异质结
材料科学
光电子学
纳米技术
范德瓦尔斯力
凝聚态物理
物理
化学
分子
有机化学
作者
Horng Long Cheng,Gongming Wang,Dehui Li,Qiyuan He,Anxiang Yin,Yuan Liu,Hao Wu,Mengning Ding,Yu Huang,Xiangfeng Duan
出处
期刊:Nano Letters
[American Chemical Society]
日期:2015-12-22
卷期号:16 (1): 367-373
被引量:187
标识
DOI:10.1021/acs.nanolett.5b03944
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 ∼950 A/W and photoconductive gain of ∼2200, and a graphene/WSe2/perovskite/graphene heterojunction can display a high on/off ratio (∼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.
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