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

Fingerprint

Photodetectors
pyramids
photometers
textures
Textures
augmentation
Substrates
Light reflection
Defect density
lakes
Ultraviolet radiation
Lakes
Seed
Heterojunctions
heterojunctions
seeds
baths
Etching
Lighting
illumination

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Performance enhancement of a hydrothermally grown ZnO-based ultraviolet photodetector using substrate transfer and pyramid-like surface texture",
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.",
author = "Hung, {Ying Chi} and Wang, {Shui Jinn} and Ko, {Rong Ming} and Wang, {Sheng Yi} and You, {Bing Cheng} and Chen, {Hsiang Yi} and Liao, {Chun Kai} and Hsiao, {Sheng Tsang}",
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Performance enhancement of a hydrothermally grown ZnO-based ultraviolet photodetector using substrate transfer and pyramid-like surface texture. / Hung, Ying Chi; Wang, Shui Jinn; Ko, Rong Ming; Wang, Sheng Yi; You, Bing Cheng; Chen, Hsiang Yi; Liao, Chun Kai; Hsiao, Sheng Tsang.

In: Japanese Journal of Applied Physics, Vol. 58, No. SB, SBBG19, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Hung, Ying Chi

AU - Wang, Shui Jinn

AU - Ko, Rong Ming

AU - Wang, Sheng Yi

AU - You, Bing Cheng

AU - Chen, Hsiang Yi

AU - Liao, Chun Kai

AU - Hsiao, Sheng Tsang

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