Millimeter-Scale Nonlocal Photo-Sensing Based on Single-Crystal Perovskite Photodetector

• Main Authors: Yu-Tao Li, Guang-Yang Gou, Lin-Sen Li, He Tian, Xin Cong, Zhen-Yi Ju, Ye Tian, Xiang-Shun Geng, Ping-Heng Tan, Yi Yang, Tian-Ling Ren
• Format: Article
• Language: English
• Published: Elsevier 2018-09-01
• Series: iScience
• Online Access: http://www.sciencedirect.com/science/article/pii/S2589004218301330

Summary: Organometal trihalide perovskites (OTPs) are promising optoelectronic materials for high-performance photodetectors. However, up to now, traditional polycrystal OTP-based photodetectors have demonstrated limited effective photo-sensing range. Recently, bulk perovskite single crystals have been seen to have the potential for position-sensitive photodetection. Herein, for the first time, we demonstrate a position-dependent photodetector based on perovskite single crystals by scanning a focused laser beam over the device perpendicular to the channel. The photodetector shows the best-ever effective photo-sensing distance up to the millimeter range. The photoresponsivity and photocurrent decrease by nearly an order of magnitude when the beam position varies from 0 to 950 μm and the tunability of carrier diffusion length in CH3NH2PbBr3 with the variation of the exciting laser intensity is demonstrated. Furthermore, a numerical model based on transport of photoexcited carriers is proposed to explain the position dependence. This photodetector shows excellent potential for application in future nanoelectronics and optoelectronics systems. : Physics; Photonics; Optical Materials Subject Areas: Physics, Photonics, Optical Materials