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    Photocurrent generation in lateral graphene p-n junction created by electron-beam irradiation

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    srep12014.pdf
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    Type
    Article
    Authors
    Yu, Xuechao
    Shen, Youde
    Liu, Tao
    Wu, Tao cc
    Jie Wang, Qi
    KAUST Department
    Materials Science and Engineering Program
    Date
    2015-07-08
    Online Publication Date
    2015-07-08
    Print Publication Date
    2015-12
    Permanent link to this record
    http://hdl.handle.net/10754/560371
    
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    Abstract
    Graphene has been considered as an attractive material for optoelectronic applications such as photodetectors owing to its extraordinary properties, e.g. broadband absorption and ultrahigh mobility. However, challenges still remain in fundamental and practical aspects of the conventional graphene photodetectors which normally rely on the photoconductive mode of operation which has the drawback of e.g. high dark current. Here, we demonstrated the photovoltaic mode operation in graphene p-n junctions fabricated by a simple but effective electron irradiation method that induces n-type doping in intrinsic p-type graphene. The physical mechanism of the junction formation is owing to the substrate gating effect caused by electron irradiation. Photoresponse was obtained for this type of photodetector because the photoexcited electron-hole pairs can be separated in the graphene p-n junction by the built-in potential. The fabricated graphene p-n junction photodetectors exhibit a high detectivity up to ~3 × 1010 Jones (cm Hz1/2 W−1) at room temperature, which is on a par with that of the traditional III–V photodetectors. The demonstrated novel and simple scheme for obtaining graphene p-n junctions can be used for other optoelectronic devices such as solar cells and be applied to other two dimensional materials based devices.
    Citation
    Photocurrent generation in lateral graphene p-n junction created by electron-beam irradiation 2015, 5:12014 Scientific Reports
    Publisher
    Springer Nature
    Journal
    Scientific Reports
    DOI
    10.1038/srep12014
    PubMed ID
    26152225
    Additional Links
    http://www.nature.com/doifinder/10.1038/srep12014
    ae974a485f413a2113503eed53cd6c53
    10.1038/srep12014
    Scopus Count
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    Articles; Material Science and Engineering Program

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