Pulsed Near-IR Photoresponse in a Bi-metal Contacted Graphene Photodetector

Published/Posted: October 14, 2015

Authors: Cai, X.; Suess, R. J.; Drew, H. D.; Murphy, T. E.; Yan, J.; Fuhrer, M. S.

DOI: 10.1038/srep14803

Abstract: We use an ultra-fast near-infrared pulse coincidence technique to study the time, temperature, and power dependence of the photoresponse of a bi-metal contacted graphene photodetector. We observe two components of the photovoltage signal. One component is gate-voltage dependent, linear in power at room temperature and sub-linear at low temperature-consistent with the hot-electron photothermoelectric effect due to absorption in the graphene. The power dependence is consistent with supercollision-dominated cooling in graphene. The other component is gate-voltage independent and linear in temperature and power, which we interpret as due to thermoelectricity of the metal electrodes due to differential light absorption.

Citation:
X. Cai, R. J. Suess, H. D. Drew, T. E. Murphy, J. Yan and M. S. Fuhrer, "Pulsed Near-IR Photoresponse in a Bi-metal Contacted Graphene Photodetector", Sci. Rep. 514803 (2015)
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Manuscript: Cai_SciRep_5_14803_2015.pdf

Posted in 2D Materials, Graphene, Nanoscience, Nonlinear Optics