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CdSe–Graphene Oxide Light-Harvesting Assembly: Size-Dependent Electron Transfer and Light Energy Conversion Aspects

Authors

  • Sachidananda Krishnamurthy,

    1. Department of Chemistry and Biochemistry and Radiation Laboratory, University of Notre Dame, Notre Dame, IN 46556 (USA), Fax: (+1) 520 631-8068
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  • Dr. Prashant V. Kamat

    Corresponding author
    1. Department of Chemistry and Biochemistry and Radiation Laboratory, University of Notre Dame, Notre Dame, IN 46556 (USA), Fax: (+1) 520 631-8068
    2. Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556 (USA)
    • Department of Chemistry and Biochemistry and Radiation Laboratory, University of Notre Dame, Notre Dame, IN 46556 (USA), Fax: (+1) 520 631-8068===

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Abstract

Excited-state interaction between CdSe quantum dots (QDs) of different sizes (2.3, 3.2, and 4.2 nm diameter) and graphene oxide (GO) was probed by depositing them as films on conducting glass electrodes. The emission of smaller CdSe QDs (2.3 nm) was quenched by GO three times faster than that of larger QDs (4.2 nm). Electrophoretic deposition allowed us to sequentially deposit single or multiple layers of different sized QDs and GO assemblies on conducting glass electrodes and to modulate the photoresponse in photoelectrochemical solar cells. Superior photoconversion efficiency through the incorporation of GO was attributed to improved charge separation in the composite assembly.

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