Novel crystalline silicon solar cell and manufacturing method thereof

Abstract

The invention discloses a novel crystalline silicon solar cell. The novel crystalline silicon solar cell comprises a crystalline silicon matrix, wherein the front surface of the crystalline silicon matrix has an emitter structure, and the back surface of the crystalline silicon matrix has a heterojunction structure; the heterojunction structure comprises an intrinsically hydrogenated amorphous silicon film, a hydrogenated amorphous silicon film, a transparent conductive oxide film and a metal conductive electrode in turn; the intrinsically hydrogenated amorphous silicon film covers the entire back surface of the crystalline silicon matrix; the hydrogenated amorphous silicon film is heavily doped by using a dopant which has the same conduction type as that of the matrix; and the metal conductive electrode passes through the transparent conductive oxide film and is in ohmic contact with a heavily doped layer. The invention also discloses a manufacturing method of the crystalline silicon solar cell. The crystalline silicon solar cell with the structure can reduce composite loss on the surface; meanwhile, the back surface of the solar cell forms a better light trap structure to improve open-circuit voltage of the solar cell, so that conversion efficiency of the solar cell is improved.

Description

Technical field [0001] The invention is a photovoltaic technology field, which involves a new type of solar cell with high conversion efficiency and its production process. Background technique [0002] Photovoltaic technology is a technology that uses a large area of P-N diode to convert solar energy into electrical energy. This P-N diode is called solar cell.The semiconductor materials for making solar batteries have certain bandwidths. When solar cells are radiated by solar batteries, photons that exceed the bandwidth of the bandwidth generate electronic cave pairs in the solar cell.The asymmetric determines the flow direction of different types of photochemicals, and the power can be output to the outside through the external circuit connection.This is similar to ordinary electrochemical battery principles. figure 1 Gives the basic structure of a P-crystal silicon solar cell. [0003] The highest theoretical conversion efficiency of solar batteries formed by a single P-N junc...

AI Technical Summary

Problems solved by technology

[0005] However, for a monocrystalline silicon solar cell in which metal is directly deposited on the back of the substrate, the surface recombination on the back of the cell will reduce the density of minority carriers near the back surface, which limits the increase in the open circuit voltage of the cell.

Inserting a heavily doped back field between the absorber layer and the metal layer creates a potential barrier for photogenerated carriers, preventing the diffusion of photogenerated electrons, which helps to reduce the surface recombination rate to a certain extent, but for the entire surface For silicon wafers with metal contact areas, this method has limited effect

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