title: All carbon-based photodetectors: an eminent integration of graphite quantum dots and two dimensional graphene.
abstract: Photodetectors with ultrahigh sensitivity based on the composite made with all carbon-based materials consisting of graphite quantum dots (QDs), and two dimensional graphene crystal have been demonstrated. Under light illumination, remarkably, a photocurrent responsivity up to 4 × 10(7) AW(-1) can be obtained. The underlying mechanism is attributed to the spatial separation of photogenerated electrons and holes due to the charge transfer caused by the appropriate band alignment across the interface between graphite QDs and graphene. Besides, the large absorptivity of graphite QDs and the excellent conductivity of the graphene sheet also play significant roles. Our result therefore demonstrates an outstanding illustration for the integration of the distinct properties of nanostructured carbon materials with different dimensionalities to achieve highly efficient devices. Together with the associated mechanism, it paves a valuable step for the further development of all carbon-based, cheap, and non-toxic optoelectronics devices with excellent performance.
authors.affiliation: Department of Physics, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Shih-Hao
authors.initials: SH
authors.lastname: Cheng
authors.forename: Tong-Min
authors.initials: TM
authors.lastname: Weng
authors.forename: Meng-Lin
authors.initials: ML
authors.lastname: Lu
authors.forename: Wei-Chun
authors.initials: WC
authors.lastname: Tan
authors.forename: Ju-Ying
authors.initials: JY
authors.lastname: Chen
authors.forename: Yang-Fang
authors.initials: YF
authors.lastname: Chen
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