Flexible and fragmentable tandem photosensitive nanocrystal skins

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage4503en_US
dc.citation.issueNumber8en_US
dc.citation.spage4495en_US
dc.citation.volumeNumber8en_US
dc.contributor.authorAkhavan S.en_US
dc.contributor.authorUran, C.en_US
dc.contributor.authorBozok, B.en_US
dc.contributor.authorGungor K.en_US
dc.contributor.authorKelestemur Y.en_US
dc.contributor.authorLesnyak, V.en_US
dc.contributor.authorGaponik N.en_US
dc.contributor.authorEychmüller A.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2018-04-12T10:48:39Z
dc.date.available2018-04-12T10:48:39Z
dc.date.issued2016en_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractWe proposed and demonstrated the first account of large-area, semi-transparent, tandem photosensitive nanocrystal skins (PNSs) constructed on flexible substrates operating on the principle of photogenerated potential buildup, which avoid the need for applying an external bias and circumvent the current-matching limitation between junctions. We successfully fabricated and operated the tandem PNSs composed of single monolayers of colloidal water-soluble CdTe and CdHgTe nanocrystals (NCs) in adjacent junctions on a Kapton polymer tape. Owing to the usage of a single NC layer in each junction, noise generation was significantly reduced while keeping the resulting PNS films considerably transparent. In each junction, photogenerated excitons are dissociated at the interface of the semi-transparent Al electrode and the NC layer, with holes migrating to the contact electrode and electrons trapped in the NCs. As a result, the tandem PNSs lead to an open-circuit photovoltage buildup equal to the sum of those of the two single junctions, exhibiting a total voltage buildup of 128.4 mV at an excitation intensity of 75.8 μW cm-2 at 350 nm. Furthermore, we showed that these flexible PNSs could be bent over 3.5 mm radius of curvature and cut out in arbitrary shapes without damaging the operation of individual parts and without introducing any significant loss in the total sensitivity. These findings indicate that the NC skins are promising as building blocks to make low-cost, flexible, large-area UV/visible sensing platforms with highly efficient full-spectrum conversion.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T10:48:39Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2016en
dc.identifier.doi10.1039/c5nr05063den_US
dc.identifier.issn2040-3364
dc.identifier.urihttp://hdl.handle.net/11693/36690
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttp://dx.doi.org/10.1039/c5nr05063den_US
dc.source.titleNanoscaleen_US
dc.subjectElectrodesen_US
dc.subjectHeterojunctionsen_US
dc.subjectLight sensitive materialsen_US
dc.subjectPhotosensitivityen_US
dc.subjectContact electrodesen_US
dc.subjectExcitation intensityen_US
dc.subjectFlexible substrateen_US
dc.subjectNanocrystal (NCs)en_US
dc.subjectOpen-circuit photovoltageen_US
dc.subjectPhotogenerated excitonsen_US
dc.subjectRadius of curvatureen_US
dc.subjectSensing platformsen_US
dc.subjectNanocrystalsen_US
dc.titleFlexible and fragmentable tandem photosensitive nanocrystal skinsen_US
dc.typeArticleen_US

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Department of Physics
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