure 3 using non-burn-through paste PVD2A, and dried; The solar cell is printed again with the electrode pattern shown in Figure 4 using the fire-through paste Shuohe 590B, so that fine grid lines are formed on the solar cell, and then sintered after printing.

Claims (8)

1. the solar battery sheet of a novel electrode structure, comprise cell piece front, crystal silicon chip and the cell piece back side, it is characterized in that: described cell piece front is provided with equidistant the equally distributed first thin grid line, connect the parallel secondary grid line of the first thin grid line, connect the second thin grid line that parallel secondary grid line equidistantly distributes, and perpendicular to the main gate line of secondary grid line.

2. the solar battery sheet of a kind of novel electrode structure according to claim 1, it is characterized in that: the described first thin grid line local or all penetrate SiNx and form ohmic contact, the described second thin grid line, secondary grid line, main gate line do not penetrate SiNx and contact with silicon substrate.

3. the solar battery sheet of a kind of novel electrode structure according to claim 1, is characterized in that: described main gate line, secondary grid line, the second thin grid line material are the combination of the silver slurry of non-corrosive SiNx characteristic, copper, nickel or silver-bearing copper nickel.

4. the solar battery sheet of a kind of novel electrode structure according to claim 1, is characterized in that: described secondary grid line height is 5-30 μm, and width is 80-300 μm.

5. the solar battery sheet of a kind of novel electrode structure according to claim 1, is characterized in that: the described first thin grid line height is 5-30 μm, and width is 20-80 μm.

6. the solar battery sheet of a kind of novel electrode structure according to claim 1, is characterized in that: the described second thin grid line height is 5-30 μm, and width is 80-300 μm.

7. the solar battery sheet of a kind of novel electrode structure according to claim 1, is characterized in that: the described first thin grid line generation type is silk screen printing or inkjet printing.

8. the solar battery sheet of a kind of novel electrode structure according to claim 1, is characterized in that: described main gate line, secondary grid line and the second thin grid line generation type are silk screen printing, inkjet printing, hot weld or plating.