Back contact heterojunction solar battery

Abstract

The invention relates to a solar battery, in particular to a back contact heterojunction solar battery, comprising a transparent conducting film TCO, a P-a-Si amorphous silicon film, an i-a-Si intrinsic amorphous silicon film, an N-C-SiN type crystalline silicon, an i-a-Si intrinsic amorphous silicon film, an N-a-SiN type amorphous silicon film, a penetrative type back electrode and a back electrode which are overlapped in sequence from top to bottom. The solar battery can avoid the photoconduced attenuation phenomenon of the conventional P-type crystalline silicon solar battery, the back contact electrode reduces the contact resistance, and effectively reduces the shading ratio of a light-receiving surface, thereby increasing the current collection rate and improving the conversion efficiency of the solar battery; as the temperature coefficient is low, the back contact heterojunction solar battery is suitable for a high temperature environment; and the low-temperature process simplifies the production process greatly and reduces the production cost, so that the back contact heterojunction solar battery is suitable for industrial development.

Description

technical field [0001] The invention relates to a solar cell, in particular to a back contact heterojunction solar cell. Background technique [0002] In the 21st century, energy crisis and environmental pollution have become global problems that need to be solved urgently. The development of safe green energy has become the main method to solve the crisis. Among them, solar cells have become the goal of competing development of countries all over the world because of their cleanliness, safety and renewability. At present, the main development direction of solar cells is to reduce costs and increase efficiency. [0003] The heterojunction solar cell composed of new amorphous silicon and crystalline silicon has a simple structure and simple process. It combines the advantages of high carrier mobility of crystalline silicon with the advantages of low-temperature chemical vapor deposition of amorphous silicon technology, and has become the leading solar cell in the solar indu...

AI Technical Summary

Problems solved by technology

[0004] The solar cells with the above-mentioned HIT structure have the following problems: the first amorphous silicon film has many defects, which increases the carrier recombination defect density in the film body and affects the collection and transmission of photo-generated current; The light-receiving area is reduced, thereby reducing the short-circuit current and affecting the final conversion efficiency of the solar cell

The contact resistance of the third metal grid line is too large

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