Chalcohalide Antiperovskite Thin Films with Visible Light Absorption and High Charge-Carrier Mobility Processed by Solvent-Free and Low-Temperature Methods

Abstract

Silver chalcohalide antiperovskites represent a ratherunexploredalternative to lead halide perovskites and other semiconductors basedon toxic heavy metals. All synthetic approaches reported so far forAg(3)SI and Ag3SBr require long synthesis times(typically days, weeks, or even months) and high temperatures. Herein,we report the synthesis of these materials using a fast and low-temperaturemethod involving mechanochemistry. Structural and optical propertiesare examined experimentally and supported by first-principles calculations.Furthermore, we deposit Ag3SI as thin films by pulsed laserdeposition and characterize its optoelectronic properties using optical-pump-terahertz-probemeasurements, revealing a high charge-carrier mobility of 49 cm(2) V-1 s(-1). This work pavesthe way to the implementation of chalcohalide antiperovskites in variousoptoelectronic applications.