Chalcohalide Antiperovskite Thin Films with Visible Light Absorption and High Charge-Carrier Mobility Processed by Solvent-Free and Low-Temperature Methods
Paz Sebastiá-Luna, Nathan Rodkey, Adeem Saeed Mirza, Sigurd Mertens, Snigdha Lal, Axel Melchor Gaona Carranza, Joaquín Calbo, Marcello Righetto, Michele Sessolo, Laura M. Herz, Koen Vandewal, Enrique Ortı́, Monica Morales‐Masis, Henk J. Bolink, Francisco Palazón
Abstract
Silver chalcohalide antiperovskites represent a rather unexplored alternative to lead halide perovskites and other semiconductors based on toxic heavy metals. All synthetic approaches reported so far for Ag 3 SI and Ag 3 SBr 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-temperature method involving mechanochemistry. Structural and optical properties are examined experimentally and supported by first-principles calculations. Furthermore, we deposit Ag 3 SI as thin films by pulsed laser deposition and characterize its optoelectronic properties using optical-pump-terahertz-probe measurements, revealing a high charge-carrier mobility of 49 cm 2 V –1 s –1 . This work paves the way to the implementation of chalcohalide antiperovskites in various optoelectronic applications.