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Competing Mechanisms for Photocurrent Induced at the Monolayer-Multilayer Graphene Junction
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
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2018 (English)In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 14, no 24, article id 1800691Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 14, no 24, article id 1800691
Keywords [en]
Dirac points, graphene junctions, monolayers, multilayers, photocurrent mechanisms
National Category
Physical Chemistry Condensed Matter Physics Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-358687DOI: 10.1002/smll.201800691ISI: 000436238500010PubMedID: 29766647OAI: oai:DiVA.org:uu-358687DiVA, id: diva2:1245716
Funder
Swedish Research Council, 621-2014-5591Available from: 2018-09-05 Created: 2018-09-05 Last updated: 2018-10-12Bibliographically approved

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