Competing Mechanisms for Photocurrent Induced at the Monolayer-Multilayer Graphene Junction

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Youwei ZhangZhi-Jun Qiu

Abstract

Graphene is characterized by demonstrated unique properties for potential novel applications in photodetection operated in the frequency range from ultraviolet to terahertz. To date, detailed work on identifying the origin of photoresponse in graphene is still ongoing. Here, scanning photocurrent microscopy to explore the nature of photocurrent generated at the monolayer-multilayer graphene junction is employed. It is found that the contributing photocurrent mechanism relies on the mismatch of the Dirac points between the monolayer and multilayer graphene. For overlapping Dirac points, only photothermoelectric effect (PTE) is observed at the junction. When they do not coincide, a different photocurrent due to photovoltaic effect (PVE) appears and becomes more pronounced with larger separation of the Dirac points. While only PTE is reported for a monolayer-bilayer graphene junction in the literature, this work confirms the coexistence of PTE and PVE, thereby extending the understanding of photocurrent in graphene-based heterojunctions.

References

Oct 23, 2004·Science·K S NovoselovA A Firsov
Mar 10, 2005·Nano Letters·Kannan BalasubramanianAlf Mews
Dec 13, 2006·Physical Review Letters·A C FerrariA K Geim
Jun 15, 2007·Nano Letters·Marcus FreitagPhaedon Avouris
Feb 21, 2008·Nano Letters·Alexander A BalandinChun Ning Lau
Mar 15, 2008·Science·Feng WangY Ron Shen
Aug 8, 2008·Nature Nanotechnology·Eduardo J H LeeKlaus Kern
Feb 11, 2009·Nano Letters·Fengnian XiaPhaedon Avouris
Jun 13, 2009·Physical Review Letters·R Bistritzer, A H MacDonald
Nov 7, 2009·Nature Nanotechnology·Fengnian XiaPhaedon Avouris
Dec 30, 2009·Nano Letters·Xiaodong XuPaul L McEuen
Sep 2, 2011·Nano Letters·Max C LemmeCharles M Marcus
Sep 23, 2011·Nano Letters·Justin C W SongLeonid S Levitov
Oct 8, 2011·Science·Nathaniel M GaborPablo Jarillo-Herrero
Apr 20, 2012·ACS Nano·Qiaoliang Bao, Kian Ping Loh
May 31, 2012·Nano Letters·A Castellanos-GomezG A Steele
Sep 26, 2012·Physical Review Letters·Justin C W SongLeonid S Levitov
Sep 26, 2012·Physical Review Letters·A C BetzE Pallecchi
Jan 11, 2013·Nano Letters·Michele BuscemaAndres Castellanos-Gomez
Feb 27, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·T Winzer, E Malic
Mar 5, 2013·Nano Letters·Marcus FreitagPhaedon Avouris
Jan 8, 2014·Nano Letters·Patrick K HerringPablo Jarillo-Herrero
Apr 10, 2014·Advanced Materials·Jinhua LiFeng Yan
Jul 6, 2014·Physical Review Letters·Qiong MaPablo Jarillo-Herrero
Sep 10, 2014·Nature Nanotechnology·Xinghan CaiMichael S Fuhrer
Oct 7, 2014·Nature Nanotechnology·F H L KoppensM Polini
Jan 22, 2015·Scientific Reports·Youwei ZhangZhi-Jun Qiu
Apr 4, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·K J TielrooijF H L Koppens
Jul 17, 2015·Nature Communications·Zoltán MicsDmitry Turchinovich
Sep 9, 2015·ACS Nano·Andreas BrenneisAlexander W Holleitner
Oct 7, 2015·Scientific Reports·Xinghan CaiMichael S Fuhrer

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