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Screening dynamics of intrinsic electric field in AlGaN quantum wells
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.ORCID iD: 0000-0002-4606-4865
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2008 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 92, no 6, 061907- p.Article in journal (Refereed) Published
Abstract [en]

Shift of the transition energy after pulsed optical excitation in Al0.35Ga0.65N/Al0.49Ga0.51N quantum well (QW) structures with varying well width has been studied by time-resolved photoluminescence. The shift dynamics, which is due to descreening of the intrinsic electric field, has characteristic times similar to carrier lifetimes revealing negligible influence of trapped carriers on screening. Comparison of the experimental spectral shifts with the calculations has shown that the intrinsic field in our AlGaN QWs is about 0.4-0.5 MV/cm, which is about a factor of two smaller than the value calculated using the theoretical polarization constants.

Place, publisher, year, edition, pages
2008. Vol. 92, no 6, 061907- p.
Keyword [en]
POLARIZATION; PHOTOLUMINESCENCE; HETEROSTRUCTURES; INGAN/GAN
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-36438DOI: 10.1063/1.2857467ISI: 000253237900029Scopus ID: 2-s2.0-39349097863OAI: oai:DiVA.org:kth-36438DiVA: diva2:430796
Note
QC 20110712Available from: 2011-07-12 Created: 2011-07-12 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Optical properties and degradation of deep ultraviolet AIGaN-based light-emitting diodes
Open this publication in new window or tab >>Optical properties and degradation of deep ultraviolet AIGaN-based light-emitting diodes
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. 98 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2011:12
Keyword
AIGaN, deep-UV LEDs, polarization fields, screening, exciton binding energy, alloy fluctuations, near-field microscopy, carrier dynamics, LED aging
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-37917 (URN)978-91-7501-065-6 (ISBN)
Public defence
2011-09-20, Sal / Hall C1, Electrum,, Isafjordsgatan 26, Kista, 13:00 (English)
Opponent
Supervisors
Note
QC 20110831Available from: 2011-08-31 Created: 2011-08-19 Last updated: 2012-02-23Bibliographically approved

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Marcinkevicius, Saulius

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