title: High-performance photoconductivity and electrical transport of ZnO/ZnS core/shell nanowires for multifunctional nanodevice applications.
abstract: We report the electrical and optical properties of ZnO/ZnS core/shell nanowire (NW) devices. The spatial separation of charge carriers due to their type II band structure together with passivation effect on ZnO/ZnS core/shell NWs not only enhanced their charge carrier transport characteristics by confining the electrons and reducing surface states in the ZnO channel but also increased the photocurrent under ultraviolet (UV) illumination by reducing the recombination probability of the photogenerated charge carriers. Here the efficacy of the type-II band structure and the passivation effect are demonstrated by showing the enhanced subthreshold swing (150 mV/decade) and mobility (17.2 cm2/(Vs)) of the electrical properties, as well as the high responsivity (4.4×10(6) A/W) in the optical properties of the ZnO/ZnS core/shell NWs, compared with the subthreshold swing (464 mV/decade), mobility (8.9 cm2/(Vs)) and responsivity (2.5×10(6) A/W) of ZnO NWs.
authors.affiliation: Department of Nanobio Materials and Electronics and ‡School of Materials Science and Engineering, Gwangju Institute of Science and Technology , Gwangju 500-712, Republic of Korea.
authors.forename: Sehee
authors.initials: S
authors.lastname: Jeong
authors.forename: Minhyeok
authors.initials: M
authors.lastname: Choe
authors.forename: Jang-Won
authors.initials: JW
authors.lastname: Kang
authors.forename: Min Woo
authors.initials: MW
authors.lastname: Kim
authors.forename: Wan Gil
authors.initials: WG
authors.lastname: Jung
authors.forename: Young-Chul
authors.initials: YC
authors.lastname: Leem
authors.forename: Jaeyi
authors.initials: J
authors.lastname: Chun
authors.forename: Bong-Joong
authors.initials: BJ
authors.lastname: Kim
authors.forename: Seong-Ju
authors.initials: SJ
authors.lastname: Park