Two-dimensional silicon-based photonic crystal solar battery

Abstract

The invention belongs to the field of a solar battery technology, and relates to a two-dimensional silicon-based photonic crystal solar battery. The lower side surface of a front contact layer is provided with a front electrode; a honeycomb-like solar battery structure is arranged between the front electrode and a back electrode, the upper layer of the honeycomb-like solar battery structure is an N-type silicon semiconductor layer, the lower layer of the honeycomb-like solar battery structure is a P-type silicon semiconductor layer, and the N-type silicon semiconductor layer and the p-type silicon semiconductor layer form a PN junction; the bottom of the back electrode is provided with a back contact layer, and the material of the back contact layer is the same as the material of the front contact layer; the back electrode is arranged in a slow light area or a forbidden band area of the P-type silicon semiconductor layer, the shape of the back electrode is the same as the shape of the front electrode, and the front electrode and the back electrode are both strip-shaped; and incident light is irradiated on the honeycomb-like solar battery structure through the front contact layer. The two-dimensional silicon-based photonic crystal solar battery is regular in structure, high in flexibility and changeability and mature in processing and compounding technologies, thereby being a low-cost high-efficiency solar battery device with most potential of a new generation.

Description

Technical field: [0001] The invention belongs to the technical field of solar cells, and relates to a novel photonic crystal solar cell structure, in particular to a honeycomb cluster, hexagonal region division, small thickness, good structural characteristics, relatively wide forbidden band of photons, front electrode A two-dimensional silicon-based photonic crystal solar cell that is embedded along the segmented area, has less shading, has a certain slow light effect, and has high carrier-to-photonic conversion efficiency. Background technique: [0002] As a clean, pollution-free and inexhaustible energy source, solar energy is an important aspect of new energy development. The solar constant published by the World Meteorological Organization is 1367±4W·m -2 , the solar energy that reaches the earth's surface every year and is convenient for human use is about 1.9×10 22 J, these radiations are mainly concentrated in the visible region (400-750nm). Solar energy has been ...

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Problems solved by technology

[0010] The silicon dielectric column (or hole) structure is considered to be one of the solar cell device materials with the most potential for light trapping, but in the existing research, the nanostructures used are mostly one-dimensional structures, and the mechanism used is also to trap light through diffuse reflection. Some studies have proposed a two-dimensional structure of radial silicon nanowires, which has not been combined with the forbidden band and slow light theory of photonic crystal structure

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