Method for improving visible light absorption range of CuSCN

The invention discloses a method for widening the visible light absorption range of CuSCN, and belongs to the technical field of high-pressure preparation of functional materials. The method comprises the following steps: preparing a beta-CuSCN film by adopting a spin-coating method of solution treatment, scraping a sample by utilizing a sharp needle, filling the sample into a sample cavity of a diamond anvil cell press, continuously pressurizing the sample to 9.3 GPa, keeping for 24 hours, and slowly releasing the pressure to normal pressure to obtain a sample with an absorption edge of 427nm and good visible light absorption property. The visible light absorption range of the CuSCN film is increased by nearly 62nm, and the method is simple, convenient to operate and relatively good in repeatability, and has important application value and scientific significance for high-efficiency light pressure sensors under pressure and photovoltaic devices with adjustable pressure in a visible light region. 本发明的一种提高CuSC