Manufacturing method of N type all-aluminum back emitter solar cell and solar cell prepared by the same

Abstract

The invention discloses a manufacturing method of an N type all-aluminum back emitter solar cell and a solar cell prepared by the same. The manufacturing method comprises: providing an N type semiconductor substrate, removing a surface damage layer, and preparing a surface pile face; carrying out phosphorus diffusion to form an n<+> doping layer and etching and removing the parts, formed at the edge and the back, of the n<+> doping layer; preparing an antireflection layer at the front side; printing a back aluminium paste and carrying out sintering to form a full-area aluminum back emitter; carrying out etching at the back and removing the aluminium paste and keeping the aluminum back emitter; preparing a back passivation layer at the back; printing a front electrode silver paste and carrying out drying, printing a back electrode silver-aluminium paste and carrying out drying, and carrying out sintering to form electrode ohmic contact. According to the invention, a problem of leak current existence at the boundary of the local back aluminium emitter and the back silver electrode can be solved; the solar cell quality is improved; and the conversion efficiency is improved by increasing the effective area of the PN node. With the back passivation layer, the open-circuit voltage and short-circuit current of the cell are increased. Moreover, the dual-face solar cell can be manufactured, so that the cell energy output is enhanced and the conversion efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for making an N-type all-aluminum back-emitter solar cell that improves the conversion efficiency of a traditional aluminum back-emitter solar cell and the solar cell prepared by the method. Background technique [0002] A solar cell is a semiconductor device that converts the sun's light energy directly into electrical energy. Because it is a green product, does not cause environmental pollution, and uses renewable resources, solar cells have broad prospects for development in today's energy shortage situation. [0003] There are various types of solar cells, among which, N-type solar cells have attracted more and more attention from people in the industry because of their high conversion efficiency. The "boron-oxygen pair" of the P-type silicon substrate will cause the problem of efficiency attenuation, but the use of the N-type silicon substrate does not have thi...

AI Technical Summary

Problems solved by technology

Aluminum back-emitter solar cells have low process cost, simple operation, and are easy to realize industrialization; however, the cells made by conventional aluminum back-emitter cells are formed during the sintering process, so the back surface The aluminum back emitter 104 is not a full back field, and the PN junction with the back silver electrode 106 is easily damaged, thereby easily forming a leakage current. The existence of this leakage leads to a significant decrease in battery efficiency; in addition, the aluminum back emitter 104 does not cover the positive There is a back side, so that the back side is not an all-aluminum back emitter, and there is no PN junction at the back silver electrode, and the effective area of ​​the PN junction is relatively small, so the efficiency is also low.

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