Abstract
Nitrogen-functionalized graphene quantum dots (NGQDs) are attractive building blocks for optoelectronic devices because of their exceptional tunable optical absorption and fluorescence properties. Here, we developed a high-performance flexible NGQD/graphene field-effect transistor (NGQD@GFET) hybrid ultraviolet (UV) photodetector, using dimethylamine-functionalized GQDs (NMe2-GQDs) with a large bandgap of ca. 3.3 eV. The NMe2-GQD@GFET photodetector exhibits high photoresponsivity and detectivity of ca. 1.5 × 104 A W–1 and ca. 5.5 × 1011 Jones, respectively, in the deep-UV region as short as 255 nm without application of a backgate voltage. The feasibility of these flexible UV photodetectors for practical application in flame alarms is also demonstrated.
Highlights
Graphene has important potential for use in highly efficient photodetectors because of its combination of broadband optical absorption and high carrier mobility[1]
We have recently produced a high-performance hybrid photodetector with photoresponsivity of 4 × 104 A W−1 in the deep-UV to NIR wavelength region that uses a 2D/0D graphene hybrid consisting of graphene and nitrogen-functionalized graphene quantum dots (NGQDs) with tunable bandgaps[14, 15]
The carrier transport channel was graphene on top of the 188-μm-thick polyethylene naphthalate (PEN) substrate
Summary
Nitrogen-functionalized graphene quantum dots (NGQDs) are attractive building blocks for optoelectronic devices because of their exceptional tunable optical absorption and fluorescence properties. A hybrid photodetector that exhibits a full-colour optical bandwidth was produced through immobilization of rhodamine-based organic dye molecules with red, green, or blue light absorption profiles onto graphene, whereby photoresponsivity of 103 A W−1 was obtained[5] Such photodetectors’ performance for visible and NIR light detection compares favourably with that of the conventional compound semiconductor-based photodetectors[6,7,8,9]. We have recently produced a high-performance hybrid photodetector with photoresponsivity of 4 × 104 A W−1 in the deep-UV to NIR wavelength region that uses a 2D/0D graphene hybrid consisting of graphene and nitrogen-functionalized graphene quantum dots (NGQDs) with tunable bandgaps[14, 15]. The feasibility of these flexible photodetectors for practical application for flame detection was demonstrated
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