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Scanning tunnelling spectroscopy of quantized electron accumulation at InxGa1-xN surfaces
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UNSPECIFIED (2006) Scanning tunnelling spectroscopy of quantized electron accumulation at InxGa1-xN surfaces. In: Fall Meeting of the European-Materials-Research-Society (E-MRS), Warsaw, POLAND, SEP 05-08, 2005. Published in: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 203 (1). pp. 85-92. doi:10.1002/pssa.200563522 ISSN 0031-8965.
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Official URL: http://dx.doi.org/10.1002/pssa.200563522
Abstract
Electron tunnelling spectroscopy has been used to investigate quantized levels in electron accumulation layers at InGaN surfaces. The tunnelling spectra exhibit a plateau in the normalized conductance which widens with increasing Ga-content, corresponding to the band gap of InGaN. The measured InxGa1-xN band gaps (between similar to 0.65 eV for x = 1 and 1.8 eV for x = 0.43) are consistent with the band gaps determined by previous optical absorption and cathodoluminescence spectroscopy. Additional structures in the spectra reflect the two-dimensional electronic subbands in the surface quantum well. The subband energies depend on Ga-content, bulk doping level and the resultant shape of the surface potential well. The tunnelling spectra are compared with calculations of the potential well, the charge-profile and the subband energies. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics |
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Journal or Publication Title: | PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | ||||
Publisher: | WILEY-V C H VERLAG GMBH | ||||
ISSN: | 0031-8965 | ||||
Official Date: | January 2006 | ||||
Dates: |
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Volume: | 203 | ||||
Number: | 1 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 85-92 | ||||
DOI: | 10.1002/pssa.200563522 | ||||
Publication Status: | Published | ||||
Title of Event: | Fall Meeting of the European-Materials-Research-Society (E-MRS) | ||||
Location of Event: | Warsaw, POLAND | ||||
Date(s) of Event: | SEP 05-08, 2005 |
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