title: Anomalous quantum efficiency for photoconduction and its power dependence in metal oxide semiconductor nanowires.
abstract: The quantum efficiency and carrier lifetime that decide the photoconduction (PC) efficiencies in the metal oxide semiconductor nanowires (NWs) have been investigated. The experimental result surprisingly shows that the SnO2, TiO2, WO3, and ZnO NWs reveal extraordinary quantum efficiencies in common, which are over one to three orders of magnitude lower than the theoretical expectation. The surface depletion region (SDR)-controlled photoconductivity is proposed to explain the anomalous quantum efficiency and its power dependence. The inherent difference between the metal oxide nanostructures such as carrier lifetime, carrier concentration, and dielectric constant leading to the distinct PC performance and behavior are also discussed.
authors.affiliation: Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Rd., Taipei 10607, Taiwan. rsc@mail.ntust.edu.tw
authors.forename: R S
authors.initials: RS
authors.lastname: Chen
authors.forename: W C
authors.initials: WC
authors.lastname: Wang
authors.forename: M L
authors.initials: ML
authors.lastname: Lu
authors.forename: Y F
authors.initials: YF
authors.lastname: Chen
authors.forename: H C
authors.initials: HC
authors.lastname: Lin
authors.forename: K H
authors.initials: KH
authors.lastname: Chen
authors.forename: L C
authors.initials: LC
authors.lastname: Chen