Single ZnO microrod ultraviolet photodetector with high photocurrent gain
Jun Dai1, Chunxiang Xu, Xiaoyong Xu
1State Key Laboratory of Bioelectronics, Southeast University , Nanjing 210096, China.
ACS Applied Materials & Interfaces
|September 26, 2013
Abstract:
An Ag/ZnO microrod/Ag ultraviolet photodetector is fabricated, the ZnO microrod shows a hexagonal whispering gallery cavity structure. Upon a 325 nm ultraviolet illumination, the device shows a high sensitivity of 4 × 10(4) A/W and a high photocurrent gain of 1.5 × 10(5) at 5 V bias. Under different illumination power P, the photocurrent Ilight obeys a power law relation Ilight ∝ P(0.69). The high performance is probably attributed to a Schottky barrier at Ag/ZnO interface and optical whispering gallery mode effect in the ZnO microrod.
