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      Colloidal nanoplatelet/conducting polymer hybrids: excitonic and material properties

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      Author(s)
      Guzelturk, B.
      Menk, F.
      Philipps, K.
      Kelestemur Y.
      Olutas M.
      Zentel, R.
      Demir, Hilmi Volkan
      Date
      2016
      Source Title
      Journal of Physical Chemistry C
      Print ISSN
      1932-7447
      Publisher
      American Chemical Society
      Volume
      120
      Issue
      6
      Pages
      3573 - 3582
      Language
      English
      Type
      Article
      Item Usage Stats
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      261
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      Abstract
      Here we present the first account of conductive polymer/colloidal nanoplatelet hybrids. For this, we developed DEH-PPV-based polymers with two different anchor groups (sulfide and amine) acting as surfactants for CdSe nanoplatelets, which are atomically flat semiconductor nanocrystals. Hybridization of the polymers with the nanoplatelets in the solution phase was observed to cause strong photoluminescence quenching in both materials. Through steady-state photoluminescence and excitation spectrum measurements, photoluminescence quenching was shown to result from dominant exciton dissociation through charge transfer at the polymer/nanoplatelet interfaces that possess a staggered (i.e., type II) band alignment. Importantly, we found out that sulfide-based anchors enable a stronger emission quenching than amine-based ones, suggesting that the sulfide anchors exhibit more efficient binding to the nanoplatelet surfaces. Also, shorter surfactants were found to be more effective for exciton dissociation as compared to the longer ones. In addition, we show that nanoplatelets are homogeneously distributed in the hybrid films owing to the functional polymers. These nanocomposites can be used as building blocks for hybrid optoelectronic devices, such as solar cells.
      Keywords
      Anchors
      Charge transfer
      Dissociation
      Excited states
      Excitons
      Interface states
      Optoelectronic devices
      Photoluminescence
      Quenching
      Surface active agents
      Building blockes
      Conductive polymer
      Emission quenching
      Excitation spectrum
      Exciton dissociation
      Hybrid optoelectronic devices
      Photoluminescence quenching
      Semiconductor nanocrystals
      Sulfur compounds
      Permalink
      http://hdl.handle.net/11693/36741
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/acs.jpcc.5b12661
      Collections
      • Department of Electrical and Electronics Engineering 3863
      • Department of Physics 2485
      • Institute of Materials Science and Nanotechnology (UNAM) 2098
      • Nanotechnology Research Center (NANOTAM) 1125
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