한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제50권3호
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  • Pages.141-146
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  • 2017
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
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에피택셜 VO2 박막의 상전이에 대한 미시적 이해

Nanoscopic Understanding of Phase Transition of Epitaxial VO2 Thin Films

  • 김동욱 (이화여자대학교 물리학과) ;
  • 손아름 (성균관대학교 신소재공학부)
  • Kim, Dong-Wook (Department of Physics, Ewha Womans University) ;
  • Sohn, Ahrum (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
  • 투고 : 2017.06.10
  • 심사 : 2017.06.27
  • 발행 : 2017.06.30
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초록

We investigated configuration of metallic and insulating domains in $VO_2$ thin films, while spanning metal-insulator phase transition. Kelvin probe force microscopy, of which spatial resolution is less than 100 nm, enables us to measure local work function (WF) at the sample surface. The WF of $VO_2$ thin films decreased (increased) as increasing (decreasing) the sample temperature, during the phase transition. The higher and lower WF regions corresponded to the insulating and metallic domains, respectively. The metallic fraction, estimated from the WF maps, well explained the temperature-dependent resistivity based on the percolation model. The WF mapping also showed us how the structural defects affected the phase transition behaviors.

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참고문헌

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