Physical model for the exotic ultraviolet photo-conductivity of ZnO nanowire films  

作　　者：潘跃武 任守田 曲士良 王强 

机构地区：[1]Mathematics and Physical Sciences Technology, Xuzhou Institute of Technology [2]Department of Optoelectronic Science, Harbin Institute of Technology at Weihai

出　　处：《Chinese Physics B》2013年第11期634-639,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11274082 and 51172194);the Excellent Young Scientist Research Award Fund of Shandong Province,China(Grant No.BS2011CL002)

摘　　要：Employing a simple and efficient method of electro-chemical anodization, ZnO nanowire films are fabricated on Zn foil, and an ultraviolet （UV） sensor prototype is formed for investigating the electronic transport through back-to-back double junctions. The UV （365 nm） responses of surface-contacted ZnO film are provided by I-V measurement, along with the current evolution process by on/off of UV illumination. In this paper, the back-to-back metal-seconductor-metal （M-S-M） model is used to explain the electronic transport of a ZnO nanowire film based structure. A thermionic-field electron emission mechanism is employed to fit and explain the as-observed UV sensitive electronic transport properties of ZnO film with surface-modulation by oxygen and water molecular coverage.Employing a simple and efficient method of electro-chemical anodization, ZnO nanowire films are fabricated on Zn foil, and an ultraviolet （UV） sensor prototype is formed for investigating the electronic transport through back-to-back double junctions. The UV （365 nm） responses of surface-contacted ZnO film are provided by I-V measurement, along with the current evolution process by on/off of UV illumination. In this paper, the back-to-back metal-seconductor-metal （M-S-M） model is used to explain the electronic transport of a ZnO nanowire film based structure. A thermionic-field electron emission mechanism is employed to fit and explain the as-observed UV sensitive electronic transport properties of ZnO film with surface-modulation by oxygen and water molecular coverage.

关 键 词：ZnO nanowires metal-semiconductor-metal contact water modulated surface barrier thermionic-field electron emission 

分 类 号：O484.1[理学—固体物理]