Photoresponse in graphene field effect transistor under ultra-short pulsed laser irradiation

Aleksei V. Emelianov; Dmitry M. Kireev; Nerea Otero; Pablo Romero; Ivan I. Bobrinetskiy

doi:10.1117/12.2266470

30 December 2016 Photoresponse in graphene field effect transistor under ultra-short pulsed laser irradiation

Aleksei V. Emelianov; Dmitry M. Kireev; Nerea Otero; Pablo Romero; Ivan I. Bobrinetskiy

Author Affiliations +

Proceedings Volume 10224, International Conference on Micro- and Nano-Electronics 2016; 102240P (2016) https://doi.org/10.1117/12.2266470
Event: The International Conference on Micro- and Nano-Electronics 2016, 2016, Zvenigorod, Russian Federation

Abstract

We have developed the ultra-short pulsed laser processing methods for patterning of graphene field effect transistors in topological and chemical way. We investigated in details the photoresponse in graphene FETs before and after laser-induced modification for laser influence below threshold energy. We observed two different mechanisms of the photoresponse under ultra-short laser pulses (280 fs). The photocurrent, observed for both pristine and laser processed graphene is raised because the laser induced charge is transferred from graphene to trapped levels in SiO₂ surface resulting in electrostatic Dirac point shift. For laser oxidized areas we observed more pronounced photocurrent because of heterojunction formation in laser-processed area. While for electrostatic effect the relaxation time estimated as 50 seconds, the heterojunction relaxation was observed for less than 3 ms.

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Aleksei V. Emelianov, Aleksei V. Emelianov, Dmitry M. Kireev, Dmitry M. Kireev, Nerea Otero, Nerea Otero, Pablo Romero, Pablo Romero, Ivan I. Bobrinetskiy, Ivan I. Bobrinetskiy, } "Photoresponse in graphene field effect transistor under ultra-short pulsed laser irradiation", Proc. SPIE 10224, International Conference on Micro- and Nano-Electronics 2016, 102240P (30 December 2016); doi: 10.1117/12.2266470; https://doi.org/10.1117/12.2266470

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