Room-temperature larger-scale highly ordered nanorod imprints of ZnO film

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buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage26853en_US
dc.citation.issueNumber22en_US
dc.citation.spage26846en_US
dc.citation.volumeNumber21en_US
dc.contributor.authorKyaw, Z.en_US
dc.contributor.authorWang J.en_US
dc.contributor.authorDev, K.en_US
dc.contributor.authorTiam Tan, S.en_US
dc.contributor.authorJu, Z.en_US
dc.contributor.authorZhang, Z.-H.en_US
dc.contributor.authorJi, Y.en_US
dc.contributor.authorHasanov, N.en_US
dc.contributor.authorLiu W.en_US
dc.contributor.authorSun X.W.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2016-02-08T12:06:30Z
dc.date.available2016-02-08T12:06:30Z
dc.date.issued2013en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractRoom-temperature large-scale highly ordered nanorod-patterned ZnO films directly integrated on III-nitride light-emitting diodes (LEDs) are proposed and demonstrated via low-cost modified nanoimprinting, avoiding a high-temperature process. with a 600 nm pitch on top of a critical 200 nm thick Imprinting ZnO nanorods of 200 nm in diameter and 200 nm in height continuous ZnO wetting layer, the light output power of the resulting integrated ZnO-nanorod-film/semi- transparent metal/GaN/InGaN LED shows a two-fold enhancement (100% light extraction efficiency improvement) at the injection current of 150 mA, in comparison with the conventional LED without the imprint film. The increased optical output is well explained by the enhanced light scattering and outcoupling of the ZnOrod structures along with the wetting film, as verified by the numerical simulations. The wetting layer is found to be essential for better impedance matching. The current-voltage characteristics and electroluminescence measurements confirm that there is no noticeable change in the electrical or spectral properties of the final LEDs after ZnO-nanorod film integration. These results suggest that the low-cost high-quality large-scale ZnOnanorod imprints hold great promise for superior LED light extraction. ©2013 Optical Society of America.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T12:06:30Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2013en
dc.identifier.doi10.1364/OE.21.026846en_US
dc.identifier.issn1094-4087
dc.identifier.urihttp://hdl.handle.net/11693/27957
dc.language.isoEnglishen_US
dc.publisherOptical Society of American (OSA)en_US
dc.relation.isversionofhttp://dx.doi.org/10.1364/OE.21.026846en_US
dc.source.titleOptics Expressen_US
dc.subjectElectric propertiesen_US
dc.subjectElectroluminescenceen_US
dc.subjectMetallic filmsen_US
dc.subjectNanoimprint lithographyen_US
dc.subjectNanorodsen_US
dc.subjectWettingen_US
dc.subjectZinc oxideen_US
dc.subjectHigh temperature processen_US
dc.subjectInjection currentsen_US
dc.subjectLight output poweren_US
dc.subjectLight-extraction efficiencyen_US
dc.subjectNano-imprintingen_US
dc.subjectRoom temperatureen_US
dc.subjectSpectral propertiesen_US
dc.subjectTransparent metalsen_US
dc.subjectLight emitting diodesen_US
dc.titleRoom-temperature larger-scale highly ordered nanorod imprints of ZnO filmen_US
dc.typeArticleen_US

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