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    Photodetection in p–n junctions formed by electrolyte-gated transistors of two-dimensional crystals

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    Type
    Article
    Authors
    Kozawa, Daichi
    Pu, Jiang
    Shimizu, Ryo
    Kimura, Shota
    Chiu, Ming-Hui cc
    Matsuki, Keiichiro
    Wada, Yoshifumi
    Sakanoue, Tomo
    Iwasa, Yoshihiro
    Li, Lain-Jong cc
    Takenobu, Taishi
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-11-16
    Online Publication Date
    2016-11-16
    Print Publication Date
    2016-11-14
    Permanent link to this record
    http://hdl.handle.net/10754/621925
    
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    Abstract
    Transition metal dichalcogenide monolayers have attracted much attention due to their strong light absorption and excellent electronic properties. These advantages make this type of two-dimensional crystal a promising one for optoelectronic device applications. In the case of photoelectric conversion devices such as photodetectors and photovoltaic cells, p–n junctions are one of the most important devices. Here, we demonstrate photodetection with WSe2 monolayer films. We prepare the electrolyte-gated ambipolar transistors and electrostatic p–n junctions are formed by the electrolyte-gating technique at 270 K. These p-n junctions are cooled down to fix the ion motion (and p-n junctions) and we observed the reasonable photocurrent spectra without the external bias, indicating the formation of p-n junctions. Very interestingly, two-terminal devices exhibit higher photoresponsivity than that of three-terminal ones, suggesting the formation of highly balanced anion and cation layers. The maximum photoresponsivity reaches 5 mA/W in resonance with the first excitonic peak. Our technique provides important evidence for optoelectronics in atomically thin crystals.
    Citation
    Kozawa D, Pu J, Shimizu R, Kimura S, Chiu M-H, et al. (2016) Photodetection in p–n junctions formed by electrolyte-gated transistors of two-dimensional crystals. Applied Physics Letters 109: 201107. Available: http://dx.doi.org/10.1063/1.4967173.
    Sponsors
    D.K. acknowledges the support of the Grant-in-Aid for Encouragement of Young Scientists (B) (JSPS KAKENHI Grant No. JP 16K17485) from Japan Society for the Promotion of Science (JSPS). Y.W., J.P., and K.M. acknowledge the Leading Graduate Program in Science and Engineering, Waseda University, from JSPS. D.K. and J.P. were supported by the Grant-in-Aid for JSPS Fellows (JSPS KAKENHI Grant Nos. JP 15J07423 and JP 14J07485). T.S. is grateful to the Grant-in-Aid for Encouragement of Young Scientists (A) (JSPS KAKENHI Grant No. JP 26706012) from JSPS. T.T. was partially supported by the Funding Program for the Next Generation of World-Leading Researchers from JSPS, and Grants-in-Aid from MEXT (JSPS KAKENHI Grant Nos. JP 16K13618, JP 26102012 “π-System Figuration,” and JP 25000003 “Specially Promoted Research”).
    Publisher
    AIP Publishing
    Journal
    Applied Physics Letters
    DOI
    10.1063/1.4967173
    arXiv
    1611.01589
    Additional Links
    http://scitation.aip.org/content/aip/journal/apl/109/20/10.1063/1.4967173
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4967173
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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