Highly-Sensitive, Flexible, and Self-Powered UV Photodetectors Based on Perovskites Cs₃Cu₂I₅/ PEDOT: PSS Heterostructure
Yan Cheng, Chong Li, Jiean Li, Tianyu Li, Yuqiong Sun, Jing Zhang, Feiyu Wang, Yun Li, Yi Shi, Lijia Pan
Abstract
Herein, we demonstrate a highly-sensitive, flexible, and self-powered UV photodetector based on perovskites Cs3Cu2I5/PEDOT: PSS heterostructure. The device shows a high photoresponsivity ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${R}$ </tex-math></inline-formula> ) of 170.3 mA/W, on/off ratio of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$5.7\times 10^{{3}}$ </tex-math></inline-formula> , response/recovery time of 177.0/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$195.2 \mu \text{s}$ </tex-math></inline-formula> , and good specific detectivity ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${D}^{\ast }$ </tex-math></inline-formula> ) of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1.0\times 10^{{13}}$ </tex-math></inline-formula> Jones to 275 nm light at self-powered mode. Benefiting from the solvent vapor annealing process, the Cs3Cu2I5 film is conformally attached to the flexible substrate and maintains relatively high performance at a curvature radius of 3 mm. Our work could pave the way to open up high-performance self-powered perovskites UV photodetector in flexible solution-based optoelectronics.