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Contactless electroreflectance studies of Fermi level position on c-plane GaN surface grown by molecular beam epitaxy and metalorganic vapor phase epitaxy

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9 Author(s)
Kudrawiec, R. ; Institute of Physics, Wroclaw University of Technology, Wybrzez˙e Wyspiańskiego 27, 50-370 Wrocław, Poland ; Gladysiewicz, M. ; Janicki, L. ; Misiewicz, J.
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Contactless electroreflectance (CER) has been applied to study the Fermi-level position on c-plane GaN surface in Van Hoof structures grown by molecular beam epitaxy (MBE) and metalorganic vapor phase epitaxy (MOVPE). A clear CER resonance followed by strong Franz-Keldysh oscillation (FKO) of various periods was clearly observed for the series of samples of different thicknesses (30, 50, and 70 nm) of undoped GaN layer. The built-in electric field in this layer has been determined from the period of GaN-related FKO. A good agreement between the calculated and measured electric fields has been found for the Fermi-level located ∼0.4 and ∼0.3 eV below the conduction band for the MBE and MOVPE samples, respectively.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 18 )