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Preparation method for silver tellurite, crystalline solar cell positive pole silver paste and preparation method therefor

A technology of solar cells and silver tellurite, which is applied in the field of solar cells, can solve problems such as PN junction damage, and achieve the effects of low contact resistance, high conversion efficiency and exquisite design

Inactive Publication Date: 2016-08-17
SUZHOU KAIYUAN MINSHENG SCI & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in order to effectively ensure the ohmic connection of silver-silicon, there must be sufficient energy in the overshoot of sintering, which requires a high temperature of nearly 800°C, and it is a great challenge to keep the integrity of the PN junction from being damaged, that is, High temperature will damage the PN junction. In general, the higher the temperature, the greater the probability of damage to the PN junction. Therefore, how to solve the contradiction between the high temperature requirement for silver-silicon ohmic contact and the low temperature requirement for the integrity of the PN junction becomes research questions

Method used

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preparation example Construction

[0036] Further, the present invention also discloses a method for preparing a positive electrode silver paste for a crystalline silicon solar cell, which includes the following steps:

[0037] S1, silver tellurite preparation steps: prepare silver tellurite according to the following steps:

[0038] S11, the step of generating tellurite: reacting tellurium oxide with XOH solution to produce tellurite, wherein X is K or Na; the mass fraction of the XOH solution is 2-5%, preferably 4%, and the The molar ratio of tellurium oxide to sodium hydroxide or potassium hydroxide is 1:2.

[0039] Taking NaOH as an example, its reaction equation is as follows:

[0040] TeO 2 +2NaOH==Na 2 TeO 3 +H 2 O.

[0041] S12, silver ammonia solution generation steps:

[0042] First, inject a small amount of sodium hydroxide solution into the test tube, oscillate, then heat to boil, pour out the sodium hydroxide, and then wash it with distilled water for later use.

[0043] Preparation of solu...

Embodiment 1

[0053] Preparation of organic vehicle: according to the ratio of ingredients: ethyl cellulose 3wt%, thixatrol st5wt% thixatrol, alcohol ester twelve 60wt%, butyl carbitol acetate 20wt%, butyl carbitol 12wt% ratio, add Stir in the container and raise the temperature to 75°C and keep it warm for 2 hours.

[0054] Mix 87wt% of silver powder, 10wt% of organic carrier, 2wt% of high selectivity corrosion glass powder, and 1wt% of silver tellurite to make a paste, roll and grind it with a three-roller until the fineness is less than 10 μm, and the viscosity is 200-250mpa·s, the solar cell front silver paste was prepared as a comparison paste.

Embodiment 2

[0056] Preparation of organic vehicle: according to the ratio of ingredients: ethyl cellulose 3wt%, thixatrol st5wt% thixatrol, alcohol ester twelve 60wt%, butyl carbitol acetate 20wt%, butyl carbitol 12wt% ratio, add Stir in the container and raise the temperature to 75°C and keep it warm for 2 hours.

[0057] According to the ratio of 88wt% of silver powder, 10wt% of organic carrier, and 2wt% of high selectivity corrosion glass powder, they are mixed evenly, adjusted into a paste, rolled and ground with a three-roller until the fineness is less than 10 μm, and the viscosity is 200-250mpa·s. Preparation Obtain the silver paste on the front side of the solar cell as a contrast paste.

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PUM

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Abstract

The invention discloses a preparation method for preparing silver tellurite through subjecting a silver ammonia solution to a reaction with tellurite as well as provides novel crystalline solar cell positive pole silver paste by means of directly adding the silver tellurite prepared by the method and improved inorganic glass powder based on original raw materials and a method for preparing the crystalline solar cell positive pole silver paste. According to the invention, the design is ingenious; and through directly adding the silver tellurite and the high-selection-ratio corrosive inorganic glass powder, conditions are created for ohmic contact for silver and silicon, meanwhile, high-temperature conditions required for precipitating adequate silver tellurite from the glass powder are avoided, and the integrity of PN junctions cannot be affected by high temperatures, so that the contradiction is solved, and the window for sintering temperatures is widened.

Description

technical field [0001] The invention belongs to the field of solar cells, and in particular relates to a preparation method of silver tellurite, a positive electrode silver paste of a crystalline solar cell containing the above silver tellurite and a preparation method of the silver paste. Background technique [0002] Solar energy is an inexhaustible and inexhaustible clean energy. Solar power generation is the direct conversion of solar radiation energy into electrical energy. It is the most direct way to convert solar energy with the fewest conversion links among all clean energy sources. [0003] At present, crystalline silicon solar cells are the main solar cells, and the front silver paste of crystalline silicon solar cells is used as the positive electrode of the cell, which is an important part of the cell, and its composition includes organic carrier, silver powder and inorganic glass. At present, the standards for measuring the performance of silver paste include a...

Claims

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Application Information

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IPC IPC(8): C01B19/00H01B1/16H01B1/22H01B13/00
CPCC01B19/008C01P2004/61H01B1/16H01B1/22H01B13/00H01L31/022425Y02E10/50
Inventor 余斌徐剑锋钱昆程晓文
Owner SUZHOU KAIYUAN MINSHENG SCI & TECH CORP
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