PERC crystalline silicon solar cell back silver paste and preparation method and application thereof

A technology of solar cells and crystalline silicon, applied in the field of solar cells, can solve the problems of unsatisfactory electrical properties of the cells, silver paste cannot guarantee welding tension, etc., and achieve good photoelectric conversion efficiency

Inactive Publication Date: 2021-01-12
GUANGZHOU RUXING TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the silver paste disclosed in the prior art cannot guarantee a stable welding tension, and the electrical performance of the prepared battery is not satisfactory.

Method used

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  • PERC crystalline silicon solar cell back silver paste and preparation method and application thereof
  • PERC crystalline silicon solar cell back silver paste and preparation method and application thereof
  • PERC crystalline silicon solar cell back silver paste and preparation method and application thereof

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Embodiment Construction

[0019] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific examples.

[0020] Embodiments 1 to 5 are all silver pastes of the present invention, and comparative examples 1 to 3 are different from the silver pastes of the present invention for the silver powder used in the preparation of silver pastes. The formula of the above silver pastes is as shown in Table 1. The performance parameters are shown in Table 2. Wherein, the formula of the organic carrier in the embodiment and the comparative example is: 2 parts of modified epoxy resin, 8 parts of ethyl cellulose, 22 parts of diethyl phthalate, 18 parts of diethylene glycol butyl ether acetate, 20 parts of tributyl citrate and 25 parts of butyl oxalate; the formula of the inorganic binder is: SiO 2 9 parts, H 3 BO 3 25 parts, V 2 o 5 10 parts, PbO 10 parts, ZnO 15 parts, ZrO 2 1 part a...

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Abstract

The invention discloses PERC crystalline silicon solar cell back silver paste and a preparation method and application thereof, and belongs to the technical field of solar cells. The silver paste is prepared from silver powder, an inorganic adhesive, an organic carrier, a dispersing agent and an auxiliary agent, the tap density of the silver powder is 3-5 g / m < 3 >, the apparent density of the silver powder is 1.5-3 g / m < 3 >, the specific surface area of the silver powder is 1-2.5 m < 2 > / g, and the particle size of the silver powder is 0.5-2 micron. A crystalline silicon solar cell using thesilver paste on the back surface has relatively high welding tension and photoelectric conversion efficiency, and the silver paste is suitable for practical application.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a silver paste on the back of a PERC crystalline silicon solar cell and a preparation method and application thereof. Background technique [0002] The back point contact structure crystalline silicon solar cell is also called local aluminum back field or rear passivation, referred to as LBSF or PERC (passivation emitter rear contact) cell, which is a high-efficiency cell that is easy for industrialization. Compared with conventional batteries, the back of this type of battery is coated with a passivation film, and the passivation film is perforated or grooved by laser or other means. Burned silver paste (back silver paste) is used as the back electrode, and the photoelectric conversion efficiency of this single crystal cell can reach 22.7%. [0003] Silver paste on the back of PERC crystalline silicon solar cells is a slurry with certain functions formed by unif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
CPCH01B1/22H01L31/022425Y02E10/50
Inventor 丁冰冰孙倩刘建彬黄铭
Owner GUANGZHOU RUXING TECH DEV
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