Ultrasensitive monolayer-MoS_(2) heterojunction photodetectors realized via an asymmetric Fabry-Perot cavity  

非对称Fabry-Perot腔增强单层二硫化钼光电探测器

作　　者：Xuexia Chen Jinhao Zang Xun Yang Yuan Zhang Yancheng Chen Yue Zhao Lin Dong Chong-Xin Shan 陈雪霞;臧金浩;杨珣;张元;陈彦成;赵越;董林;单崇新(Henan Key Laboratory of Diamond Optoelectronic Materials and Devices,Key Laboratory of Material Physics,Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China)

机构地区：[1]Henan Key Laboratory of Diamond Optoelectronic Materials and Devices,Key Laboratory of Material Physics,Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China

出　　处：《Science China Materials》2022年第7期1861-1868,共8页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(11674290,U1704138,61804136,U1804155 and 11974317);Henan Science Fund for Distinguished Young Scholars(212300410020);the Key Project of Henan Higher Education(21A140001);Zhengzhou University Physics Discipline Improvement Program and China Postdoctoral Science Foundation(2018M630829 and 2019T120630)。

摘　　要：Two-dimensional(2D)materials have attracted significant attention as a promising candidate for electronic and optoelectronic devices.However,low absorption impairs the performance of few-layer 2D material-based photodetectors(PDs).Herein,we purpose an asymmetric Fabry-Perot cavity consisting of a dielectric layer and metallic film to enhance the interactions between light and monolayer molybdenum disulfide(MoS_(2)).The external quantum efficiency of the monolayer MoS_(2)heterojunction PD is enhanced by more than two orders of magnitude via optimizing the thickness of the dielectric layer.The monolayer-MoS_(2)/nickel oxide heterojunction PD exhibits a large on/off ratio of 2×10^(5),a responsivity of 703 A W^(-1),and an ultrahigh detectivity of 1.31×10^(15)Jones.The detectivity is the best value ever reported for monolayer-MoS_(2)heterojunction PDs.Our results may pave the way for high-performance 2D materialbased PDs.二维材料在柔性光电器件方面具有广泛的应用前景,引起了研究人员的极大兴趣.然而,对于原子层厚度的二维材料来说,低吸收效率限制了其光电探测性能的改善.对此,我们提出了一种利用非对称Fabry-Perot腔增强二维材料吸收效率的方法,该结构由金属和介质层构成.通过优化介质层厚度,可以调控发生多光束干涉相消的波长,使其与二维材料吸收相匹配,从而改善二维材料的吸收效率,并将单层二硫化钼探测器的外量子效率提高了两个数量级.此外,该探测器具有1.31×10^(15)Jones的超高探测率,为已报道的单层二硫化钼异质结探测器中的最高值.本工作为制备高性能二维材料探测器提供了一条有效途径.

关 键 词：monolayer MoS_(2) asymmetric Fabry-Perot cavity HETEROJUNCTION self-powered photodetector DETECTIVITY 

分 类 号：TN15[电子电信—物理电子学] TQ136.12[化学工程—无机化工]