Characterization of graphene quantum dot hybrid structures

ORAL

Abstract

We report electrical transport, photo-electric response and Raman spectroscopy measurements in macroscopic samples of graphene decorated with inorganic quantum dots (CdSe QDs). QDs are deposited on chemical vapor deposition (CVD) graphene by spin-coating. Raman measurements of graphene decorated with QDs on Si wafer show very similar spectra with clear G and 2D peaks that reveal no degradation of graphene during the QDs deposition process. Furthermore, two types of device architectures (QDs-graphene and graphene-QDs-graphene) are fabricated with graphene as a transparent electrode and QD as a light absorbent for electrical photoresponse characterization. Upon application of either a broadband light source or a 532-nm monochromatic laser source, graphene-QDs-graphene devices demonstrate photoconducting response, but not in the case of QDs-graphene devices.

*This work is partially supported by Day \& Associate LLC.

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Authors

  • Ting-Fung Chung

    • Purdue University

  • Jiuning Hu

    • Purdue University

  • Luis A. Jauregui

    • Purdue University

  • Liangliang Chen

    • Purdue University

  • Qing Zhao

    • Purdue University

  • Xiulin Ruan

    • Purdue University

  • Yong Chen

    • Purdue University
    • Physics department, Birck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907
    • Department of Physics and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907
    • Department of Physics, Purdue University