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Silver-aluminum paste for front electrode of high-sheet-resistance N-type solar cell and preparation method of silver-aluminum paste

A technology of solar cells and front electrodes, applied in the field of solar cells

Pending Publication Date: 2021-12-07
NANTONG T SUN NEW ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, glass frits in the above softening point range require special elements to be prepared, which increases the complexity of the process for preparing solar cells.

Method used

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  • Silver-aluminum paste for front electrode of high-sheet-resistance N-type solar cell and preparation method of silver-aluminum paste

Examples

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Effect test

preparation example Construction

[0047] Another aspect of the present invention, there is provided a high square resistance N-type solar cell with the front electrode silver-aluminum paste preparation process S100, and includes the following steps S110-S120:

[0048] S110, the powder dispersing treatment, to obtain the additive.

[0049] Specifically, the powder, a dispersant and a solvent and stirring the mixed process to the surface of the powder coating dispersant, additive was obtained. The dispersant is adsorbed to the surface of the powder selected electric double layer is formed, from the dispersion.

[0050] Incidentally, the powder of the present example comprises at least one single-phase mixture, the single-phase mixture of silicon, aluminum, zinc, bismuth, antimony, at least one element of boron and zirconium. That is, silicon, zinc, bismuth, antimony, boron and zirconium as an additive element powder particles to particles comprising one or more components of single-phase mixture or more elements, or...

Embodiment 1

[0058] In this example a high square resistance N-type solar cell with the front electrode silver-aluminum paste production method, comprising the steps of:

[0059] Sl, a silicon-containing aluminum powder, a mixed solvent containing a pigment dispersant groups of the copolymer and diethylene glycol butyl ether and treated with stirring, to the surface of the powder coating dispersant, additive was obtained.

[0060] S2, the 0.01wt% additive, 8wt% organic vehicle, 5.43wt% of glass frit, 0.56wt% of aluminum powder, 86wt% silver powder were mixed to obtain a high sheet resistance N-type solar cell with the front electrode silver aluminum pulp.

[0061] As shown in Table 1, the photoelectric conversion efficiency EFF silver-aluminum paste obtained in this example was 23.26%, the open-circuit voltage Voc of 0.6955V, as the short-circuit current Isc 11.2771A, fill factor was 81.22%, the shunt resistor Rsh is 3728.1Ω, series resistance 0.00231Ω.

Embodiment 2

[0063] In this example a high square resistance N-type solar cell with the front electrode silver-aluminum paste production method, comprising the steps of:

[0064] Sl, the solvent mixture containing zinc, boron, aluminum powder, highly branched structure of the polyester dispersant and polyoxymethylene dimethyl ether and treated with stirring, to cover the surface of the powder dispersing agent, to give additive.

[0065] S2, the 0.07wt% additives, 5wt% of organic vehicle, 3wt% of glass frit, 1.93wt% of aluminum powder, 90wt% silver powder were mixed to obtain a high sheet resistance N-type solar cell with the front electrode silver paste aluminum .

[0066] As shown in Table 1, the photoelectric conversion efficiency EFF silver-aluminum paste obtained in this example was 23.37%, the open-circuit voltage Voc of 0.6971V, as the short-circuit current Isc 11.2769A, fill factor was 81.52%, the shunt resistor Rsh is 2891.3Ω, series resistance 0.00187Ω.

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Abstract

The invention provides silver-aluminum paste for a front electrode of a high-sheet-resistance N-type solar cell and a preparation method of the silver-aluminum paste, and belongs to the technical field of solar cells. The silver-aluminum paste for the front electrode of the high-sheet-resistance N-type solar cell comprises the following components in percentage by weight: 80wt%-90wt% of silver powder; 0.5 wt% to 2 wt% of aluminum powder; 1 wt% to 6 wt% of glass powder; 1 wt% to 10 wt% of an organic vehicle; and 0.01 wt% to 2 wt% of an additive. According to the invention, by adding a proper amount of the additive, the damage of the glass powder to the PN junction can be effectively inhibited, so that the glass powder can corrode the SiNx layer on the surface of the silicon wafer and does not break down the PN junction, good ohmic contact is formed between metal and silicon, and the photoelectric conversion efficiency is further improved.

Description

Technical field [0001] The present invention belongs to the field of solar cell technology, particularly relates to a high-resistance N-type side electrode of the N-type front solar cell front electrode of a solar cell production method with a silver barrier aluminum paste and an aluminum paste with a high silver side. Background technique [0002] Factors influencing the efficiency losses of the solar cell are: a gate line masking factor, the gate line and the contact resistance factors and factors of recombination of carriers. In order to solve these loss factors, mainly the solution is: "high square resistance, shallow junction, high density," about to do high sheet resistance silicon, silicon PN junction closer to the front surface, a finer grid the number of the sub-battery slice width more many. [0003] Wherein, silicon sheet resistance is determined by the doping concentration, the higher the dopant concentration the lower the sheet resistance silicon, however, such high ...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00H01L31/0224
CPCH01B1/22H01B13/00H01L31/022425Y02E10/50
Inventor 毛平赵新沈昕
Owner NANTONG T SUN NEW ENERGY CO LTD
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