Perovskite Materials: Solar Cell and Optoelectronic Applications

Abstract

Hybrid organometallic trihalide perovskites are promising candidates in the applications for next‐generation, high‐performance, low‐cost optoelectronic devices, including photovoltaics, light‐emitting diodes, and photodetectors. In particular, the solar cells based on this type of materials have reached 22% lab‐scale power conversion efficiency in only about 7 years, comparable to the other thin‐film photovoltaic technologies. Hybrid perovskite materials not only exhibit superior optoelectronic properties but also show many interesting physical properties such as ion migration and defect physics, which may allow the exploration of more device functionalities. In this article, the fundamental understanding of the interrelationships between crystal structure, electronic structure, and material properties is discussed. Various chemical synthesis and processing methods for superior device performance in solar cells and optoelectronic devices are reviewed.

Rubidium Doping to Enhance Carrier Transport in CsPbBr3 Single Crystals for High-Performance X-Ray Detection

“…We note that only a small amount of Rb was successfully doped into the Cs (1– x ) Rb x PbBr 3 single crystals. This is probably because RbBr prefers to react with PbBr 2 to form RbPbBr 3 rather than Cs (1– x ) Rb x PbBr 3 at high RbBr-loading concentration and the resulting RbPbBr 3 is soluble in dimethyl sulfoxide (DMSO) solvent, or because Goldschmidt’s tolerance factor of the perovskite crystal structure limits the doping ratio of the smaller atomic size of Rb …”

“…This is probably because RbBr prefers to react with PbBr 2 to form RbPbBr 3 rather than Cs (1−x) Rb x PbBr 3 at high RbBr-loading concentration and the resulting RbPbBr 3 is soluble in dimethyl sulfoxide (DMSO) solvent, 35 or because Goldschmidt's tolerance factor of the perovskite crystal structure limits the doping ratio of the smaller atomic size of Rb. 38 To understand how Rb doping affects the optical properties of CsPbBr 3 , we measured absorption and photoluminescence (PL) spectra of the as-grown Cs (1−x) Rb x PbBr 3 single crystals. As shown in Figure 1d, 0.037% Rb doping leads to an evident red shift of absorption spectra, which was found to shift back at 0.366% Rb doping.…”