PDMS-Assisted Low-Temperature Synthesis of Submillimeter All-Inorganic Halide Perovskite Microcrystals for High-Performance Photodetectors

Authors：Lai, Zhengxun; Meng, You; Wang, Fei; Bu, Xiuming; Chen, Dong; Xie, Pengshan; Wang, Weijun; Li, Dengji; Zhang, Yuxuan; Wang, Wei; Liu, Chuntai; Yip, SenPo; Ho, Johnny C.^*

Source：Advanced Optical Materials, 2022, 10(20): 2201127.

DOI：10.1002/adom.202201127

• Cs
• 2AgBiBr
• (6)
• Cs
• Sb-3
• I-2
• (9)
• CsPbBr
• (3)
• halide perovskites
• photodetectors
• polydimethylsiloxane

All-inorganic halide perovskites (AIHPs) are promising photovoltaic materials that have been extensively studied in the last decade. In addition, lead-free AIHPs are preferred because of their non-toxic and environmentally friendly nature. However, the quality of AIHPs fabricated by conventional solution processing methods is usually unsatisfactory, which leads to poor photoelectric performance. Herein, a facile polydimethylsiloxane-assisted slow evaporation method that can be readily used to synthesize high-quality AIHP microcrystals (MCs) (CsPbBr3, Cs2AgBiBr6, and L-Cs3Sb2I9) is demonstrated. The photodetection properties of the synthesized AIHP MCs and their spin-coated thin-film counterparts are thoroughly studied and compared. Owing to their superior crystallinity, AIHP MCs show better photoelectric performance than spin-coated films. The responsivity of the CsPbBr3 microcrystal photodetectors is approximate to 590 000 mA W-1. This work proposes a universal solution-processing method for the successful fabrication of high-quality all-inorganic lead-based (CsPbBr3), lead-free (L-Cs3Sb2I9), and double (Cs2AgBiBr6) perovskites, which can overcome the bottleneck in the development of halide perovskites and promote their applications.

• Institution
  郑州大学; 中国科学院