High detectivity mechanism of ZnO-based nanorod ultraviolet photodetectors

Chia Hsun Chen, Ching Ting Lee

研究成果: Article同行評審

20 引文 斯高帕斯(Scopus)

摘要

ZnO nanorod arrays are grown on Mg-doped GaN layer using the vapor cooling condensation system. To suppress the surface states and the dangling bonds residing on the sidewall surface of the ZnO nanorods, photoelectrochemical (PEC) surface passivation is carried out on the ZnO nanorods. The peak photoresponsivity of the unpassivated and the passivated ZnO nanorod photodetectors operating at-5 V was 3.0× 103 A W and 4.6× 102 A W, respectively. The PEC treatment dramatically reduces the noise equivalent power level and increased the specific detectivity up to a value of 1.43× 1015 cmHz1/2 W-1 Moreover, the noise power density spectra of the ZnO nanorod array photodetectors changed from the dependence of 1/f2 to 1/f. These results demonstrate that the generation-recombination centers are successfully passivated by the PEC oxidation method.

原文English
文章編號6412719
頁(從 - 到)348-351
頁數4
期刊IEEE Photonics Technology Letters
25
發行號4
DOIs
出版狀態Published - 2013 二月 8

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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