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Increasing N content in GaNAsP nanowires suppresses the impact of polytypism on luminescence
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-5751-6225
Ecole Polytech Fed Lausanne, Switzerland.
Univ Calif San Diego, CA 92093 USA.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 30, no 40, article id 405703Article in journal (Refereed) Published
Abstract [en]

Cathodoluminescence (CL) and micro-photoluminescence spectroscopies are employed to investigate effects of structural defects on carrier recombination in GaNAsP nanowires (NWs) grown by molecular beam epitaxy on Si substrates. In the NWs with a low N content of 0.08%, these defects are found to promote non-radiative (NR) recombination, which causes spatial variation of the CL peak position and its intensity. Unexpectedly, these detrimental effects can be suppressed even by a small increase in the nitrogen composition from 0.08% to 0.12%. This is attributed to more efficient trapping of excited carriers/excitons to the localized states promoted by N-induced localization and also the presence of other NR channels At room temperature, the structural defects no longer dominate in carrier recombination even in the NWs with the lower nitrogen content, likely due to increasing importance of other recombination channels. Our work underlines the need in eliminating important thermally activated NR defects, other than the structural defects, for future optoelectronic applications of these NWs.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 30, no 40, article id 405703
Keywords [en]
nanowires; polytypism; dilute nitrides; stacking faults; twinning
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-159226DOI: 10.1088/1361-6528/ab2cdbISI: 000476604600003PubMedID: 31242464OAI: oai:DiVA.org:liu-159226DiVA, id: diva2:1341867
Note

Funding Agencies|Linkoping University; Swedish Research Council [2016-05091]; Swedish Energy Agency [P40119-1]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]; Swiss National Foundation through the NCCR QSIT

Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-11-15

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