Ferroelectric CsGeI3 Single Crystals with a Perovskite Structure Grown from Aqueous Solution

作者：Chen, Rui; Liu, Chang; Chen, Yangyang; Ye, Chao; Chen, Shi; Cheng, Jinrong; Cao, Shixun; Wang, Shenghao^*; Cui, Anyang; Hu, Zhigao; Lin, He; Wu, Jinlong; Kong, Xiang Yang; Ren, Wei^*

来源：Journal of Physical Chemistry C, 2023, 127(1): 635-641.

DOI：10.1021/acs.jpcc.2c06818

• HALIDE PEROVSKITES
• LONE-PAIR
• POLARIZATION
• SEMICONDUCTORS
• CSPBBR3
• EFFICIENCY
• OXIDES

All-inorganic perovskite halide semiconductors have been noticed for applications in photovoltaics, light-emitting diodes, lasers, and photodetectors, thanks to their exceptional optoelectronic characteristics. As a typical example, CsGeI3 was previously investigated in the forms of quantum dots and thin films. Here, we developed a technique based on aqueous solution to synthesize millimeter-level-sized CsGeI3 single crystals. The ferroelectric and photoelectric functionalities of the as-grown crystals were examined and compared with the prediction from density functional theory calculation. These findings not only provide a new route to make germanium-based perovskite single crystals but also introduce possible prospects for ferroelectric photovoltaics.

• 单位
  中国科学院; 上海大学; 上海交通大学