Efficient energy transfer in Cs4MnxCd1−xSb2Cl12 layered perovskites and anomalously responsive photodetectors

Abstract

Mn²⁺-doped all inorganic Cs₄M^IIM^III₂Cl₁₂ (M^II = Cd²⁺, Mn²⁺, Cu²⁺; M^III = Bi³⁺, Sb³⁺) layered halide perovskites have recently attracted extensive interest for their remarkable photoelectric properties. However, the intrinsic photophysical process of Cs₄M^IIM^III₂Cl₁₂ is not clear yet and the potential applications in the field of optoelectronic devices remain unexplored. Herein, we synthesized a series of luminescent all-inorganic Cs₄Mn_xCd_1−xSb₂Cl₁₂ layered perovskites and found that the efficient energy transfer process in Cs₄Mn_xCd_1−xSb₂Cl₁₂ layered perovskites dominates the luminescence process. Furthermore, a photodetector based on a Cs₄Mn_0.25Cd_0.75Sb₂Cl₁₂ single crystal was fabricated and an anomalously negative photo-response collapse was observed. This anomalous photo-response is attributed to the deep capture of charge carriers by light-induced trap states. Our results provide deep physical insights into the photophysical process in Cs₄Mn_xCd_1−xSb₂Cl₁₂ layered perovskites and open up an avenue in the field of optoelectronic devices.