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Suppression of non-radiative surface recombination by N incorporation in GaAs/GaNAs core/shell nanowires
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-6405-9509
Graduate School of Science and Engineering, Ehime University, 790-8577 Matsuyama, Japan.
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-7155-7103
2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, 11653Article in journal (Refereed) Published
Abstract [en]

III-V semiconductor nanowires (NWs) such as GaAs NWs form an interesting artificial materials system promising for applications in advanced optoelectronic and photonic devices, thanks to the advantages offered by the 1D architecture and the possibility to combine it with the main-stream silicon technology. Alloying of GaAs with nitrogen can further enhance performance and extend device functionality via band-structure and lattice engineering. However, due to a large surface-to-volume ratio, III-V NWs suffer from severe non-radiative carrier recombination at/near NWs surfaces that significantly degrades optical quality. Here we show that increasing nitrogen composition in novel GaAs/GaNAs core/shell NWs can strongly suppress the detrimental surface recombination. This conclusion is based on our experimental finding that lifetimes of photo-generated free excitons and free carriers increase with increasing N composition, as revealed from our time-resolved photoluminescence (PL) studies. This is accompanied by a sizable enhancement in the PL intensity of the GaAs/GaNAs core/shell NWs at room temperature. The observed N-induced suppression of the surface recombination is concluded to be a result of an N-induced modification of the surface states that are responsible for the nonradiative recombination. Our results, therefore, demonstrate the great potential of incorporating GaNAs in III-V NWs to achieve efficient nano-scale light emitters.

Place, publisher, year, edition, pages
2015. Vol. 5, 11653
Keyword [en]
Semiconductors
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-118006DOI: 10.1038/srep11653ISI: 000356666100001OAI: oai:DiVA.org:liu-118006DiVA: diva2:812743
Available from: 2015-05-20 Created: 2015-05-20 Last updated: 2017-12-04

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Chen, Shula L.Chen, WeiminBuyanova, Irina A
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