Paper Title:
Trapping Recombination Process and Persistent Photoconductivity in Semi-Insulating 4H SiC
  Abstract

The decay kinetics of a persistent photoconductivity (PPC) in undoped semi-insulating 4H SiC and intercenter charge transfer were studied with EPR, photo-EPR and optical admittance spectroscopy (OAS). A thermally activated charge transfer process that occurs in the dark has been observed. The PPC effect was observed directly in changes in the quality factor of the EPR cavity before and after illumination and by the decay of the OAS signal for deep levels, and indirectly by the excitation and decay of the nitrogen and boron EPR lines that were not observed in the dark before illumination. The decay kinetics of the PPC and photo-induced carrier capture by nitrogen and boron levels were found to follow a stretched exponential form. The PPC in the temperature range from 77 to 300K was found to be produced by a thermally induced charge transfer process involving deep trap levels.

  Info
Periodical
Materials Science Forum (Volumes 527-529)
Edited by
Robert P. Devaty, David J. Larkin and Stephen E. Saddow
Pages
563-566
DOI
10.4028/www.scientific.net/MSF.527-529.563
Citation
E. N. Kalabukhova, S.N. Lukin, D.V. Savchenko, A.A. Sitnikov, W.C. Mitchel, S.R. Smith, S. Greulich-Weber, "Trapping Recombination Process and Persistent Photoconductivity in Semi-Insulating 4H SiC", Materials Science Forum, Vols. 527-529, pp. 563-566, 2006
Online since
October 2006
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$32.00
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