Scanning tunneling spectra for the etched surface of ptype HgCdTe
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Dept of Physics and Laboratory for Microstructures,Shanghai University,Dept of Physics and Laboratory for Microstructures,Shanghai University,Dept of Physics and Laboratory for Microstructures,Shanghai University;China,Dept of Physics and Laboratory for Microstructures,Shanghai University,China,Dept of Physics and Laboratory for Microstructures,Shanghai University,Dept of Physics and Laboratory for Microstructures,Shanghai University

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    Abstract:

    Ultrahigh vacuum scanning tunneling microscopy(STM) and spectroscopy (STS)were used to characterize Hg1-xCdxTe grown by liquidphase epitaxy (LPE) method. The sample was etched with 3% Brominemethanol in 2.5 minutes. The STM images display submicrometersized pit structures with depths ranging from a few tens to a few hundreds nanometers. The scanning tunneling spectra show a larger apparent gap than the energy band gap of the bulk material due to the tipinduced band bending effect. In contrast, the scanning tunneling spectra of the pits show a finite slope through zero volt, implying the contribution of high density of band gap states which blur out the band gap information.

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WANG Qing-Yu, REN Xiu-Rong, LI Mao-Sen, XU De-Zheng, GAO Zi-Xuan, ZHA Fang-Xing. Scanning tunneling spectra for the etched surface of ptype HgCdTe[J]. Journal of Infrared and Millimeter Waves,2012,31(3):222~225

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History
  • Received:June 01,2011
  • Revised:July 06,2011
  • Adopted:July 10,2011
  • Online: July 02,2012
  • Published:
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