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dc.contributor.authorAkhavan S.en_US
dc.contributor.authorYeltik, A.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2015-07-28T12:03:12Z
dc.date.available2015-07-28T12:03:12Z
dc.date.issued2014en_US
dc.identifier.issn1944-8244
dc.identifier.urihttp://hdl.handle.net/11693/12809
dc.description.abstractWe propose and demonstrate light-sensitive nanocrystal skins that exhibit broadband sensitivity enhancement based on electron transfer to a thin TiO2 film grown by atomic layer deposition. In these photosensors, which operate with no external bias, photogenerated electrons remain trapped inside the nanocrystals. These electrons generally recombine with the photogenerated holes that accumulate at the top interfacing contact, which leads to lower photovoltage buildup. Because favorable conduction band offset aids in transferring photoelectrons from CdTe nanocrystals to the TiO2 layer, which decreases the exciton recombination probability, TiO2 has been utilized as the electron-accepting material in these light-sensitive nanocrystal skins. A controlled interface thickness between the TiO2 layer and the monolayer of CdTe nanocrystals enables a photovoltage buildup enhancement in the proposed nanostructure platform. With TiO2 serving as the electron acceptor, we observed broadband sensitivity improvement across 350-475 nm, with an approximately 22% enhancement. Furthermore, time-resolved fluorescence measurements verified the electron transfer from the CdTe nanocrystals to the TiO2 layer in light-sensitive skins. These results could pave the way for engineering nanocrystal-based light-sensing platforms, such as smart transparent windows, light-sensitive walls, and large-area optical detection systems.en_US
dc.language.isoEnglishen_US
dc.source.titleACS Applied Materials and Interfacesen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/am502472yen_US
dc.subjectSemiconductor quantum dotsen_US
dc.subjectNanocrystalsen_US
dc.subjectTio2en_US
dc.subjectLight-sensingen_US
dc.subjectVoltage buildupen_US
dc.subjectSelf-assembled monolayersen_US
dc.subjectTime-resolved fluorescenceen_US
dc.titlePhotosensitivity enhancement with TiO2 in semitransparent light-sensitive skins of nanocrystal monolayersen_US
dc.typeArticleen_US
dc.departmentDepartment of Physicsen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnologyen_US
dc.citation.spage9023en_US
dc.citation.epage9028en_US
dc.citation.volumeNumber6en_US
dc.citation.issueNumber12en_US
dc.identifier.doi10.1021/am502472yen_US
dc.publisherAmerican Chemical Societyen_US
dc.contributor.bilkentauthorDemir, Hilmi Volkanen_US
dc.identifier.eissn1944-8252


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