PN solar cell with transverse structure and manufacturing method for solar cell

Abstract

The invention discloses a PN solar cell with a transverse structure and a manufacturing method for the solar cell, and relates to a solar cell. The PN solar cell with the transverse structure comprises a substrate, wherein a groove is formed on the substrate; a semiconductor layer is formed in the groove through diffusion, epitaxy and the like; electrodes and an anti-reflection coating are evaporated on the semiconductor layer respectively; and a back electrode is evaporated at the bottom of the semiconductor layer. When the substrate is a p-type semiconductor layer, the semiconductor layer is an n-type semiconductor layer; when the substrate is the n-type semiconductor layer, the semiconductor layer is the p-type semiconductor layer. By adopting a transverse p-n junction parallel to a surface, namely a structure where a built-in electric field is parallel to the surface, photon-generated carriers only do drift motion in the transverse structure and do not need to do diffusion motion. On the premise that full light absorption in a space charge region is guaranteed, the drift distance of the photon-generated carriers can be greatly shortened due to the transverse structure, the requirement of the cells on the purity of silicon materials is greatly reduced, and the material cost of silicon solar cells can be dramatically reduced.

Description

technical field [0001] The invention relates to a solar cell, in particular to a PN solar cell with a lateral structure and a preparation method thereof. Background technique [0002] Solar energy is an inexhaustible renewable and clean energy source. The energy that the sun shines on the earth for one hour is equivalent to the world's total energy consumption for one year. The effective use of solar energy has become the consensus of mankind. As one of the important means of solar energy utilization, the research and development of solar cells, namely photovoltaic power generation, has become increasingly important. At present, solar cells are mainly based on silicon-based solar cells, and more than 89% of the photovoltaic market is occupied by silicon-based solar cells. The research and development of silicon-based solar cells has been widely valued. Among the silicon series solar cells, the monocrystalline silicon solar cells have the highest conversion efficiency and th...

AI Technical Summary

Problems solved by technology

Therefore, the current monocrystalline silicon cell with this commonly used structure has a small spectral response in the short-wave band, which hinders the further improvement of cell conversion efficiency.

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