Ambipolar Plasmon-Enhanced Photodetector Built on Germanium Nanodots Array/Graphene Hybrid
Ambipolar Plasmon-Enhanced Photodetector Built on Germanium Nanodots Array/Graphene Hybrid
复制标题
基于锗纳米点阵列/石墨烯混合体的双极等离子体激元增强光电探测器
DOI：
10.1002/admi.202001122
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发表时间：
2020
影响因子：
5.4
通讯作者：
Zengfeng Di
中科院分区：
文献类型：
--
作者：
Min Gao;Ziao Tian;Shiwei Tang;Xiaowen Han;Miao Zhang;Zhongying Xue;Wei Zhu;Yongfeng Mei;Paul K. Chu;Gang Wang;Zengfeng Di
石墨烯具有门控可调的电子特性，有望作为双极型多功能光电探测器的沟道材料。然而，由于零带隙和弱光吸收，在原始石墨烯上制造的光电探测器的光响应度较低。在此，在锗（Ge）纳米点阵列修饰的石墨烯上构建了具有改善的光电流和响应速度的双极多功能光电探测器。光电流图和模拟的电场分布表明，增强的光响应归因于局域表面等离子体共振效应，通过捕获周围的Ge纳米点的光。光电探测器表现出双极光响应，并且由于石墨烯的栅极可调费米能级，通过施加不同的栅极电压可以将光电流从负调整到正。这种双极型光电探测器具有快速响应特性，在成像、传感阵列和多功能光电探测器方面具有很好的应用前景。
Graphene with gate-tunable electronic properties is promising as the channel materials in ambipolar multifunctional photodetectors. However, owing to.the zero bandgap and weak light absorption, photodetectors fabricated on pristine graphene have low photoresponsivity. Herein, an ambipolar ultifunctional.photodetector with improved photocurrent and response speed is constructed on germanium (Ge) nanodots array-decorated graphene. The photocurrent map and simulated electric field distributions reveal that the enhanced photo-response is attributed to the localized surface plasmonic resonance effects by trapping light around the Ge nanodots. The photodetector exhibits ambipolar photo-response and the photocurrents can be tuned from negative to positive by applying different gate voltages due to the gate-tunable Fermi level of graphene. This ambipolar photodetector with fast response has excellent potential in imaging and sensing arrays as well as multifunctional photodetectors.