Gui Pengbin, Sun Yanming, Yang Liangpan, Xia Zhaosheng, Wang Shuxin, Wang Zhouyin, Chen Zhiliang, Zeng Wei, Ren Xingang, Wang Siliang, Fang Guojia
Information Materials and Intelligent Sensing Laboratory of Anhui Province, Industry-Education-Research Institute of Advanced Materials and Technology for Integrated Circuits, School of Electronic and Information Engineering, Anhui University, Hefei, Anhui 230601, People's Republic of China.
Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, Hubei 430072, People's Republic of China.
ACS Appl Mater Interfaces. 2023 Dec 27;15(51):59955-59963. doi: 10.1021/acsami.3c15029. Epub 2023 Dec 12.
Metal halide-perovskite-based photodetectors have recently emerged as a class of promising optoelectronic devices in various fields. Meanwhile, nano/microstructuring perovskite-based photodetectors are a facile integration with complementary metal-oxide semiconductors for miniaturized imaging systems. However, there are still challenges to be overcome in reducing the losses caused by light reflection on the surface of microstructural perovskites. In this work, surface microstructure engineering is employed in MAPbBr microsheets for reducing light reflection and improving light absorption, resulting in high-performance perovskite photodetectors. MAPbBr microsheets, which possess different surface morphologies of flat, upright hemisphere arrays and inverted hemisphere arrays (IHAs), are fabricated by a simple microstructure template-assisted space confinement process. The light absorption capacity of IHA MAPbBr is significantly higher than that of the other two structures. Hence, IHA photodetectors with excellent figures of merit, including low dark current, decent responsivity, and fast speed, are achieved. Furthermore, the noise of the IHA photodetectors is only ∼10 A/, which results in the superior sensitivity for weak light detection with a specific detectivity up to 10 Jones. Our results demonstrate that surface engineering is a simple, low-cost, yet effective approach to improve the performance of nano-/micro-optoelectronic devices.
基于金属卤化物钙钛矿的光电探测器最近已成为各类领域中一类很有前景的光电器件。与此同时，基于钙钛矿的纳米/微结构光电探测器便于与互补金属氧化物半导体集成，用于小型化成像系统。然而，在减少微结构钙钛矿表面光反射所造成的损耗方面，仍存在有待克服的挑战。在这项工作中，对MAPbBr微片采用表面微结构工程，以减少光反射并提高光吸收，从而得到高性能的钙钛矿光电探测器。通过一种简单的微结构模板辅助空间限制工艺制备出具有平坦、直立半球阵列和倒置半球阵列（IHA）等不同表面形貌的MAPbBr微片。IHA MAPbBr的光吸收能力显著高于其他两种结构。因此，实现了具有优异品质因数的IHA光电探测器，包括低暗电流、良好的响应度和快速速度。此外，IHA光电探测器的噪声仅约为10 A/，这使得其对弱光检测具有卓越的灵敏度，比探测率高达10 Jones。我们的结果表明，表面工程是一种简单、低成本且有效的方法，可用于提高纳米/微光电器件的性能。
