Abstract
In recent years, high-performance photodetectors have attracted wide attention because of their important applications including imaging, spectroscopy, fiber-optic communications, remote control, chemical/biological sensing and so on. Nanostructured perovskites are extremely suitable for detective applications with their long carrier lifetime, high carrier mobility, facile synthesis, and beneficial to device miniaturization. Because the structure of the device and the dimension of nanostructured perovskite have a profound impact on the performance of photodetector, we divide nanostructured perovskite into 2D, 1D, and 0D, and review their applications in photodetector (including photoconductor, phototransistor, and photodiode), respectively. The devices exhibit high performance with high photoresponsivity, large external quantum efficiency (EQE), large gain, high detectivity, and fast response time. The intriguing properties suggest that nanostructured perovskites have a great potential in photodetection.
Highlights
An ultrahigh external quantum efficiency (EQE) over 107 % was demonstrated by a phototransistor based on CsPbI3-x Brx quantum dots (QDs)/monolayer MoS2 heterostructure [44]
The high performance of the phototransistor based on graphene/CsPbBr3-xIx NCs can be attributed to the fast carrier transport of graphene and strong light absorption of perovskite NCs
Since most of the photodiode is based on thin film that is constructed by nanostructured perovskites, this part is not divided into different dimensions here
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. In order to obtain a high-performance photodetector with high sensitivity and fast response, the semiconductor needs to have effective charge collection, low trap state density, and high carrier mobility. There is an inherent paradox to simultaneously possess both low dark currents and high photocurrents The former requires a large number of defects or barriers that appear in polycrystalline film to inhibit the transmission of thermally excited carriers [32,33,34], while the latter requires single crystals with good crystallinity for effective charge transfer [35,36,37]. Wang et al [46] systematically summarized the synthesis, optoelectronic properties, and performance of photodetectors based on low-dimensional perovskites. We will review research results in nanostructured perovskite-based photodetectors, focusing on the photodetection performance and potential mechanism. The ability of devices to track the incident light signal
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