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Structure design of lead-free chiral-polar perovskites for sensitive self-powered X-ray detection
Xin Dong, Tianqi Chen, Jing Liang, Lei Wang, Huajie Wu, Zhijin Xu, Junhua Luo, Lina Li*


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(Benzimidazolium)2GeI4: A layered two-dimensional perovskite with dielectric switching and broadband near-infrared photoluminescence

Xuan Zhu, Lin Zhou, Xiao-Yun Huang, Yan-Ling Luo, Xin Deng, Xin Yan, Yan-Juan Wang, Yan Qin*, Yuan-Yuan Tang*

Chin. J. Struct. Chem., 2024, 43: 100272. DOI: 10.1016/j.cjsc.2024.100272

June 15, 2024

Lead-free perovskite; Photoluminescence; Two-dimensional perovskite; Lead-free perovskite

ABSTRACT

Two-dimensional (2D) lead halide perovskites have attracted tremendous attention due to their outstanding physical properties. However, the presence of toxic lead is a major problem for large-scale applications. Here, we report the synthesis, phase transition, dielectric and photoluminescence (PL) properties of a lead-free 2D Ge-based perovskite (BIM)2GeI4 (BIM = benzimidazolium) which experiences a phase transition at 405 K accompanied by an order-disorder change of organic spacer. Moreover, the step-like dielectric transition near the phase transition temperature makes it suitable for dielectric switching. Meanwhile, (BIM)2GeI4 has a direct bandgap of 2.23 eV and broadband emission from 550 to 1000 nm, implying its unique optical property for potential near-infrared lighting and displaying. This work provides a fresh example for the development of lead-free 2D Ge-based perovskite with potential applications in the fields of optoelectronics and high temperature dielectric switching.
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