Photoconductive enhancement of single ZnO nanowire through localized Schottky effects.
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.
Chen
Ming-Wei
MW
Institute of Photonics and Optoelectronics, & Department of Electrical Engineering, National Taiwan University, Taipei10617, Taiwan.
Chen
Cheng-Ying
CY
Lien
Der-Hsien
DH
Ding
Yong
Y
He
Jr-Hau
JH