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