The role of defects in the performance of graphene hot-electron devices.

ORAL

Abstract

Defect-mediated electron-phonon collisions (supercollisions) play an important role in the cooling dynamics of hot electrons in graphene, but their impact on the performance of optoelectonic devices is still largely unexplored. Here we study supercollisions in hot-electron bolometers based on quantum dots of epitaxial graphene grown on SiC. We find that the fabrication process substantially affects the defect density and that a higher defect density greatly enhances the device performance, yielding faster response time and lower thermal conductance in a wide range of power and temperature.

–

Presenters

  • Paola Barbara

    Georgetown University, Physics, Georgetown University

Authors

  • A El Fatimy

    Georgetown University, Physics, Georgetown University

  • Peize Han

    Physics, Georgetown University

  • Luke St. Marie

    Georgetown University, Physics, Georgetown University

  • Nicholas Quirk

    Princeton University, Physics, Princeton University

  • Matthew T Dejarld

    ASEE Research Fellow at U.S. Naval Research Laboratory, 4555 Overlook Ave SW, Washington DC 20375, USA, US Naval Research Laboratory

  • Rachael Myers-Ward

    US Naval Research Laboratory, Electronics Science & Technology Division, U.S. Naval Research Laboratory, 4555 Overlook Ave SW, Washington DC 20375, USA

  • Kevin Daniels

    Electrical and Computer Engineering, University of Maryland

  • Shojan Pavunny

    US Naval Research Laboratory

  • David Kurt Gaskill

    US Naval Research Laboratory

  • Yigit Aytac

    University of Maryland College Park, Electrical and Computer Engineering, University of Maryland

  • Thomas E Murphy

    University of Maryland-College Park, Electrical and Computer Engineering, University of Maryland

  • Paola Barbara

    Georgetown University, Physics, Georgetown University