Manufacturing method for back contact type silicon solar cell

Abstract

The invention relates to a manufacturing method for a back contact silicon solar cell, which comprises the following steps of: (1) setting holes on the surface of silicon wafers, and etching textures on the light receiving surfaces of the silicon wafers; (2) diffusing on the light receiving surfaces of the silicon wafers to make junctions, and forming PN junctions in the light receiving surfaces, the peripheries and holes of the silicon wafers; (3) setting transparent conductive films on the PN junctions in the light receiving surfaces, the peripheries and holes of the silicon wafers; (4) etching the peripheries of the silicon wafers to remove the transparent conductive films and the PN junctions on the peripheries of the silicon wafers, and coating antireflection films on the transparent conductive films in the light receiving surfaces of the silicon wafers; and (5) preparing through hole electrodes, back metal electrodes and back passivation fields on the non film coated surfaces of the silicon wafers to obtain the back contact silicon solar cells. The light receiving surfaces of the back contact silicon solar cells are not covered with electrodes, so that the shading loss is avoided, and the photoelectric conversion efficiency is remarkably improved; holes to be arranged are also greatly reduced, so that the fragmentation rate is greatly reduced; and the manufacturing process is simplified.

Description

technical field [0001] The invention relates to a method for preparing a back-contact silicon solar cell, belonging to the field of crystalline silicon solar cell manufacturing. Background technique [0002] Conventional fossil fuels are being exhausted day by day. Among the existing sustainable energy sources, solar energy is undoubtedly the cleanest, most common and most potential alternative energy source. At present, among all solar cells, silicon solar cells are one of the solar cells that have been widely commercialized. This is due to the extremely abundant reserves of silicon materials in the earth's crust. With excellent electrical and mechanical properties, silicon solar cells occupy an important position in the field of photovoltaics. Therefore, developing cost-effective silicon solar cells has become one of the main research directions of photovoltaic companies in various countries. [0003] The power generation principle of silicon solar cells is based on the ...

AI Technical Summary

Problems solved by technology

Although this technology avoids the shading loss caused by the front electrode, in order to ensure that the current on the light-receiving surface is transmitted to the back without loss, tens of thousands of holes need to be set, and high-concentration doping needs to be formed in the holes. These conditions have led to its preparation. The process is very complicated and the cost is high; at the same time, too many holes also affect the mechanical strength of the device, and a large number of silicon wafers will be broken during production

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