Effects of Polytypism on Optical Properties and Band Structure ofIndividual Ga(N)P Nanowires from Correlative Spatially Resolved Structural and Optical Studies

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Dobrovolskiy, AlexanderLinköpings universitet,Funktionella elektroniska material,Tekniska högskolan (författare)

Effects of Polytypism on Optical Properties and Band Structure ofIndividual Ga(N)P Nanowires from Correlative Spatially Resolved Structural and Optical Studies

Artikel/kapitelEngelska2015

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2015-05-22
American Chemical Society (ACS),2015
printrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:liu-118623
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118623URI
https://doi.org/10.1021/acs.nanolett.5b01054DOI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:ref swepub-contenttype
Ämneskategori:art swepub-publicationtype

Anmärkningar

III-V semiconductor nanowires (NWs) have gained significant interest as building blocks in novel nanoscale devices. The one-dimensional (1D) nanostructure architecture allows one to extend band structure engineering beyond quantum confinement effects by utilizing formation of different crystal phases that are thermodynamically unfavorable in bulk materials. It is therefore of crucial importance to understand the influence of variations in the NWs crystal structure on their fundamental physical properties. In this work we investigate effects of structural polytypism on the optical properties of gallium phosphide and GaP/GaNP core/shell NW structures by a correlative investigation on the structural and optical properties of individual NWs. The former is monitored by transmission electron microscopy, whereas the latter is studied via cathodoluminescence (CL) mapping. It is found that structural defects, such as rotational twins in zinc blende (ZB) GaNP, have detrimental effects on light emission intensity at low temperatures by promoting nonradiative recombination processes. On the other hand, formation of the wurtzite (WZ) phase does not notably affect the CL intensity neither in GaP nor in the GaNP alloy. This suggests that zone folding in WZ GaP does not enhance its radiative efficiency, consistent with theoretical predictions. We also show that the change in the lattice structure have negligible effects on the bandgap energies of the GaNP alloys, at least within the range of the investigated nitrogen compositions of <2%. Both WZ and ZB GaNP are found to have a significantly higher efficiency of radiative recombination as compared with that in parental GaP, promising for potential applications of GaNP NWs as efficient nanoscale light emitters within the desirable amber-red spectral range.

Ämnesord och genrebeteckningar

NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
Gallium phosphide; GaNP; nanowire; wurtzite; electronic structure

Biuppslag (personer, institutioner, konferenser, titlar ...)

Persson, Per O. ÅLinköpings universitet,Tunnfilmsfysik,Tekniska högskolan(Swepub:liu)perpe25 (författare)
Sukrittanon, SupaneeGraduate Program of Materials Science and Engineering, University of California, La Jolla, California 92093, United States (författare)
Kuang, YanjinDepartment of Physics, University of California, La Jolla, California 92093, United States (författare)
Tu, CHarles W.Department of Electrical and Computer Engineering, University of California, La Jolla, California 92093, United States (författare)
Chen, WeiminLinköpings universitet,Funktionella elektroniska material,Tekniska högskolan(Swepub:liu)weich55 (författare)
Buyanova, IrinaLinköpings universitet,Funktionella elektroniska material,Tekniska högskolan(Swepub:liu)iribo40 (författare)
Linköpings universitetFunktionella elektroniska material (creator_code:org_t)

Sammanhörande titlar

Ingår i:Nano letters (Print): American Chemical Society (ACS)15:6, s. 4052-40581530-69841530-6992

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Av författaren/redakt...: Dobrovolskiy, Al ...; Persson, Per O. ...; Sukrittanon, Sup ...; Kuang, Yanjin; Tu, CHarles W.; Chen, Weimin; visa fler...; Buyanova, Irina; visa färre...

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NATURVETENSKAP: NATURVETENSKAP; och Fysik; och Den kondenserade ...

Artiklar i publikationen: Nano letters (Pr ...

Av lärosätet: Linköpings universitet

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