Peculiarities in the pressure dependence of photoluminescence in InAlN

Agata Kaminska, Piotr Nowakowski, Grzegorz Staszczak, Tadeusz Suski, Andrzej Suchocki, Jean François Carlin, Nicolas Grandjean, Robert Martin, Akio Yamamoto

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3 Citations (Scopus)

Abstract

Studies of ambient-pressure and high-pressure behavior of photoluminescence (PL) for series of InxAl1-xN layers are presented. The measured evolution of PL energy (EPL) with x is characterized by a clear decrease of EPL and exhibits a strong bowing. This dependence corresponds to the predictions of ab initio calculations of the band-gap energy changes EG with x. However, values of EPL are clearly lower than EG, for 0<x<0.3. For higher x, the measured EPL follows well the calculated EG. The experimentally determined pressure coefficient of PL energy (dEPL/dp) shows a complicated behavior for alloys with different In-content. We found a strong reduction of dEPL/dp for 0<x<0.3 and a relatively constant magnitude of this coefficient for higher x. Moreover, for the lower x region, we observed dEPL/dp that can differ even by a factor two in samples with nominally very similar In-content. The general tendency in dEPL/dp evolution with x corresponds to lower values than calculated dEG/dp for alloys with non-uniform indium distribution. We propose two not necessary independent explanations of these experimental findings. First, due to non-uniform In distribution (induced, e.g. by defects or non-homogeneous strain) both EPL and dEPL/dp are reduced. Second, a similar behavior results from an involvement of the localized states, whose formation and contribution to PL can be induced by strain and/or native defects. In both hypotheses, the strain/defect density can significantly change around x≈0.18 where InxAl1-xN layers are lattice matched to GaN template.

Original languageEnglish
Pages (from-to)677-682
Number of pages6
JournalPhysica Status Solidi B
Volume250
Issue number4
DOIs
Publication statusPublished - 1 Apr 2013

Keywords

  • high-pressure spectroscopy
  • photoluminescence
  • pressure coefficients
  • ternary nitride alloys
  • InAlN

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    Kaminska, A., Nowakowski, P., Staszczak, G., Suski, T., Suchocki, A., Carlin, J. F., Grandjean, N., Martin, R., & Yamamoto, A. (2013). Peculiarities in the pressure dependence of photoluminescence in InAlN. Physica Status Solidi B, 250(4), 677-682. https://doi.org/10.1002/pssb.201200652