A Broadband Fluorographene Photodetector
A Broadband Fluorographene Photodetector
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宽带荧光烯光电探测器
DOI：
10.1002/adma.201700463
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发表时间：
2017-06-13
影响因子：
29.4
通讯作者：
Duan, Xiangfeng
中科院分区：
文献类型：
--
作者：
Du, Sichao;Lu, Wei;Duan, Xiangfeng
在从紫外线、可见光到红外线的宽波长范围内工作的高性能光电探测器对于广泛的应用具有重要的科学和技术意义。这里，提出了一种基于石墨烯及其氟功能化衍生物的范德华异质结构的光电探测器。它始终表现出从紫外（255 nm）到中红外（4.3 μm）波长的宽带光响应，与原始石墨烯光电探测器相比，响应度提高了三个数量级。宽带光电探测归因于sp（2）域的空间非均匀集体量子限制和sp（3）域中局域态光激发载流子的捕获的协同效应。可调节的光响应是通过控制 sp(3) 位点的性质以及 sp(3)/sp(2) 域的大小和分数来实现的。此外，还确定了由于 sp(2) 和 sp(3) 纳米域中不同的光激发电荷载流子捕获时间引起的光响应。所提出的方案为实现高性能宽带石墨烯光电探测器铺平了道路。
High-performance photodetectors operating over a broad wavelength range from ultraviolet, visible, to infrared are of scientific and technological importance for a wide range of applications. Here, a photodetector based on van der Waals heterostructures of graphene and its fluorine-functionalized derivative is presented. It consistently shows broadband photoresponse from the ultraviolet (255 nm) to the mid-infrared (4.3 mu m) wavelengths, with three orders of magnitude enhanced responsivity compared to pristine graphene photo-detectors. The broadband photodetection is attributed to the synergistic effects of the spatial nonuniform collective quantum confinement of sp(2) domains, and the trapping of photoexcited charge carriers in the localized states in sp(3) domains. Tunable photoresponse is achieved by controlling the nature of sp(3) sites and the size and fraction of sp(3)/sp(2) domains. In addition, the photoresponse due to the different photoexcited-charge-carrier trapping times in sp(2) and sp(3) nano-domains is determined. The proposed scheme paves the way toward implementing high-performance broadband graphene-based photodetectors.