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Organic Dye Graphene Hybrid Structures with Spectral Color Selectivity

Title
Organic Dye Graphene Hybrid Structures with Spectral Color Selectivity
Authors
Gim, YS[Gim, Yu Seong]Lee, Y[Lee, Youngbin]Kim, S[Kim, Soo]Hao, SQ[Hao, Shiqiang]Kang, MS[Kang, Moon Sung]Yoo, WJ[Yoo, Won Jong]Kim, H[Kim, Hyunmin]Wolverton, C[Wolverton, Chris]Cho, JH[Cho, Jeong Ho]
DGIST Authors
Kim, H[Kim, Hyunmin]
Issue Date
2016-09
Citation
Advanced Functional Materials, 26(36), 6593-6600
Type
Article
Article Type
Article
Keywords
Absorption SpectroscopyCharge TransferColorColor SelectivityDensity Functional TheoryElectromagnetic Wave AbsorptionEnergy GapGrapheneHybrid Photo DetectorsLightLight AbsorptionMoleculesOptical Band WidthOptical FunctionalitiesOrganic DyeOrganic Dye MoleculesPhotodetectorPhotodetectorsPhotonsTransport MeasurementsUltraviolet SpectroscopyUV-Visible Absorption Spectroscopy
ISSN
1616-301X
Abstract
This study characterizes a hybrid structure formed between graphene and organic dye molecules for use in photodetectors with spectral color selectivity. Rhodamine-based organic dye molecules with red, green, or blue light absorption profiles are deposited onto a graphene surface by dip-coating. UV–vis absorption spectroscopy, charge transport measurements, and density functional theory based calculations reveal that the photoresponses of the dye graphene hybrid films are governed by the light absorption of the dye molecules and also by the photo-excited-charge-transfer-induced photocurrent gain. The hybrid films respond only to photons with an energy exceeding the band gap of the immobilized dye. Dye-Graphene charge transfer is affected by the distance and direction of the dipole moment between the two layers. The resulting hybrid films exhibit spectral color selectivities with responsivities of ≈103 A W−1 and specific detectivities of ≈1010 Jones. This study demonstrates the successful operation of photodetectors with a full-color optical bandwidth using hybrid graphene structures coated with a mixture of dyes. The strategy of building a simple hybrid photodetector can further offer many opportunities to be also tuned for other optical functionalities using a variety of commercially available dye molecules. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
http://hdl.handle.net/20.500.11750/2209
DOI
10.1002/adfm.201601200
Publisher
Wiley-VCH Verlag
Related Researcher
Files:
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Collection:
Companion Diagnostics and Medical Technology Research Group1. Journal Articles


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