Interlayer Transition and Infrared Photodetection in Atomically Thin Type-II MoTe2/MoS2 van der Waals Heterostructures

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• 作者：Kenan Zhang ; Tianning Zhang ; Guanghui Cheng ; Tianxin Li ; Shuxia Wang ; Wei Wei ; Xiaohao Zhou ; Weiwei Yu ; Yan Sun ; Peng Wang ; Dong Zhang ; Changgan Zeng ; Xingjun Wang ; Weida Hu ; Hong Jin Fan ; Guozhen Shen ; Xin Chen ; Xiangfeng Duan ; Kai Chang ; Ning Dai
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：March 22, 2016
• 年：2016
• 卷：10
• 期：3
• 页码：3852-3858
• 全文大小：447K
• ISSN：1936-086X

文摘

We demonstrate the type-II staggered band alignment in MoTe₂/MoS₂ van der Waals (vdW) heterostructures and an interlayer optical transition at ∼1.55 μm. The photoinduced charge separation between the MoTe₂/MoS₂ vdW heterostructure is verified by Kelvin probe force microscopy (KPFM) under illumination, density function theory (DFT) simulations and photoluminescence (PL) spectroscopy. Photoelectrical measurements of MoTe₂/MoS₂ vdW heterostructures show a distinct photocurrent response in the infrared regime (1550 nm). The creation of type-II vdW heterostructures with strong interlayer coupling could improve our fundamental understanding of the essential physics behind vdW heterostructures and help the design of next-generation infrared optoelectronics.