High-performance photodetector using CsPbBr 3 perovskite nanocrystals and graphene hybrid channel
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High-performance photodetector using CsPbBr3 perovskite nanocrystals and graphene hybrid channel Yongli Che1,2, Xiaolong Cao1,2,* 1 2
, Yating Zhang2, and Jianquan Yao2
College of Ocean Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
Received: 5 September 2020
ABSTRACT
Accepted: 8 October 2020
All-inorganic cesium lead halide (CsPbX3, X=Cl, Br, I) perovskite nanocrystals (NCs) have attracted increasingly research interest as highly efficient light absorbers in optoelectronic devices for their outstanding optical properties. Here, a CsPbBr3 NCs/graphene hybrid photodetector was demonstrated for efficient ultraviolet light detection, in which CsPbBr3 NCs served as a light absorber, and graphene acted as a carrier transport expressway. The device exhibited high hole and electron mobilities of 1.7 9 103 cm2/V s and 6.4 9 103 cm2/V s in the dark. Under 405 nm illumination, the device showed high responsivity, specific detectivity, external quantum efficiency with maximum values of 3.4 A/W, 7.5 9 108 Jones, 103%, respectively, and short rise/ decay times of 7.9/125 ms. The hybrid PD has important prospects in the photodetection applications of optical communication, biological imaging, remote sensing, and other multifunction optoelectronics.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction Recently, the newly emerging perovskite materials have attracted growing attention as highly efficient light absorbers in optoelectronic devices due to their exceptional photovoltaic and optoelectronic characteristics [1–5]. In particular, all-inorganic perovskite, mostly known as cesium lead halide (CsPbX3, X=Cl, Br, I) perovskite nanocrystals (NCs), are being studied intensively for their outstanding optical
Handling Editor: Kevin Jones.
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https://doi.org/10.1007/s10853-020-05434-4
properties such as tunable bandgap, thermal stability, quantum confinement effects, and balanced electron/hole mobility, which make them suitable for lighting applications in photovoltaic cells, lightemitting devices, lasers, and photodetectors (PDs) [6–8]. CsPbX3 NCs show promises for PD applications with tunable absorption wavelength across the ultraviolet–visible spectrum. The detection performances of the CsPbX3 NCs-based PD are most likely to increase by integrating CsPbX3 NCs on top of a graphene channel, which owns the outstanding
J Mater Sci
photophysical and electronic transport properties. The 2D material, graphene, has been widely applied in various electronic and optoelectronic applications such as transistors, solar cells, and PDs [9–14], due to its advantages of ultrahigh mobility, transparency, mechanical flexibility, and chemical stability [15, 16]. The combination of CsPbBr3 NCs and gr
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