Zhang Yong, Xu Wenxin, Xu Xiaojie, Cai Jian, Yang Wei, Fang Xiaosheng
Department of Materials Science , Fudan University , Shanghai 200433 , People's Republic of China.
J Phys Chem Lett. 2019 Feb 21;10(4):836-841. doi: 10.1021/acs.jpclett.9b00154. Epub 2019 Feb 11.
Multiband detection has always been a challenge and has drawn much attention in the development of photodetectors (PDs). Herein, we present controllable synthesis of SnO wires with different sizes via chemical vapor deposition and formed composites with CsPbBr particles to realize dual spectral response. We constructed PDs based on a single SnO millimeter wire decorated with CsPbBr particles (SnO MMW/CsPbBr), which showed a stepped spectrum, fast response speed, and self-powered function. Meanwhile, SnO microwires/CsPbBr composites (SnO MWs/CsPbBr) were also utilized to fabricate PDs. It is noteworthy that detection occurred in two different wavelength bands (320 and 520 nm) with equivalent intensity at a bias of 0 V. The self-powered feature of this device comes from the built-in electric field at the interface of SnO/CsPbBr, and the dual-color response originates from asymmetric junction barriers between conduction bands of SnO and CsPbBr. This work demonstrated promising self-powered PDs that are capable of multiband detection.
多波段探测一直是一项挑战，在光电探测器（PD）的发展过程中备受关注。在此，我们通过化学气相沉积法可控合成了不同尺寸的SnO线，并与CsPbBr颗粒形成复合材料以实现双光谱响应。我们基于装饰有CsPbBr颗粒的单根SnO毫米线（SnO MMW/CsPbBr）构建了光电探测器，其呈现出阶梯状光谱、快速响应速度和自供电功能。同时，SnO微线/CsPbBr复合材料（SnO MWs/CsPbBr）也被用于制造光电探测器。值得注意的是，在0 V偏压下，该探测器在两个不同波长波段（320和520 nm）具有同等强度的探测能力。该器件的自供电特性源于SnO/CsPbBr界面处的内建电场，双色响应则源于SnO和CsPbBr导带之间的不对称结势垒。这项工作展示了具有多波段探测能力的、前景广阔的自供电光电探测器。
