A kind of solar cell and preparation method based on multi-section nanowire radial pn junction

Abstract

The invention discloses a solar cell based on multi-joint nano wire radial pn nodes, and the solar cell is characterized by comprising radial pn nodes, a heavily doped tunnel node, dielectric films, a substrate, a transparent electrode and a back electrode, wherein each radial pn node comprises a nano wire and a shell layer, the shell layer is arranged on the outer side of the nano wire, and at least two radial pn nodes are arranged and are lined along the axial direction of the nano wire; the band gap width of the material of the radial pn node of a previous joint is larger than that of the material of the radial pn node of a next joint; the heavily doped tunnel node is arranged between two joints of radial pn nodes; the dielectric films are wrapped on the outer sides of the radial pn node and the heavily-doped tunnel node; the substrate is arranged on the bottom layer of a device; the transparent electrode is arranged on the top layer of the device; and the back electrode is arranged on the bottom surface of the substrate. According to the technical scheme provided by the invention, the high conversion efficiency of the radial pn nodes of the nano wire and the advantages of a plurality of joints of absorption spectrums with wide structures in the axial direction are fully integrated, so that the performance of the device is further improved.

Description

technical field [0001] The invention relates to the technical field of nano-engineering and nano-material application, in particular to a solar cell based on a radial pn junction of multi-section nanowires and a preparation method thereof. Background technique [0002] As a clean and renewable energy source, solar cells have attracted extensive attention in recent years. Due to its direct band gap, III-V semiconductor materials have higher photoelectric conversion efficiency, which has obvious advantages over traditional silicon thin film materials. In addition, connecting materials with different band gaps in series to form multiple solar cells can further expand the absorption range of the spectrum and achieve extremely high conversion efficiency. At present, the conversion efficiency of multi-junction thin-film material III-V solar cells is close to 40% [MartinA.Green, et al., Prog.Photovolt:Res.Appl.2012;20:12-20]. However, the crystalline quality of multi-node structu...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a solar cell based on a multi-section nanowire radial pn junction and a preparation method to solve the problem that the nanowire axial multi-section solar cell and the nanowire radial multi-section solar cell in the prior art cannot be further improved performance problem

Images