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.

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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