White-light emitting diode array of P+-Si/aligned N-SnO 2 nanowires heterojunctions

Kyung Whon Min, Yong Kwan Kim, Gunchul Shin, Seunghun Jang, Moonsup Han, Junghwan Huh, Gyu Tae Kim, Jeong Sook Ha

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We report on the fabrication and optoelectronic properties of p-n heterojunction arrays of p+-type Si and aligned n-type SnO 2 nanowires with high rectification ratios of >104 at ±15 V. The electrical stability of the p-n heterojunction devices was improved by coating the junction with poly(methylmethacrylate) to minimize the degradation of the interface layer at the junction. As a photodiode an enhanced UV photosensitivity higher than 102 was recorded under reverse bias. Using a large forward bias in the light-emitting diode mode white light was emitted from the large-scale heterojunction devices with at least three broad peaks in the visible range, which can be attributed to the interband transitions of the injected electrons or holes mediated by an interfacial SiO2 layer with a contribution of trap-level energies. These results indicate the high potential of Si/SnO2 nanowires heterojunctions as optoelectronic devices with proper tuning of the recombination center at the junctions. The characterization of p+-Si/n-SnO2 nanowire heterojunction diode arrays with ideal rectification behavior is reported. Their high UV-photosensitivity under reverse bias voltages and white-light electroluminescence at forward bias enlarge their future application in optoelectronic devices.

Original languageEnglish
Pages (from-to)119-124
Number of pages6
JournalAdvanced Functional Materials
Volume21
Issue number1
DOIs
Publication statusPublished - 2011 Jan 7

Keywords

  • heterojunctions
  • luminescence
  • microstructures
  • nanowires
  • photoluminescence

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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