Low-voltage and fast-response SnO <sub>2</sub> nanotubes/perovskite heterostructure photodetector
Hao Li, Peilong Xu, Di Liu, Junyu He, Hongliang Zu, Jianjun Song, Jun Zhang, Fenghui Tian, Maojin Yun, Fengyun Wang
Abstract
Abstract One-dimensional metal-oxides (1D-MO) nanostructure has been regarded as one of the most promising candidates for high-performance photodetectors due to their outstanding electronic properties, low-cost and environmental stability. However, the current bottlenecks are high energy consumption and relatively low sensitivity. Here, Schottky junctions between nanotubes (NTs) and FTO were fabricated by electrospinning SnO 2 NTs on FTO glass substrate, and the bias voltage of SnO 2 NTs photodetectors was as low as ∼1.76 V, which can effectively reduce energy consumption. Additionally, for improving the response and recovery speed of SnO 2 NTs photodetectors, the NTs were covered with organic/inorganic hybrid perovskite. SnO 2 NTs/perovskite heterostructure photodetectors exhibit fast response/recovery speed (∼0.075/0.04 s), and a wide optical response range (∼220–800 nm). At the same time, the bias voltage of heterostructure photodetectors was further reduced to 0.42 V. The outstanding performance is mainly attributed to the formation of type-II heterojunctions between SnO 2 NTs and perovskite, which can facilitate the separation of photogenerated carriers, as well as Schottky junction between SnO 2 NTs and FTO, which reduce the bias voltage. All the results indicate that the rational design of 1D-MO/perovskite heterostructure is a facile and efficient way to achieve high-performance photodetectors.