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Träfflista för sökning "WFRF:(Starke J) ;pers:(Virojanadara Chariya)"

Sökning: WFRF:(Starke J) > Virojanadara Chariya

  • Resultat 1-4 av 4
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1.
  • Hetzel, M., et al. (författare)
  • Nanowire Reconstruction on the 4H-SiC(1-102) Surface
  • 2007
  • Ingår i: Silicon Carbide and Related Materials 2006. - : Trans Tech Publications Inc.. ; , s. 529-532
  • Konferensbidrag (refereegranskat)abstract
    • Ordered reconstruction phases on the 4H-SiC(1102) surface have been investigated usinglow-energy electron diffraction (LEED), Auger electron spectroscopy (AES) and scanning tunnelingmicroscopy (STM). After initial hydrogen etching, the samples were prepared by Si deposition andannealing in ultra-high vacuum (UHV). Two distinct reconstruction phases develop upon annealing,first with a (2×1), and at higher temperatures with a c(2×2) LEED pattern. After further annealingthe fractional order LEED spots vanish and a (1x1) pattern develops. For the (2×1) phase, STMmicrographs show that adatom chains develop on large flat terraces, which in view of AES consistof additional Si. These highly linear and equidistant chains represent a self-assembled well-orderedpattern of nanowires developing due to the intrinsic structure of the 4H-SiC(1102) surface. For thec(2×2) phase AES indicates a surface composition close to the bulk stoichiometry. For the (1×1)phase a further Si depletion is observed.
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2.
  • Virojanadara, Chariya, et al. (författare)
  • Atomic and Electronic Structure of the (2x1) and c(2x2) 4H-SiC(1(1)over-bar02) Surfaces
  • 2008
  • Ingår i: SILICON CARBIDE AND RELATED MATERIALS 2007, PTS 1 AND 2. - : Trans Tech Publications Inc.. ; , s. 291-296
  • Konferensbidrag (refereegranskat)abstract
    • The atomic and electronic structure of 4H-SiC(1 1 02) surfaces were investigated usingscanning tunneling microscopy (STM), low-energy electron diffraction (LEED) and photoemission(PES). Two well ordered phases existing on this surface, i.e. (2×1) and c(2×2) are discussed. The(2×1) phase consists of a Si adlayer which is topped by an array of ordered Si-nanowires withelectronic states confined to one dimension. For the c(2×2) phase STM indicates the presence ofadatoms and PES a surface composition close to bulk SiC stoichiometry. A detailed atomic modelfor this c(2×2) phase is proposed.
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3.
  • Virojanadara, Chariya, et al. (författare)
  • Electronic and atomic structure of the 4 H-SiC (1 over(1, ¯) 0 2) -c (2 × 2) surface
  • 2008
  • Ingår i: Surface Science. - : Elsevier BV. - 0039-6028 .- 1879-2758. ; 602:2, s. 525-533
  • Tidskriftsartikel (refereegranskat)abstract
    • The (1 over(1, ¯) 0 2) orientated plane of hexagonal silicon carbide of the 4H polytype consists of a periodic arrangement of stripes with alternating bond configuration on a nanometer scale. The two stripe configurations of the bulk truncated surface have an atomic structure very close to the carbon-face SiC basal plane and the cubic SiC(1 0 0) surface, respectively. The structural and electronic properties of the c(2 × 2) reconstruction on the 4 H-SiC (1 over(1, ¯) 0 2) surface were investigated using photoemission spectroscopy (PES), scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). The core level photoemission spectra reveal two surface shifted Si2p components and one shifted C1s component in addition to the SiC bulk peaks. In accordance with the periodicity observed in LEED, atomically resolved STM micrographs show a c(2 × 2) arrangement of bright features which are accounted as Si adatoms. The electronic structure of this SiC (1 over(1, ¯) 0 2) -c (2 × 2) phase is experimentally determined by angle resolved PES studies of the valence band revealing four surface states. Based on the experimental observations and a comparison to similar phases on other SiC surfaces, a tentative surface model can be developed which consists of Si adatoms in so-called H3 sites on the basal-plane type stripes and carbon dimers in Si bridging configuration on the cubic stripes of the bulk truncated surface. © 2007 Elsevier B.V. All rights reserved.
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4.
  • Virojanadara, Chariya, et al. (författare)
  • Silicon adatom chains and one-dimensionally confined electrons on 4H-SiC(1-102): The (2x1) reconstruction
  • 2008
  • Ingår i: Surface Science. - : Elsevier. - 0039-6028 .- 1879-2758. ; 602:22, s. 3506-3509
  • Tidskriftsartikel (refereegranskat)abstract
    • The electronic and atomic structure of the 4H-SiC surface was investigated. Photoemission data indicate that the surface contains about 2 Si layers on top of the bulk layers. Scanning tunneling microscopy images show that these adlayers are terminated by an ordered array of adatom chains separated by the unit cell size. An electronic surface state located at a binding energy of 0.8 eV shows one-dimensional confinement with dispersion only along the chains. Based on the experimental observations, a tentative (2 × 1) surface model is derived with the surface terminated by alternating chains of Si adatoms and Si dimers in between.
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  • Resultat 1-4 av 4

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