van der Waals Heterojunction Devices Based on Organohalide Perovskites and Two-Dimensional Materials

被引:184
作者
Cheng, Hung-Chieh [1 ]
Wang, Gongmin [2 ]
Li, Dehui [2 ]
He, Qiyuan [2 ]
Yin, Anxiang [2 ]
Liu, Yuan [1 ]
Wu, Hao [1 ]
Ding, Mengning [1 ]
Huang, Yu [1 ,3 ]
Duan, Xiangfeng [2 ,3 ]
机构
[1] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA
[3] Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USA
关键词
Organohalide perovskites; 2D materials; WSe2; van der Waals heterostructures; optoelectronic devices; LIGHT-EMITTING-DIODES; SOLAR-CELLS; DIFFUSION LENGTHS; HETEROSTRUCTURES; TRANSPORT; GRAPHENE; PHOTODETECTORS; PASSIVATION; CRYSTALS; CONTACT;
D O I
10.1021/acs.nanolett.5b03944
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The recently emerged organohalide perovskites (e.g., CH3NH3PbI3) have drawn intense attention for high efficiency solar cells. However, with a considerable solubility in many solvents, these perovskites are not typically compatible with conventional lithography processes for more complicated device fabrications that are important for both fundamental studies and technological applications. Here, we report the creation of novel heterojunction devices based on perovskites and two-dimensional (2D) crystals by taking advantage of the layered characteristic of lead iodide (PbI2) and vapor-phase intercalation. We show that a graphene/perovskite/graphene vertical stack can deliver a highest photoresponsivity of similar to 950 A/W and photoconductive gain of similar to 2200, and a graphene/WSe2/perovskite/graphene heterojunction can display a high on/off ratio (similar to 10(6)) transistor behavior with distinct gate-tunable diode characteristics and open-circuit voltages. Such unique perovskite-2D heterostructures have significant potential for future optoelectronic research and can enable broad possibilities with compositional tunability of organohalide perovskites and the versatility offered by diverse 2D materials.
引用
收藏
页码:367 / 373
页数:7
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