Nanomesh electrode on MgZnO-based metal-semiconductor-metal ultraviolet photodetectors

Ching Ting Lee, Heng Yu Lin, Chun Yen Tseng

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In this work, the nano-scaled mesh electrodes are fabricated by obliquely depositing metals through the highly ordered polystyrene nanosphere mask. Furthermore, the intrinsic MgZnO film is deposited as the absorption layer for the metal-semiconductor-metal ultraviolet photodetectors (MSM-UV-PDs) using the vapor cooling condensation system. The 100-nm-linewidth nanomesh electrodes with metal occupying a roughly 10% of the device surface region consequently render PDs with a high transmittance in the ultraviolet (UV) wavelength range. The photoresponsivity of MgZnO-based MSM-UV-PDs evaluated at the wavelength of 330 nm with the operating bias voltage of 5 V is elevated from 0.135 to 0.248 A/W when the thin metal electrode is replaced by the nanomesh electrode, and the corresponding quantum efficiency is improved from 50.75 to 93.23%. Finally, adopting the nanomesh electrode also helps to enhance the UV-visible rejection ratio (R330nm/R450nm) and the detectivity from 1663 and 1.78 × 10 10 cmHz 0.5 W-1 to 2480 and 2.43 × 10 10 cmHz 0.5 W-1, respectively.

Original languageEnglish
Article number13705
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Sep 1

All Science Journal Classification (ASJC) codes

  • General

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