Photocurrent enhancement in nanocrystalline-ZnO/Si heterojunction metal-semiconductor-metal photodetectors

Tingfang Yen, Juhyung Yun, Sung Jin Kim, Alexander Cartwright, Wayne A. Anderson

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Nano-crystalline ZnO thin films have been deposited by radio frequency (RF) sputtering on Si substrates and used to fabricate metal-semiconductor-metal photodetectors (MSM-PDs). With this heterojunction structure and proper geometry of MSM interdigitated structure design, photocurrent enhancement has been accomplished. Both MSM-PDs using structures of ZnO/n-Si and ZnO/p-Si gave one to 2 orders higher magnitude photocurrent, respectively, than did the Si only structure. The higher than expected photocurrent has been achieved with n-ZnO/p-Si MSM-PDs showing photo to dark current ratio of 6310 and responsivity of 1.26 A/W. Avalanche multiplication in the ZnO layer is the main reason for improved photocurrent collection and spectral response enhancement in the UV range. Current transport was dominated by space charge limited current due to the nanocrystalline nature of the ZnO.

Original languageEnglish
JournalElectrochemical and Solid-State Letters
Volume14
Issue number10
DOIs
StatePublished - Aug 18 2011
Externally publishedYes

Fingerprint

Photodetectors
Photocurrents
photocurrents
photometers
Heterojunctions
heterojunctions
Metals
Semiconductor materials
augmentation
metals
MSM (semiconductors)
Dark currents
dark current
spectral sensitivity
Electric space charge
multiplication
avalanches
Sputtering
space charge
radio frequencies

ASJC Scopus subject areas

  • Electrochemistry
  • Electrical and Electronic Engineering
  • Materials Science(all)
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Photocurrent enhancement in nanocrystalline-ZnO/Si heterojunction metal-semiconductor-metal photodetectors. / Yen, Tingfang; Yun, Juhyung; Kim, Sung Jin; Cartwright, Alexander; Anderson, Wayne A.

In: Electrochemical and Solid-State Letters, Vol. 14, No. 10, 18.08.2011.

Research output: Contribution to journalArticle

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