A kind of selective passivation contact structure of solar cell and double-sided solar cell

Abstract

The application is applicable to the technical field of solar cells, and provides a selective passivation contact structure of solar cells and double-sided solar cells. The selective passivation contact structure of the solar cell includes alternately arranged first passivation contact regions and second passivation contact regions; the first passivation contact region includes the first doped layer, the second A passivation layer and a second doped layer; the second passivation contact region includes a second passivation layer, a third doped layer and a third passivation layer which are sequentially stacked on the silicon substrate; the second doped layer The thickness is greater than the thickness of the third doped layer, and the doping polarities of the second doped layer and the third doped layer are the same. In this way, since the thickness of the third doped layer is small, the parasitic absorption of the second passivation contact region can be reduced, and the short-circuit current can be increased. At the same time, since the thickness of the second doped layer is relatively large, it can prevent the conductive layer from burning through the second doped layer and increase the open circuit voltage. In this way, the photoelectric conversion efficiency of the solar cell can be maximized.

Description

technical field [0001] The application belongs to the technical field of solar cells, and in particular relates to a selective passivation contact structure of a solar cell and a double-sided solar cell. Background technique [0002] The electricity generated by solar cells is a sustainable source of clean energy. Solar cells can convert sunlight into electrical energy by using the photovoltaic effect of semiconductor p-n junctions. Therefore, the photoelectric conversion efficiency is an important indicator to measure the performance of solar cells. In solar cells, the loss of photoelectric conversion efficiency includes two aspects of electrical loss and optical loss. The electrical loss mainly includes recombination loss and resistance loss caused by metal-semiconductor contact, while the optical loss mainly includes the shading of the metal grid line on the light receiving surface and the parasitic absorption of the front doped layer. [0003] The solar cell in the rela...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present application provides a selective passivation contact structure of solar cells and double-sided solar cells, aiming to solve the problem of how to reduce the parasitic absorption of solar cells

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