High detectivity mechanism of ZnO-based nanorod ultraviolet photodetectors

Chia Hsun Chen, Ching Ting Lee

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


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.

Original languageEnglish
Article number6412719
Pages (from-to)348-351
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number4
Publication statusPublished - 2013

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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