The intrinsically poor optical absorption and short carrier lifetime of graphene have restricted its practical application in photodetectors. Carbon nanodots (CNDs) have received much attention due to their fascinating optical properties, environmentally friendly nature, small size, and superiority of a large optical absorptivity. Thus, in this article, a hybrid photodetector based on CNDs and graphene has been proposed for the solar-blind ultraviolet (UV) photodetection, in which CNDs were integrated with graphene to form a hybrid structure which was capable of detecting UV light with 254 nm. Here, this article also demonstrated that a high photoresponsivity of ~433.33 A/W and a detectivity of $\sim 1.08\times 10^{{12}}$ Jones can be obtained in the hybrid photodetector. UV illumination causes photogenerated electrons and holes in CNDs. Holes transfer to graphene and then recirculate many times, which originates from the high carrier mobility of graphene and the prolonged lifetime of excited electrons that remain trapped in CNDs. Our result demonstrates that the integration of graphene and CNDs shows better optical absorption and wavelength selectivity. Together with the mechanism, it paves a step for practical applications of quantum dots sensitized graphene-based photodetectors.

中文翻译：

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基于碳纳米点/石墨烯杂化体的高响应性日盲紫外光电探测器

石墨烯固有的较差的光吸收和较短的载流子寿命限制了其在光电探测器中的实际应用。碳纳米点（CND）由于其引人入胜的光学性能，环保特性，小尺寸以及大光吸收性的优越性而备受关注。因此，在本文中，提出了一种基于CND和石墨烯的混合光电探测器用于太阳盲紫外（UV）光探测，其中CND与石墨烯集成在一起，形成了一种能够检测254 nm紫外光的混合结构。 。在此，本文还证明了〜433.33 A / W的高光响应性和 $ \ sim 1.08 \ times 10 ^ {{12}} $ 琼斯可以在混合光电探测器中获得。紫外线照射会在CND中产生光生电子和空穴。空穴转移到石墨烯，然后循环很多次，这是由于石墨烯的高载流子迁移率和保留在CND中的激发电子的寿命延长所致。我们的结果表明，石墨烯和CND的集成显示出更好的光吸收和波长选择性。连同该机制，它为量子点敏化的基于石墨烯的光电检测器的实际应用迈出了一步。