▎ 摘　　要

We demonstrate carbon quantum dots (C QDs)-coupled graphene/silicon (Si) Schottky- junction photodetectors with similar to 290 mA W-1 responsivity. The C QDs were fabricated by carbon evaporation, which facilitated easy control of the distribution and pattern of the QDs can be easily controlled by a mask. The photoresponsivity was enhanced by 4.3% when the C QDs were coupled with the graphene/Si Schottky junction photodetectors. The wideband spectrum response flatly covers the visible spectrum. The response time is less than 2 mu s, which is better than most detectors based on graphene-Schottky or QDs structures. This work demonstrates a feasible approach for improving the performance of graphene-based photodetectors, suggesting an alternative architecture for QDs graphene photodetectors.