Performance enhancement of a hydrothermally grown ZnO-based ultraviolet photodetector using substrate transfer and pyramid-like surface texture

Ying Chi Hung, Shui Jinn Wang, Rong Ming Ko, Sheng Yi Wang, Bing Cheng You, Hsiang Yi Chen, Chun Kai Liao, Sheng Tsang Hsiao

Research output: Contribution to journalArticle

Abstract

A comparative study of the performance of lateral- and vertical-structured UV photodetectors (PDs) based on a hydrothermally grown (HTG) n-ZnO/sputtered p-CuO heterojunction (HJ) is presented. After substrate transfer (ST) conducted using a sonicating bath process, the vertical-structured UV PD showed a fast response and a 310-fold improvement in light responsivity compared with that of the lateral-structured UV PD under UV illumination (365 nm at 3 mW cm-2) at a reverse bias of -1 V. This improvement is attributed to the much shorter conduction path and lake of a seed layer for the vertical structure. With further surface chemical etching of the HTG n-ZnO layer after ST, a pyramid-like surface texture formed and a significantly enhanced UV light response (as high as 943-fold higher) was obtained. The increase in photo-responsivity is due to the removal of the high defect density initial ZnO growth layer and reduced light reflection.

Original languageEnglish
Article numberSBBG19
JournalJapanese Journal of Applied Physics
Volume58
Issue numberSB
DOIs
Publication statusPublished - 2019 Jan 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Performance enhancement of a hydrothermally grown ZnO-based ultraviolet photodetector using substrate transfer and pyramid-like surface texture'. Together they form a unique fingerprint.

  • Cite this