Electrostatic built-in fields in wurtzite III-N nanostructures: impact of growth plane on second-order piezoelectricity

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dc.contributor.authorPatra, Saroj K.
dc.contributor.authorSchulz, Stefan
dc.contributor.funderScience Foundation Ireland
dc.date.accessioned2018-09-24T12:36:59Z
dc.date.available2018-09-24T12:36:59Z
dc.date.issued2017
dc.description.abstractIn this work we present a detailed analysis of the second-order piezoelectric effect in wurtzite III-N heterostructures, such as quantum wells and quantum dots, grown on different substrate orientations. Our analysis is based on a continuum model using a here derived analytic expression for the second-order piezoelectric polarization vector field as a function of the incline angle theta to the wurtzite c axis. This expression allows for a straightforward implementation in existing quantum well and quantum dot codes. Our calculations on III-N quantum well systems reveal that especially for semipolar structures with high incline angle values (55 degrees <= theta <= 80 degrees and 105 degrees <= theta <= 120 degrees), second-order piezoelectricity noticeably contributes to the overall electric built-in field. For instance, in an InGaN/GaN multiple quantum well system with 22% In, the electric field increases by approximately 20% due to second-order piezoelectricity. Overall, when including second-order piezoelectric effects in the calculation of electric fields in GaN/AlN and InGaN/GaN quantum well systems an improved agreement between our theory and experimental literature data is observed. When studying quantum dots, at least for the here considered model geometry and growth planes, we observe that for GaN/AlN structures second-order effects are of secondary importance. The situation is different for non-c-plane In0.2Ga0.8N/GaN quantum dots. For example, inside a nonpolar In0.2Ga0.8N/GaN dot the built-in potential arising from second-order piezoelectricity is comparable in magnitude to the built-in potential originating from spontaneous and first-order piezoelectric polarization, but opposite in sign. This feature leads to a change in the built-in potential profile both in and around the In0.2Ga0.8N/GaN quantum dot structure, which in general is relevant for electronic and optical properties of these systems.en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid155307
dc.identifier.citationPatra, S. K. and Schulz, S. (2017) 'Electrostatic built-in fields in wurtzite III-N nanostructures: Impact of growth plane on second-order piezoelectricity', Physical Review B, 96(15), 155307 (15pp). doi: 10.1103/PhysRevB.96.155307en
dc.identifier.doi10.1103/PhysRevB.96.155307
dc.identifier.endpage15
dc.identifier.issn2469-9950
dc.identifier.issued15
dc.identifier.journaltitlePhysical Review Ben
dc.identifier.startpage1
dc.identifier.urihttps://hdl.handle.net/10468/6879
dc.identifier.volume96
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Starting Investigator Research Grant (SIRG)/13/SIRG/2210/IE/Shaping the electronic and optical properties of non- and semi-polar nitride-based semiconductor nanostructures/
dc.relation.urihttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.155307
dc.rights©2017, American Physical Societyen
dc.subjectLight-emitting-diodesen
dc.subjectMolecular-beam epitaxyen
dc.subjectGan/aln quantum-wellsen
dc.subjectOptical-propertiesen
dc.subjectElectronic-structureen
dc.subjectGallium-nitrideen
dc.subjectV nitridesen
dc.subjectDotsen
dc.subjectPolarizationen
dc.subjectNonpolaren
dc.titleElectrostatic built-in fields in wurtzite III-N nanostructures: impact of growth plane on second-order piezoelectricityen
dc.typeArticle (peer-reviewed)en
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