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Observation of polarity-switchable photoconductivity in lInitride/MoS_(x)core-shell nanowires

Light(Science & Applications) 2022年第11期11卷 2633-2645页

作者： Danhao Wang wentiao wu Shi Fang Yang Kang Xiaoning Wang Wei Hu Huabin Yu Haochen Zhang Xin Lu Yuanmin Luo Jr-Hau He Lan Fu Shibing Long Sheng Liu Haiding Sun School of Microelectronics University of Science and Technology of ChinaHefei 230029China Hefei National Laboratory for Physical Sciences at the Microscale Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230029China Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong SAR 999077China Department of Electronic Materials Engineering Research School of Physics and EngineeringThe Australian National UniversityCanberraACT 2601Australia School of Microelectronics Wuhan UniversityWuhan 430072China The CAS Key Laboratory of Wireless Optical Communications University of Science and Technology of ChinaHefei 230029China

Ⅱ-Ⅴsemiconductor nanowires are indispensable building blocks for nanoscale electronic and optoelectronic ***,solely relying on their intrinsic physical and material properties sometimes limits device functionalities to meet the increasing demands in versatile and complex electronic *** leveraging the distinctive nature of the one-dimensional geometry and large surface-to-volume ratio of the nanowires,new properties can be attained through monolithic integration of conventional nanowires with other easy-synthesized functional ***,we combine high-crystal-quality lInitridle nanowires with amorphous molybdenum sulfides(a-MoS)to construct ***/a-MoS_(x) core-shell *** light ilumination,such nanostructures exhibit striking spectrally distinctive photodetection characteristic in photoelectrochemical environment,demonstrating a negative photoresponsivity of-100.42 mA W^(-1)under 254 nm ilumination,and a positive photoresponsivity of 29.5 mA W^(-1)under 365 nm *** functional theory calculations reveal that the successful surface modifcation of the nanowires via a-MoS_(x)decoration accelerates the reaction process at the electrolyte/nanowire interface,leading to the generation of opposite photocurrent signals under different photon *** importantly,such polarity-switchable photoconductivity can be further tuned for multiple wavelength bands photodetection by simply adjusting the surrounding environment and/or tailoring the nanowire composition,showing great promise to build light-wavelength controllable sensing devices in the future.

关键词： nanowires versatile striking

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