Journal Article

Germanium‐Based Halide Perovskites: Materials, Properties, and Applications

Malavasi, Lorenzo, Chiara, Rossella, Morana, Marta

2021

Overview

Perovskites are attracting an increasing interest in the wide community of photovoltaics, optoelectronic, and detection, traditionally relying on lead‐based systems. This Minireview provides an overview of the current status of experimental and computational results available on Ge‐containing 3D and low‐dimensional halide perovskites. While stability issues analogous to those of tin‐based materials are present, some strategies to afford this problem in Ge metal halide perovskites (MHPs) for photovoltaics have already been identified and successfully employed, reaching efficiencies of solar devices greater than 7 % at up to 500 h of illumination. Interestingly, some Ge‐containing MHPs showed promising nonlinear optical responses as well as quite broad emissions, which are worthy of further investigation starting from the basic materials chemistry perspective, where a large space for properties modulation through compositions/alloying/fnanostructuring is present. Germane to germanium: This Minireview provides an overview of current experimental and computational research in the field of Ge‐based 3D and low‐dimensional halide perovskites. Materials properties, including stability issues and structure‐property correlations are discussed, as well as present and future applications in various fields ranging from photovoltaics to nonlinear optics and optoelectronics.

• Subject: crystal structures / germanium / lead-free perovskites / metal halide perovskites / solar cells