An Electrically Modulated Single‐Color/Dual‐Color Imaging Photodetector
Lin Li, Hongyu Chen, Zhimin Fang, Xianyi Meng, Chuantian Zuo, Menglan Lv, Yongzhi Tian, Ying Fang, Zuo Xiao, Chongxin Shan, Zhengguo Xiao, Zhiwen Jin, Guozhen Shen, Liang Shen, Liming Ding
Abstract
Abstract An electrically modulated single‐/dual‐color imaging photodetector with fast response speed is developed based on a small molecule (CO i 8DFIC)/perovskite (CH 3 NH 3 PbBr 3 ) hybrid film. Owing to the type‐I heterojunction, the device can facilely transform dual‐color images to single‐color images by applying a small bias voltage. The photodetector exhibits two distinct cut‐off wavelengths at ≈544 nm (visible region) and ≈920 nm (near‐infrared region), respectively, without any power supply. Its two peak responsivities are 0.16 A W −1 at ≈525 nm and 0.041 A W −1 at ≈860 nm with a fast response speed (≈10 2 ns). Under 0.6 V bias, the photodetector can operate in a single‐color mode with a peak responsivity of 0.09 A W −1 at ≈475 nm, showing a fast response speed (≈10 2 ns). A physical model based on band energy theory is developed to illustrate the origin of the tunable single‐/dual‐color photodetection. This work will stimulate new approaches for developing solution‐processed multifunctional photodetectors for imaging photodetection in complex circumstances.