Bowing of the band gap pressure coefficients in InGaN alloys

Franssen, G. and Gorczyca, l. and Suski, T. and Kamińska, A. and Pereiro Viterbo, Juan and Muñoz Merino, Elias and Lliopoulus, E. and Georgakilas, A. and Che, S.B. and Ishitani, Y. and Yoshikawa, A. and Christensen, N.E. and Svane, A. (2008). Bowing of the band gap pressure coefficients in InGaN alloys. "Journal of Applied Physics", v. 103 (n. 3); pp.. ISSN 0021-8979. https://doi.org/10.1063/1.2837072.

Description

Title: Bowing of the band gap pressure coefficients in InGaN alloys
Author/s:
  • Franssen, G.
  • Gorczyca, l.
  • Suski, T.
  • Kamińska, A.
  • Pereiro Viterbo, Juan
  • Muñoz Merino, Elias
  • Lliopoulus, E.
  • Georgakilas, A.
  • Che, S.B.
  • Ishitani, Y.
  • Yoshikawa, A.
  • Christensen, N.E.
  • Svane, A.
Item Type: Article
Título de Revista/Publicación: Journal of Applied Physics
Date: February 2008
ISSN: 0021-8979
Volume: 103
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Ingeniería Electrónica
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The hydrostatic pressure dependence of photoluminescence, dEPL/dp, of InxGa1−xN epilayers has been measured in the full composition range 0_x_1. Furthermore, ab initio calculations of the band gap pressure coefficient dEG/dp were performed. Both the experimental dEPL/dp values and calculated dEG/dp results show pronounced bowing and we find that the pressure coefficients have a nearly constant value of about 25 meV/GPa for epilayers with x_0.4 and a relatively steep dependence for x_0.4. On the basis of the agreement of the observed PL pressure coefficient with our calculations, we confirm that band-to-band recombination processes are responsible for PL emission and that no localized states are involved. Moreover, the good agreement between the experimentally determined dEPL/dp and the theoretical curve of dEG/dp indicates that the hydrostatic pressure dependence of PL measurements can be used to quantify changes of the band gap of the InGaN ternary alloy under pressure, demonstrating that the disorder-related Stokes shift in InGaN does not induce a significant difference between dEPL/dp and dEG/dp. This information is highly relevant for the correct analysis of pressure measurements

More information

Item ID: 2598
DC Identifier: http://oa.upm.es/2598/
OAI Identifier: oai:oa.upm.es:2598
DOI: 10.1063/1.2837072
Official URL: http://jap.aip.org/japiau/v103/i3
Deposited by: Memoria Investigacion
Deposited on: 23 Mar 2010 09:47
Last Modified: 20 Apr 2016 12:15
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