A back-contact crystalline silicon solar cell, its preparation method, component, and system

Abstract

The invention relates to a back contact crystalline silicon solar cell, a preparation method, a component and a system. The back contact crystalline silicon solar cell provided by the invention comprises a N type crystalline silicon substrate, wherein a front surface oxide layer, a front surface n+ doped polycrystalline silicon layer and a front surface antireflection coating are successively arranged on the front surface of the N type crystalline silicon substrate from inner to outer; a rear surface p+ doped area, a rear surface n+ doped area, a rear surface passivation coating and a rear surface metal electrode which are alternately arrayed are successively arranged on the rear surface of the N type crystalline silicon substrate from inner to outer. The back contact crystalline silicon solar cell has the beneficial effects that the n+ doped polycrystalline silicon layer is taken as a front surface field of the back contact crystalline silicon solar cell, an excellent field passivation effect is supplied to the surface of the N type crystalline silicon substrate, the compound of minority carriers on the front surface is reduced, the open-circuit voltage and short-circuit voltage of the back contact crystalline silicon solar cell are increased and the energy exchange efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a back-contact crystalline silicon solar cell, a preparation method, an assembly, and a system. Background technique [0002] A solar cell is a semiconductor device that converts light energy into electrical energy. Lower production costs and higher energy conversion efficiency have always been the goals pursued by the solar cell industry. For conventional solar cells, the p+ doped region contact electrodes and the n+ doped region contact electrodes 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 contact electrodes on the front will inevitably cause a part of the incident sunlight to be blocked and reflected by the metal electrodes, resulting in a part of optical loss. The coverage area of ​​the front metal electrode of an ordinary crystalline silicon solar cell ...

AI Technical Summary

Problems solved by technology

In the prior art, the surface concentration of the front surface field obtained by diffusion by depositing a phosphorus source on the surface of the silicon wafer is generally 1E 19 cm -3 above, it is difficult to get a lower J 0 value

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