High Detectivity and Transparent Few-Layer MoS(2) /Glassy-Graphene Heterostructure Photodetectors.

Layered van der Waals heterostructures have attracted considerable attention recently, due to their unique properties both inherited from individual two-dimensional (2D) components and imparted from their interactions. Here, a novel few-layer MoS2 /glassy-graphene heterostructure, synthesized by a layer-by-layer transfer technique, and its application as transparent photodetectors are reported for the first time. Instead of a traditional Schottky junction, coherent ohmic contact is formed at the interface between the MoS2 and the glassy-graphene nanosheets. The device exhibits pronounced wavelength selectivity as illuminated by monochromatic lights. A responsivity of 12.3 mA W-1 and detectivity of 1.8 × 1010 Jones are obtained from the photodetector under 532 nm light illumination. Density functional theory calculations reveal the impact of specific carbon atomic arrangement in the glassy-graphene on the electronic band structure. It is demonstrated that the band alignment of the layered heterostructures can be manipulated by lattice engineering of 2D nanosheets to enhance optoelectronic performance.

Xu H ，Han X ，Dai X ，Liu W ，Wu J ，Zhu J ，Kim D ，Zou G ，Sablon KA ，Sergeev A ，Guo Z ，Liu H ... -  《-》

Printable Transfer-Free and Wafer-Size MoS(2)/Graphene van der Waals Heterostructures for High-Performance Photodetection.

Liu Q ，Cook B ，Gong M ，Gong Y ，Ewing D ，Casper M ，Stramel A ，Wu J ... -  《-》

Air-Stable Violet Phosphorus/MoS(2) van der Waals Heterostructure for High-Responsivity and Gate-Tunable Photodetection.

Violet phosphorus (VP), a newly emerging elemental 2D semiconductor, with attractive properties such as tunable bandgap, high carrier mobility, and unusual structural anisotropy, offers significant opportunities for designing high-performance electronic and optoelectronic devices. However, the study on fundamental property and device application of 2D VP is seriously hindered by its inherent instability in ambient air. Here, a VP/MoS2 van der Waals heterostructure is constructed by vertically staking few-layer VP and MoS2 , aiming to utilize the synergistic effect of the two materials to achieve a high-performance 2D photodetector. The strong optical absorption of VP combining with the type-II band alignment of VP/MoS2 heterostructure make VP play a prominent photogating effect. As a result, the VP/MoS2 heterostructure photodetector achieves an excellent photoresponse performances with ultrahigh responsivity of 3.82 × 105  A W-1 , high specific detectivity of 9.17 × 1013 Jones, large external quantum efficiency of 8.91 × 107 %, and gate tunability, which are much superior to that of individual MoS2 device or VP device. Moreover, the VP/MoS2 heterostructure photodetector indicates superior air stability due to the effective protection of VP by MoS2 encapsulation. This work sheds light on the future study of the fundamental property and optoelectronic device application of VP.

Zhang Y ，Zhu T ，Zhang N ，Li Y ，Li X ，Yan M ，Tang Y ，Zhang J ，Jiang M ，Xu H ... -  《-》

Photogating Effect of Atomically Thin Graphene/MoS(2)/MoTe(2) van der Waals Heterostructures.

Park DH ，Lee HC 《Micromachines》

Band Alignment and Minigaps in Monolayer MoS2-Graphene van der Waals Heterostructures.

Pierucci D ，Henck H ，Avila J ，Balan A ，Naylor CH ，Patriarche G ，Dappe YJ ，Silly MG ，Sirotti F ，Johnson AT ，Asensio MC ，Ouerghi A ... -  《-》