Solar cell, preparation method thereof, and solar cell module comprising solar cell

Abstract

The invention provides a solar cell, which comprises a silicon substrate sheet, a conductive layer covering the front surface of the silicon substrate sheet, a copper front electrode arranged on the surface of the conductive layer, a back surface field arranged on the back face of the silicon substrate sheet, and a back electrode conducted with the back surface field, wherein the conductive layer is an aluminum-doped zinc oxide layer, a tin-doped indium oxide layer, an antimony-doped tin oxide layer or a tin dioxide layer. The invention also provides a solar cell preparation method and a solar cell module comprising the solar cell. The copper back electrode and the copper front electrode obtained by using the technology of the invention have good appearances, strength of welding between the electrodes and a photovoltaic welding strip and electric performance of the cell remain almost the same as those of a battery with silver electrodes prepared by the traditional technology, and in addition, as copper paste is adopted to replace the traditional silver paste, the cost of the cell is greatly reduced.

Description

technical field [0001] The invention belongs to the field of solar cells, and in particular relates to a solar cell sheet, a preparation method thereof, and a solar cell module containing the cell sheet. Background technique [0002] Crystalline silicon solar cells are the leading products in the photovoltaic market, and conductive paste is the main auxiliary material for making crystalline silicon solar cells. Conductive paste is the largest material cost item on the cell except for silicon materials. This type of paste is mainly made of mixed rolling of metal powder, inorganic glass powder, organic carrier, etc., and its types include silver paste on the glossy surface and silver paste on the backlight surface. paste, back electric field aluminum paste, etc. [0003] At present, the research on the conductive paste of crystalline silicon solar cells has the following directions, 1. In the preparation of high-performance paste to improve the photoelectric conversion effici...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem that copper atoms pass through the anti-reflection film layer and enter the N+ type silicon to form impurities and affect the performance of the silicon substrate sheet when the existing copper electrodes are used for solar cells, the present invention provides a special conductive layer The special conductive layer plays the role of anti-reflection and conductivity at the same time, and can prevent the copper atoms in the copper electrode from passing through the conductive layer and entering the silicon.