Role of nanoscale strain inhomogeneity on the light emission from InGaN epilayers

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de Sousa Pereira, Sergio Manuel and O'Donnell, Kevin Peter and da Costa Alves, Eduardo Jorge (2007) Role of nanoscale strain inhomogeneity on the light emission from InGaN epilayers. Advanced Functional Materials, 17 (1). pp. 37-42. ISSN 1616-301X (https://doi.org/10.1002/adfm.200600650)

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Abstract

InGaN is the basis of a new generation of light-emitting devices, with enormous technological potential; it is currently one of the most intensively studied semiconductor materials. It is generally accepted that compositional fluctuations resulting from phase segregation are the origin of the high luminescence efficiency of InGaN. Evidence to show that nanoscale strain inhomogeneity plays a fundamental role in determining the spectral properties of InGaN-GaN heterostrucures is reported. For layers above a certain critical thickness, a strong spatially varying strain profile accompanies a nonplanar surface morphology, which is associated with a transition from a planar 2D to a Stranski-Krastanow-like-2D-3D growth mode; the strong dependence of the critical thickness on the local InN content of the growing films drives a non-linear growth instability. Within this framework, apparently disparate experimental observations regarding structural and optical properties,previously reported for InGaN layers, are reconciled by a simple phenomenological description.

ORCID iDs

de Sousa Pereira, Sergio Manuel, O'Donnell, Kevin Peter ORCID logoORCID: https://orcid.org/0000-0003-3072-3675 and da Costa Alves, Eduardo Jorge;
  • Item type:Article
    ID code:31162
    Dates:
    Date
    Event
    5 January 2007
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:23 Jun 2011 14:54
    Last modified:23 Nov 2024 14:14
    URI:https://strathprints.strath.ac.uk/id/eprint/31162
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