Structural and electrical properties of core-shell structured GaP nanowires with outer Ga2O3 oxide layers

B. K. Kim, H. Oh, E. K. Jeon, S. R. Kim, J. R. Kim, J. J. Kim, J. O. Lee, Cheol Jin Lee

Research output: Contribution to journalArticle

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Abstract

This paper presents a review of our current experimental research on GaP nanowires grown by a vapor deposition method. Their structural, electrical, opto-electric transport, and gas-adsorption properties are reviewed. Our structural studies showed that a GaP nanowire consisted of a core-shell structure with a single-crystalline GaP core and an outer Ga2O 3 layer. The individual GaP nanowires exhibited n-type field effects. Their electron mobilities were in the range of about 6 to 22 cm 2/V∈s at room temperature. When the nanowires were illuminated with an ultraviolet light source, an abrupt increase of conductance occurred resulting from carrier generation in the nanowire and de-adsorption of adsorbed OH- or O2 - ions on the Ga2O 3 surface shell. Using an intrinsic Ga2O3 shell layer as a gate dielectric, top-gated GaP nanowire field-effect transistors were fabricated and characterized. Like other metal oxide nanowires, the carrier concentration and mobility of GaP nanowires were significantly affected by the surface molecular adsorption of OH or O2. The GaP nanowire devices were fabricated as sensors for NO2, NH3, and H2 gases by using a simple metal decoration technique.

Original languageEnglish
Pages (from-to)255-263
Number of pages9
JournalApplied Physics A: Materials Science and Processing
Volume85
Issue number3
DOIs
Publication statusPublished - 2006 Nov 1

Fingerprint

Shells (structures)
Oxides
Nanowires
Structural properties
Electric properties
nanowires
electrical properties
oxides
adsorption
Metals
Adsorption
Gas adsorption
Vapor deposition
Electron mobility
Gate dielectrics
Carrier mobility
Field effect transistors
electron mobility
gases
ultraviolet radiation

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Structural and electrical properties of core-shell structured GaP nanowires with outer Ga2O3 oxide layers. / Kim, B. K.; Oh, H.; Jeon, E. K.; Kim, S. R.; Kim, J. R.; Kim, J. J.; Lee, J. O.; Lee, Cheol Jin.

In: Applied Physics A: Materials Science and Processing, Vol. 85, No. 3, 01.11.2006, p. 255-263.

Research output: Contribution to journalArticle

Kim, B. K. ; Oh, H. ; Jeon, E. K. ; Kim, S. R. ; Kim, J. R. ; Kim, J. J. ; Lee, J. O. ; Lee, Cheol Jin. / Structural and electrical properties of core-shell structured GaP nanowires with outer Ga2O3 oxide layers. In: Applied Physics A: Materials Science and Processing. 2006 ; Vol. 85, No. 3. pp. 255-263.
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