Heterojunction solar cell and preparation method and application thereof

Abstract

The invention provides a heterojunction solar cell and a preparation method and application thereof, and the preparation method comprises the steps: carrying out the polymerization of a combination of 3, 4-ethylenedioxythiophene and styrene sulfonic acid monomers on a silicon substrate provided with a transparent conductive layer as a monomer, and obtaining a high-molecular conductive film; and electrochemically depositing a tin-copper alloy layer on the polymer conductive film to form a metal grid line, thereby obtaining the heterojunction solar cell. According to the invention, the tin-copper alloy grid line is prepared by an electrochemical deposition process, so that the manufacturing cost is remarkably reduced, the metal grid line has better conductivity and stability, and an outer protective layer does not need to be arranged. According to the preparation method, a PEDOT: PSS polymer conductive film is formed in an in-situ polymerization mode, and the PEDOT: PSS polymer conductive film is used as a bonding layer of a transparent conductive layer and a metal grid line, so that the conductivity and the plating property can be effectively improved, the damage to TCO in laser etching is prevented, copper ions are prevented from migrating to the cell, and the comprehensive performance of the heterojunction solar cell is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a heterojunction solar cell and a preparation method and application thereof. Background technique [0002] Due to the non-renewable nature of traditional petrochemical energy and the atmospheric problems caused by its use, green and renewable energy has attracted more and more attention. Green and renewable energy includes solar energy, wind energy, water energy, etc., especially solar energy, is considered as an inexhaustible green energy. The collection of solar energy is mainly realized by solar cells, which convert the light energy of the sun into electricity to meet people's daily life. Solar cells have experienced rapid development since the advent of crystalline silicon cells. Current commercial cells can achieve a conversion efficiency of more than 24%, and future efficiency improvement technologies are also under continuous research and development. ...

AI Technical Summary

Problems solved by technology

This process method is simple and mature, and has been applied on a large scale; but there are also the following defects that cannot be ignored: (1) In order to sinter and form, glass phases are usually added to the silver paste, so the sintered silver grid electrodes are silver The porous continuous structure leads to a large volume resistance; (2) During the sintering process, silver will form a non-conductive reaction layer with the underlying silicon, which increases the contact resistance; (3) Screen printing has a negative effect on line width and There are certain requirements for the line height, limited by the size of the screen template, it is impossible to further reduce the line width of the grid line to increase the effective area of ​​the battery; (4) Silver is a noble metal, especially the low temperature used in heterojunction batteries. In terms of silver paste, the preparation of silver nanomaterials is still limited to imported products, resulting in very expensive low-temperature silver paste, which leads to an increase in battery costs and limits the large-scale application of batteries

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