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- Title
Hybrid Germanium Bromide Perovskites with Tunable Second Harmonic Generation.
- Authors
Liu, Yang; Gong, Ya‐Ping; Geng, Shining; Feng, Mei‐Ling; Manidaki, Despoina; Deng, Zeyu; Stoumpos, Constantinos C.; Canepa, Pieremanuele; Xiao, Zewen; Zhang, Wei‐Xiong; Mao, Lingling
- Abstract
Ge‐based hybrid perovskite materials have demonstrated great potential for second harmonic generation (SHG) due to the geometry and lone‐pair induced non‐centrosymmetric structures. Here, we report a new family of hybrid 3D Ge‐based bromide perovskites AGeBr3, A=CH3NH3 (MA), CH(NH2)2 (FA), Cs and FAGe0.5Sn0.5Br3, crystallizing in polar space groups. These compounds exhibit tunable SHG responses, where MAGeBr3 shows the strongest SHG intensity (5×potassium dihydrogen phosphate, KDP). Structural and theoretical analysis indicate the high SHG efficiency is attributed to the displacement of Ge2+ along [111] direction and the relatively strong interactions between lone pair electrons of Ge2+ and polar MA cations along the c‐axis. This work provides new structural insights for designing and fine‐tuning the SHG properties in hybrid metal halide materials.
- Subjects
SECOND harmonic generation; GERMANIUM; METAL halides; SPACE groups; BROMIDES; PEROVSKITE
- Publication
Angewandte Chemie, 2022, Vol 134, Issue 43, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202208875