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Surface potential effect on excitons in AlGaN/GaN quantum well structures
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-9840-7364
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2597-3322
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
2013 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 102, no 8Article in journal (Refereed) Published
Abstract [en]

AlGaN/GaN quantum well (QW) heterostructures grown by metalorganic chemical vapor deposition on sapphire and on free-standing GaN substrates have been studied by temperature dependent time-resolved photoluminescence. A dominant contribution of the exciton radiative lifetime is observed in homoepitaxial samples even at enhanced temperatures up to 100 K. The QW-related emission is found to be more sensitive to the near surface built-in electric field in the homoepitaxial samples, revealed as a red shift of the QW exciton energy with decreasing the cap layer thickness. Absence of such shift in the heteroepitaxial samples suggests, assuming a surface potential of 0.5 eV, an increased polarization field due to residual compressive stress.

Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2013. Vol. 102, no 8
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-90763DOI: 10.1063/1.4793568ISI: 000315597000049OAI: oai:DiVA.org:liu-90763DiVA: diva2:614686
Note

Funding Agencies|Swedish Research Council (VR)||Swedish Energy Agency||Swedish Governmental Agency for Innovation Systems (VINNOVA)||

Available from: 2013-04-05 Created: 2013-04-05 Last updated: 2017-12-06

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Pozina, GaliaHemmingsson, CarlMonemar, Bo

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