title: Photoconductive enhancement of single ZnO nanowire through localized Schottky effects.
abstract: We demonstrated the Au nanoparticle (NP) decoration as an effective way to enhance both photocurrent and photoconductive gain of single ZnO nanowire (NW) photodetectors (PDs) through localized Schottky effects. The enhancement is caused by the enhanced space charge effect due to the existence of the localized Schottky junctions under open-circuit conditions at the NW surfaces, leading to a more pronounced electron-hole separation effect. Since the band-bending under illumination varies relatively small for an Au NP-decorated ZnO NW, the decay of gain is less prominent with increased excitation power, demonstrating the feasibility for a PD to maintain a high gain under high-power illumination.
authors.affiliation: Institute of Photonics and Optoelectronics, & Department of Electrical Engineering, National Taiwan University, Taipei10617, Taiwan.
authors.forename: Ming-Wei
authors.initials: MW
authors.lastname: Chen
authors.forename: Cheng-Ying
authors.initials: CY
authors.lastname: Chen
authors.forename: Der-Hsien
authors.initials: DH
authors.lastname: Lien
authors.forename: Yong
authors.initials: Y
authors.lastname: Ding
authors.forename: Jr-Hau
authors.initials: JH
authors.lastname: He