A kind of rare earth light-converting phosphor, preparation method of rare earth light-converting phosphor, silicon-based solar cell, solar power generation system

Abstract

The invention discloses a rare earth light-converting fluorescent powder. The general chemical composition formula of the fluorescent powder is (A1-xYbx)Ga2S4, wherein, A is one or more elements among Ca, Sr, and Ba; x is the number of moles , and 0.001≤x≤0.10. The present invention also discloses a preparation method of rare earth light-converting fluorescent powder, which includes the following steps: step 101, using A sulfide as the raw material of A element, Ga2S3 as the raw material of Ga element, and Yb2S3 as the raw material of Yb element. To form the general formula (A1‑xYbx)Ga2S4, weigh the corresponding raw materials; step 201, grind and mix evenly, and sinter at 800~1000°C for 1~4 hours under a protective atmosphere; step 301, cool to room temperature, crush and grind, that is Prepare samples. The rare earth light conversion material of the present invention has a strong near-infrared emission at 975nm, which matches the forbidden band width of single crystal silicon, can effectively improve the photoelectric conversion efficiency of silicon solar cells, and is a potential application in silicon-based solar energy. Photoconversion materials for batteries.

Description

technical field [0001] The invention relates to the technical field of fluorescent powder, in particular to a rare earth light conversion fluorescent powder suitable for silicon-based solar cells and a preparation method thereof. Background technique [0002] In recent years, with the continuous increase of energy demand and the increasing call for environmental protection, people pay more and more attention to renewable energy such as solar energy. Solar energy is considered to be a new type of clean energy to replace traditional fossil energy because of its clean, non-polluting, renewable and other advantages. Solar photoelectric conversion technology is one of the main candidates to solve energy problems. According to the different materials used, solar cells can be divided into: silicon solar cells, multi-component compound thin film solar cells, polymer multilayer modified electrode solar cells, nanocrystalline solar cells, organic solar cells, etc., among which silico...

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Problems solved by technology

[0004] At present, the rare earth light conversion materials that have been studied more to improve the photoelectric conversion efficiency of silicon solar cells mainly use Yb 3+ The ions are located near 1000 nm in the near-infrared emission, which just matches the forbidden band width of single crystal silicon, which is to enhance the Yb 3+ Absorption of ions in the UV-Vis region, usually introduced into Ce 3+ ions as sensitizers, but thus the inevitable presence of Ce 4+ -Yb 2+ Fluorescence quenching caused by the metal-metal charge transfer band, this problem needs to be solved urgently

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