Solar cell and preparation method thereof

Abstract

The invention is suitable for the technical field of solar cells, and provides a solar cell and a preparation method thereof, and the method comprises the steps: preparing grooves: forming a plurality of grooves in the back surface of a silicon substrate at intervals; preparing conducting regions: preparing a first conducting region in a target groove region through a hard mask, and preparing a second conducting region in a non-target groove region through a hard mask, wherein the first conducting region and the second conducting region comprise a passivation contact structure composed of a tunneling layer and a doping layer or a diffusion structure composed of the doping layer; preparing a dielectric layer: preparing a front dielectric layer on the front surface of the silicon substrate, and preparing a back dielectric layer on the back surface of the silicon substrate; and preparing conductive layers: preparing a first conductive layer on the back surface of the silicon substrate at a position corresponding to the first conductive region, and preparing a second conductive layer on the back surface of the silicon substrate at a position corresponding to the second conductive region. According to the solar cell preparation method provided by the invention, the problems of high control requirement on the width of the groove and poor preparation effect by adopting a hard mask in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a solar cell and a preparation method thereof. Background technique [0002] At present, in a conventional solar cell, the emitter contact electrode and the base contact electrode are respectively located on the front and back sides of the battery sheet. The front of the battery is the light-receiving surface, and the coverage of the metal emitter contact electrode on the front will inevitably cause a part of the incident sunlight to be reflected and blocked by the metal electrode, resulting in a part of optical loss. The back-contact solar cell is a battery in which both the emitter and base contact electrodes are placed on the back of the battery (non-light-receiving surface). The light-receiving surface of the battery is not blocked by any metal electrodes, thereby effectively increasing the short-circuit current of the cell. At the same time, the back side ca...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a solar cell manufacturing method, which aims to solve the existing problems of high requirements for groove width control and poor manufacturing effect of hard masks.

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