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Distinguishing cap and core contributions to the photoconductive terahertz response of single GaAs based core–shell–cap nanowire detectors

Peng, Kun; Parkinson, Patrick; Fu, Lan; Gao, Qian; Boland, Jessica L.; Guo, Yanan; Jiang, Nian; Tan, Hark Hoe; Johnston, Michael B; Jagadish, Chennupati

Description

GaAs nanowires are promising candidates for advanced optoelectronic devices, despite their high surface recombination velocity and large surface-area-to-volume ratio, which renders them problematic for applications that require efficient charge collection and long charge-carrier lifetimes. Overcoating a bare GaAs nanowire core with an optimized larger-bandgap AlGaAs shell, followed by a capping layer of GaAs to prevent oxidation, has proven an effective way to passivate the nanowire surface and...[Show more]

dc.contributor.authorPeng, Kun
dc.contributor.authorParkinson, Patrick
dc.contributor.authorFu, Lan
dc.contributor.authorGao, Qian
dc.contributor.authorBoland, Jessica L.
dc.contributor.authorGuo, Yanan
dc.contributor.authorJiang, Nian
dc.contributor.authorTan, Hark Hoe
dc.contributor.authorJohnston, Michael B
dc.contributor.authorJagadish, Chennupati
dc.date.accessioned2019-12-12T04:48:44Z
dc.date.available2019-12-12T04:48:44Z
dc.identifier.issn1648-8504
dc.identifier.urihttp://hdl.handle.net/1885/193744
dc.description.abstractGaAs nanowires are promising candidates for advanced optoelectronic devices, despite their high surface recombination velocity and large surface-area-to-volume ratio, which renders them problematic for applications that require efficient charge collection and long charge-carrier lifetimes. Overcoating a bare GaAs nanowire core with an optimized larger-bandgap AlGaAs shell, followed by a capping layer of GaAs to prevent oxidation, has proven an effective way to passivate the nanowire surface and thereby improve electrical properties for enhanced device performance. However, it is difficult to quantify and distinguish the contributions between the nanowire core and cap layer when measuring the optoelectronic properties of a nanowire device. Here, we investigated the photoconductive terahertz (THz) response characteristics of single GaAs/AlGaAs/GaAs core–shell–cap nanowire detectors designed for THz time-domain spectroscopy. We present a detailed study of the contributions of the GaAs cap layer and GaAs core on the ultrafast optoelectronic performance of the detector. We show that both the GaAs cap and core contribute to the photoconductive signal in proportion to their relative volume in the nanowire. By increasing the cap volume ratio to above 90% of the total GaAs volume, a quasi-direct-sampling type photoconductive nanowire detector can be achieved that is highly desirable for low-noise and fast data acquisition detection.
dc.description.sponsorshipThe Australian Research Council (ARC) and the Engineering and Physical Sciences Research Council (EPSRC) are acknowledged for their financial supports.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherLietuvos Mokslu Akademijos Leidykla
dc.rights© 2018 Lietuvos mokslų akademija
dc.sourceLithuanian Journal of Physics
dc.subjectGaAs
dc.subjectnanowire devices
dc.subjectultrafast spectroscopy
dc.titleDistinguishing cap and core contributions to the photoconductive terahertz response of single GaAs based core–shell–cap nanowire detectors
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume58
dcterms.dateAccepted2018-03-22
dc.date.issued2018-03-28
local.identifier.absfor020406 - Surfaces and Structural Properties of Condensed Matter
local.identifier.ariespublicationU3594520xPUB702
local.publisher.urlhttps://www.lmaleidykla.lt
local.type.statusPublished Version
local.contributor.affiliationPeng, Kun, College of Science, ANU
local.contributor.affiliationParkinson, Patrick, University of Manchester
local.contributor.affiliationFu, Lan, College of Science, ANU
local.contributor.affiliationGao, Qian, College of Science, ANU
local.contributor.affiliationBoland, Jessica L., University of Oxford
local.contributor.affiliationGuo, Yanan, College of Science, ANU
local.contributor.affiliationJiang, Nian (Jenny), Joint Colleges of Science, ANU
local.contributor.affiliationTan, Hoe Hark, College of Science, ANU
local.contributor.affiliationJohnston, Michael B, University of Oxford
local.contributor.affiliationJagadish, Chennupati, College of Science, ANU
local.bibliographicCitation.issue1
local.bibliographicCitation.startpage15
local.bibliographicCitation.lastpage23
local.identifier.doi10.3952/physics.v58i1.3648
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2019-07-28T08:19:11Z
dcterms.accessRightsOpen Access
dc.provenancehttps://www.lmaleidykla.lt/ojs/index.php/physics/about..."This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge." (as at 12/12/19)
CollectionsANU Research Publications

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