Alloy fluctuations at dislocations in III-Nitrides: identification and impact on optical properties
Authors
Chen, P
Rhode, SL
Horton, MK
O'Hanlon, TJ
Kovacs, A
Zielinski, MS
Kappers, Menno
Dunin-Borkowski, RE
Humphreys, C
Journal Title
Proceedings of SPIE - The International Society for Optical Engineering
ISSN
0277-786X
Publisher
Society of Photo-optical Instrumentation Engineers (SPIE)
Volume
10532
Number
105320R
Language
eng
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Massabuau, F., Chen, P., Rhode, S., Horton, M., O'Hanlon, T., Kovacs, A., Zielinski, M., et al. (2018). Alloy fluctuations at dislocations in III-Nitrides: identification and impact on optical properties. Proceedings of SPIE - The International Society for Optical Engineering, 10532 (105320R) https://doi.org/10.1117/12.2288211
Abstract
We investigated alloy fluctuations at dislocations in III-Nitride alloys (InGaN and AlGaN). We found that in both alloys, atom segregation (In segregation in InGaN and Ga segregation in AlGaN) occurs in the tensile part of dislocations with an edge component. In InGaN, In atom segregation leads to an enhanced formation of In-N chains and atomic condensates which act as carrier localization centers. This feature results in a bright spot at the position of the dislocation in the CL images, suggesting that non-radiative recombination at dislocations is impaired. On the other hand, Ga atom segregation at dislocations in AlGaN does not seem to noticeably affect the intensity recorded by CL at the dislocation. This study sheds light on why InGaN-based devices are more resilient to dislocations than AlGaN-based devices. An interesting approach to hinder non-radiative recombination at dislocations may therefore be to dope AlGaN with In.
Sponsorship
ERC
Funder references
European Research Council (279361)
Engineering and Physical Sciences Research Council (EP/M010589/1)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1117/12.2288211
This record's URL: https://www.repository.cam.ac.uk/handle/1810/278529
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