In Situ Polymer-Imprinted Architecture of Textured Perovskite Single-Crystal Sheets for Ultraweak-Light Photodetection

作者：Li, Panpan; Huang, Wenjun; Xu, Wenchao; Wei, Xiangfeng; Chen, Yudan; Meng, Fancheng; Deng, Weiqiao; Liu, Jiehua^*

来源：Advanced Optical Materials, 2023, 11(4).

DOI：10.1002/adom.202201876

• single crystal sheets
• polymer membranes
• imprinting
• perovskites
• photoelectric performance

A facile double flexible interfacial imprinting method is reported to obtain the cubic single-crystal CH3NH3PbBr3 sheets with in situ polymer patterns by capillary effect. The imprinted CH3NH3PbBr3 sheets offer good crystallinity and light-trapping structure. As a result, the textured single-crystal photodetector exhibits the superior responsivity of 63.0 A W-1, external quantum efficiency of 1.50 x 10(4)%, and detectivity D* of 8.12 x 10(12) Jones under 520 nm irradiations with a weak power density of 0.54 mu W cm(-2) at 3 V, which are more than 4200% and 80000% higher than those of the photodetector based on single-crystal bulk and polycrystalline film, respectively. The exciting ultraweak-light photoelectric performance is achieved due to the good light trapping and high carrier collection. Especially, the photodetector also exhibits excellent self-powered performance.

• 单位
  山东大学