Improving the performance of ultra-flexible perovskite photodetectors through cation engineering. (8th April 2020)

• Record Type: Journal Article
• Authors: Zhang, Mingdi; Lu, Qieni; Wang, Changlei; Dai, Haitao; Xue, Yongxiang; He, Jiantao; Ge, Baozhen
• Is Part Of: Journal of physics. Volume 53:Number 23(2020)
• Publication Date: 2020-04-08
• Subjects: perovskite photodetectors -- ultra-flexible detectors -- compositional engineering -- mechanical stability; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/ab7a59
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: High performance ultra-flexible lightweight perovskite photodetectors have promising applications on a variety of substrates, including those used on unmanned aerial vehicles. Herein, we report on a facile method to improve the performance of perovskite photodetectors on flexible ultrathin (50 μ m) polyimide substrates by tuning the composition with different ratios of cations. In the presence of lead thiocyanate, the introduction of a certain amount of formamidinium could sufficiently enhance the quality of methylammonium lead triiodide perovskite film, with prolonged carrier lifetime. A perovskite photodetector with a response time of t on = 89 ms and t off = 47 ms is achieved with a very simple device architecture. In addition, our flexible photodetectors maintain good performance after rigorous folding and bending, demonstrating excellent mechanical properties, which could be very useful for a variety of applications.