Nitrogen-doped ZnO/n-Si core-shell nanowire photodiode prepared by atomic layer deposition

Kyung Yong Ko, Hyemin Kang, Wonseon Lee, Chang Wan Lee, Jusang Park, Hee Sung Lee, Seongil Im, Han Gil Kim, Soo Hyun Kim, Byung Wook Min, Hyungjun Kim

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Photodiodes made from core-shell nanowires (NWs) comprising n-type silicon (n-Si; core) and nitrogen-doped ZnO (ZnO:N; shell) were fabricated by atomic layer deposition of ZnO:N on vertically aligned Si NWs. The device properties were investigated as functions of nitrogen content of the ZnO:N shell. The electron-carrier concentration of ZnO:N was modulated by adjusting the concentration of the reactant, diluted ammonium hydroxide, from 0 to 30%. The rectification ratio and the reverse-current density of the ZnO:N/n-Si planar heterojunction were evaluated under dark condition for various NH4OH concentrations. The ZnO:N/n-Si heterojunction prepared with NH4OH 15% was found to have the lowest reverse-current density with a moderate resistivity. In order to realize an effective ZnO:N/n-Si photodiode, a ZnO:N layer prepared with 15% NH4OH was deposited on well-aligned Si nanowires. The core-shell NW photodiode showed more sensitive photodetecting performance in UV light than the planar photodiode. Also, the significantly enhanced performances of the core-shell NW photodiode were evaluated by examining its spectral responsivity.

Original languageEnglish
Pages (from-to)154-160
Number of pages7
JournalMaterials Science in Semiconductor Processing
Volume33
DOIs
Publication statusPublished - 2015 May

Bibliographical note

Funding Information:
This work was supported by the Center for Integrated Smart Sensors funded by the Ministry of Science, ICT & Future Planning as Global Frontier Project (CISS-2011-0031848).

Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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