Van der Waals Coupled Organic Molecules with Monolayer MoS2 for Fast Response Photodetectors with Gate-Tunable Responsivity

被引:221
作者
Huang, Yu [1 ]
Zhuge, Fuwei [1 ]
Hou, Junxian [2 ]
Lv, Liang [1 ]
Luo, Peng [1 ]
Zhou, Nan [1 ]
Gan, Lin [1 ]
Zhai, Tianyou [1 ,3 ,4 ]
机构
[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China
[2] Hebei Univ Engn, Coll Mat Sci & Engn, Dept Composite Mat & Engn, Handan 056038, Peoples R China
[3] Tianjin Univ, Dept Chem, Tianjin Key Lab Mol Optoelect Sci, Tianjin 300072, Peoples R China
[4] Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
基金
中国国家自然科学基金;
关键词
transition metal dichalcogenides; van der Waals junction; organic molecules; charge transfer interaction; photodetection; response dynamics; SINGLE-LAYER MOS2; PHOTOLUMINESCENCE; TRANSISTORS; MECHANISMS; GAIN;
D O I
10.1021/acsnano.8b02380
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
As a direct-band-gap transition metal dichalcogenide (TMD), atomic thin MoS2 has attracted extensive attention in photodetection, whereas the hitherto unsolved persistent photoconductance (PPC) from the ungoverned charge trapping in devices has severely hindered their employment. Herein, we demonstrate the realization of ultrafast photoresponse dynamics in monolayer MoS2 by exploiting a charge transfer interface based on surface assembled zinc phthalocyanine (ZnPc) molecules. The formed MoS2/ZnPc van der Waals interface is found to favorably suppress the PPC phenomenon in MoS2 by instantly separating photogenerated holes toward the ZnPc molecules, away from the traps in MoS2 and the dielectric interface. The derived MoS2 detector then exhibits significantly improved photoresponse speed by more than 3 orders (from over 20 s to less than 8 ms for the decay) and a high responsivity of 430 A/W after Al2O3 passivation. It is also demonstrated that the device could be further tailored to be 2-10-fold more sensitive without severely sacrificing the ultrafast response dynamics using gate modulation. The strategy presented here based on surface-assembled organic molecules may thus pave the way for realizing high-performance TMD-based photodetection with ultrafast speed and high sensitivity.
引用
收藏
页码:4062 / 4073
页数:12
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