dc.contributor.author
Chen, Weijian
dc.contributor.author
Wen, Xiaoming
dc.contributor.author
Yang, Jianfeng
dc.contributor.author
Latzel, Michael
dc.contributor.author
Patterson, Robert
dc.contributor.author
Huang, Shujuan
dc.contributor.author
Shrestha, Santosh
dc.contributor.author
Jia, Baohua
dc.contributor.author
Moss, David J.
dc.contributor.author
Christiansen, Silke H.
dc.date.accessioned
2020-02-14T09:48:53Z
dc.date.available
2020-02-14T09:48:53Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/26671
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-26428
dc.description.abstract
InGaN/GaN multiple quantum well (MQW) nanorods have demonstrated significantly improved optical and electronic properties compared to their planar counterparts. However, the exact nature of the processes whereby nanorod structures impact the optical properties of quantum wells is not well understood, even though a variety of mechanisms have been proposed. We performed nanoscale spatially resolved, steady-state, and time-resolved photoluminescence (PL) experiments confirming that photoexcited electrons and holes are strongly bound by Coulomb interactions (i.e., excitons) in planar MQWs due to the large exciton binding energy in InGaN quantum wells. In contrast, free electron–hole recombination becomes the dominant mechanism in nanorods, which is ascribed to efficient exciton dissociation. The nanorod sidewall provides an effective pathway for exciton dissociation that significantly improves the optical performance of InGaN/GaN MQWs. We also confirm that surface treatment of nanorod sidewalls has an impact on exciton dissociation. Our results provide new insights into excitonic and charge carrier dynamics of quantum confined materials as well as the influence of surface states.
en
dc.format.extent
8 Seiten
dc.rights.uri
http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen
dc.subject
multiple quantum well
en
dc.subject
photoluminescence investigation
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::530 Physik::530 Physik
dc.title
Free charges versus excitons: photoluminescence investigation of InGaN/GaN multiple quantum well nanorods and their planar counterparts
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.doi
10.1039/C7NR07567G
dcterms.bibliographicCitation.journaltitle
Physical chemistry, chemical physics
dcterms.bibliographicCitation.number
11
dcterms.bibliographicCitation.pagestart
5358
dcterms.bibliographicCitation.pageend
5365
dcterms.bibliographicCitation.volume
10
dcterms.bibliographicCitation.url
https://doi.org/10.1039/C7NR07567G
refubium.affiliation
Physik
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.issn
1463-9076
dcterms.isPartOf.eissn
1463-9084