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

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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.date.issued2018-03-28
dc.date.updated2019-07-28T08:19:11Z
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.en_AU
dc.description.sponsorshipThe Australian Research Council (ARC) and the Engineering and Physical Sciences Research Council (EPSRC) are acknowledged for their financial supports.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn1648-8504en_AU
dc.identifier.urihttp://hdl.handle.net/1885/193744
dc.language.isoen_AUen_AU
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)en_AU
dc.publisherLietuvos Mokslu Akademijos Leidyklaen_AU
dc.rights© 2018 Lietuvos mokslų akademijaen_AU
dc.sourceLithuanian Journal of Physicsen_AU
dc.subjectGaAsen_AU
dc.subjectnanowire devicesen_AU
dc.subjectultrafast spectroscopyen_AU
dc.titleDistinguishing cap and core contributions to the photoconductive terahertz response of single GaAs based core–shell–cap nanowire detectorsen_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
dcterms.dateAccepted2018-03-22
local.bibliographicCitation.issue1en_AU
local.bibliographicCitation.lastpage23en_AU
local.bibliographicCitation.startpage15en_AU
local.contributor.affiliationPeng, Kun, College of Science, ANUen_AU
local.contributor.affiliationParkinson, Patrick, University of Manchesteren_AU
local.contributor.affiliationFu, Lan, College of Science, ANUen_AU
local.contributor.affiliationGao, Qian, College of Science, ANUen_AU
local.contributor.affiliationBoland, Jessica L., University of Oxforden_AU
local.contributor.affiliationGuo, Yanan, College of Science, ANUen_AU
local.contributor.affiliationJiang, Nian (Jenny), Joint Colleges of Science, ANUen_AU
local.contributor.affiliationTan, Hoe Hark, College of Science, ANUen_AU
local.contributor.affiliationJohnston, Michael B, University of Oxforden_AU
local.contributor.affiliationJagadish, Chennupati, College of Science, ANUen_AU
local.contributor.authoremailu9715386@anu.edu.auen_AU
local.contributor.authoruidPeng, Kun, u5096262en_AU
local.contributor.authoruidFu, Lan, u9715386en_AU
local.contributor.authoruidGao, Qian, u4944777en_AU
local.contributor.authoruidGuo, Yanan, u5438092en_AU
local.contributor.authoruidJiang, Nian (Jenny), u4902336en_AU
local.contributor.authoruidTan, Hoe Hark, u9302338en_AU
local.contributor.authoruidJagadish, Chennupati, u9212349en_AU
local.description.notesImported from ARIESen_AU
local.identifier.absfor020406 - Surfaces and Structural Properties of Condensed Matteren_AU
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciencesen_AU
local.identifier.ariespublicationU3594520xPUB702en_AU
local.identifier.citationvolume58en_AU
local.identifier.doi10.3952/physics.v58i1.3648en_AU
local.identifier.uidSubmittedByU3594520en_AU
local.publisher.urlhttps://www.lmaleidykla.lten_AU
local.type.statusPublished Versionen_AU

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