Pulsed near-IR photoresponse in a bi-metal contacted graphene photodetector

Xinghan Cai, Ryan J Suess, H Dennis Drew, Thomas E Murphy, Jun Yan, Michael S Fuhrer

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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.
Original languageEnglish
Article number14803
Pages (from-to)1-7
Number of pages7
JournalScientific Reports
Publication statusPublished - 2015

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