Abstract
Metal halide perovskite single-crystal detectors have attracted increasing attention due to the advantages of low noise, high sensitivity, and fast response. However, the narrow photoresponse range of widely investigated lead-based perovskite single crystals limit their application in near-infrared (NIR) detection. In this work, tin (Sn) is incorporated into methylammonium lead iodide (MAPbI3) single crystals to extend the absorption range to around 950 nm. Using a space-confined strategy, MAPb0.5Sn0.5I3 single-crystal thin films with a thickness of 15 μm is obtained, which is applied for sensitive NIR detection. The as-fabricated detectors show a responsivity of 0.514 A/W and a specific detectivity of 1.4974×1011 cmHz1/2/W under 905 nm light illumination and –1V. Moreover, the NIR detectors exhibit good operational stability (∼30000 s), which can be attributed to the low trap density and good stability of perovskite single crystals. This work demonstrates an effective way for sensitive NIR detection.
Highlights
Metal halide perovskite with an ABX3 structure shows promising potential for various applications, such as detectors and solar cells (Xiao et al, 2014), light-emitting diodes, lasers, and field-effect transistors, due to long carrier diffusion length, tunable optical bandgaps, flexibility, low cost and easy fabrication (Ju et al, 2019)
Bao et al (2017) reported visible-light photodetectors based on MAPbI3 and MAPbBr3 single-crystal thin film with high photoresponsivity, low noise, and large linear dynamic range
The inverse temperature crystallization (ITC) method was applied for the growth of MAPb0.5Sn0.5I3 single crystals in which solubility decreases with increasing temperature (Saidaminov et al, 2015)
Summary
Metal halide perovskite with an ABX3 structure shows promising potential for various applications, such as detectors and solar cells (Xiao et al, 2014), light-emitting diodes, lasers, and field-effect transistors, due to long carrier diffusion length, tunable optical bandgaps, flexibility, low cost and easy fabrication (Ju et al, 2019). Perovskite photodetectors show excellent performances such as fast response speed, high detectivity, low noise, and large linear dynamic range (Li et al, 2020). A slow crystallization process is believed to provide a universal strategy to improve crystal quality (Liu et al, 2018). Compared to polycrystalline thin films, higher crystallization quality and longer carrier diffusion length can be observed in single crystals (Huang et al, 2015; Liu et al, 2016). Bao et al (2017) reported visible-light photodetectors based on MAPbI3 (iodine) and MAPbBr3 (bromine) single-crystal thin film with high photoresponsivity, low noise, and large linear dynamic range. Chen et al (2019a) fabricated visible-blind UV (ultraviolet) photodetectors based on MAPbCl3 (chlorine) single-crystal thin film with 15-ns response time Bao et al (2017) reported visible-light photodetectors based on MAPbI3 (iodine) and MAPbBr3 (bromine) single-crystal thin film with high photoresponsivity, low noise, and large linear dynamic range. Chen et al (2019a) fabricated visible-blind UV (ultraviolet) photodetectors based on MAPbCl3 (chlorine) single-crystal thin film with 15-ns response time
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