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.
*This work was supported by the US Office of Naval Research (N00014-16-1-2674) and the NSF (ECCS-1610953).
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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
