title: On-Nanowire Axial Heterojunction Design for High-Performance Photodetectors.
abstract: We report the growth of high-quality CdS/CdSxSe1-x axial heterostructure nanowires (NWHs) via a temperature-controlled chemical vapor deposition method. Microstructural characterizations revealed that these NWHs have a single-crystalline structure with abrupt heterojunctions. Local photoluminescence and mapping near the heterojunctions show only two separated narrow band-edge emission bands from the two different adjacent semiconductors, further demonstrating the high-quality of these heterostructures. Moreover, the photodetector based on the single NWH shows a performance (higher responsivity (1.18 × 10(2) A/W), faster response speed (rise ∼68 μs, decay ∼137 μs), higher Ion/Ioff ratio (10(5)), higher EQE (3.1 × 10(4) %), and broader detection range (350-650 nm)) at room temperature superior to that of photodetectors based on single band gap nanostructures. This work suggests a much simpler route to achieve superior NWHs for applications in optoelectronic devices.
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.|Department of Physics and Materials Science, City University of Hong Kong , Kowloon, Hong Kong.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Guo
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.
authors.forename: Jinyou
authors.initials: J
authors.lastname: Xu
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Gong
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.
authors.forename: Xia
authors.initials: X
authors.lastname: Shen
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Qiu
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.
authors.forename: Junqi
authors.initials: J
authors.lastname: Xu
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Zou
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.
authors.forename: Chunlei
authors.initials: C
authors.lastname: Wang
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.
authors.forename: Hailong
authors.initials: H
authors.lastname: Yan
authors.affiliation: Key Laboratory of Advanced Micro/Nano Functional Materials, School of Physics and Electronic Engineering, Xinyang Normal University , Xinyang 464000, China.
authors.forename: Yongsong
authors.initials: Y
authors.lastname: Luo
authors.forename: Anlian
authors.initials: A
authors.lastname: Pan
authors.affiliation: Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University , Shenzhen 518060, China.
authors.forename: Han
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , Kowloon, Hong Kong.
authors.forename: Johnny C
authors.initials: JC
authors.lastname: Ho
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , Kowloon, Hong Kong.
authors.forename: Kin Man
authors.initials: KM
authors.lastname: Yu
keywords: heterostructure; high performance; nanowire; photodetectors