Metamaterial grating-integrated graphene photodetector with broadband high responsivity
Metamaterial grating-integrated graphene photodetector with broadband high responsivity
复制标题
宽带高响应度超材料光栅集成石墨烯光电探测器
DOI：
10.1016/j.apsusc.2018.12.194
复制
发表时间：
2019-04-15
影响因子：
6.7
通讯作者：
Zhang, Yongzhe
中科院分区：
文献类型：
--
作者：
Li, Jingfeng;Zhao, Chen;Zhang, Yongzhe
石墨烯在光电场中具有一些出色的特性，尤其是超快速响应和宽光谱吸收，这引起了石墨烯光电探测器的强烈吸引力。但是，纯石墨烯设备的光呼率低于10 mA W-1。它将限制石墨烯光电探测器的应用。在这里，我们设计了具有宽带高吸收光谱的超物质结构。通过将其集成到石墨烯光电探测器中，可以获取纯石墨烯光电探测器在宽带范围内的高光呼率。光电探测器的光呼率可以实现近200 mA W（-1），这是两个阶级比纯单层石墨烯光电探测器高两个阶。此外，光电探测器还保持宽带光响应。热载体可以通过多种共振的耦合来产生，并有效地运输到石墨烯，具有超薄金属膜的优势。基于这项工作，可以在某些相关领域开发石墨烯光电探测器的更多潜在应用。
Graphene has some outstanding properties in the photoelectric field, especially ultra fast response and broad spectrum absorption, which have led to strong attraction on graphene photodetector. However, the photoresponsivity of pure graphene device is below 10 mA W-1. It would limit the application of graphene photodetector. Here, we design a metamaterial structure with a broadband high absorption spectrum. And by integrating it into the graphene photodetector, the high photoresponsivity of a pure graphene photodetector in a broadband range could be acquired. The photoresponsivity of photodetector can achieve nearly 200 mA W(-1)which is two orders higher than the one of pure monolayer graphene photodetector. Besides, the photodetector also keeps the broadband photoresponse. The hot carriers can be generated by coupling of multiple resonances and effectively transported to graphene with the advantage of ultrathin metal film. Based on this work, more potential applications of graphene photodetector could be developed in some related fields.