Solar cell slice and fabrication method thereof

Abstract

The invention provides a solar cell slice and a fabrication method thereof. The solar cell slice comprises a silicon substrate slice, a positive-surface electrode on the front surface of the silicon substrate slice, a back electric field on the back surface of the silicon substrate and a back electrode electrically communicated with the back electric field, wherein the front surface of the silicon substrate slice comprises a non-antireflection film region, and the positive-surface electrode comprises a metal titanium layer arranged on the surface of the non-antireflection film region and a conductive metal layer arranged on the surface of the metal titanium layer. The positive-surface electrode is high in fine density, line broken is difficult to happen, the solar cell slice is difficult to strip and fall off, the resistance when the cells are connected in series is low, high fill factor is achieved, the photoelectric conversion efficiency of the cell is high, and the cost is low.

Description

technical field [0001] The invention relates to the field of solar cells, more specifically, the invention relates to a solar cell sheet and a preparation method thereof. Background technique [0002] As a kind of green energy, solar energy has attracted more and more attention due to its advantages of inexhaustibility, no pollution, and no limitation of geographical resources. Existing silicon-based solar cells generally prepare electrodes and back field by printing conductive paste containing conductive metal powder, glass powder and organic vehicle on a silicon substrate, drying and firing. The back electrode of the solar cell silicon substrate is generally the positive electrode, and the coated conductive paste is usually the back silver paste; the back surface is generally coated with an aluminum-containing conductive paste, which forms an aluminum back field after sintering, which can significantly increase the open circuit voltage of the battery and photoelectric con...

AI Technical Summary

Problems solved by technology

However, there are still many problems in the preparation and silk screen printing of the existing silver seed layer, which have affected its practical application. If the width increases too much, the shading area increases, causing the short-circuit current of the battery to decrease

[0004] At present, there are also methods to further reduce the cost, and the process of electroplating pure silver is improved to electroplating pure copper process, but in these processes, silver seed layer is formed by printing silver conductive paste, and the conductive paste contains solvent and organic binder. During the sintering process, solvents and organic binders are volatile when heated, which will leave tiny holes in the sintering residue. During the subsequent use of the battery, copper atoms may pass through the holes and come into contact with the silicon substrate, resulting in battery failure. The photoelectric conversion efficiency drops sharply, which affects the performance of the cell

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