RhS2

/Tag: RhS2

Stimuli‐Responsive Materials: Self‐Adapting Wettability of ReS2 under a Constant Stimulus (Adv. Mater. 46/2018)

2018-11-13T10:35:59+00:00November 13th, 2018|Categories: Publications|Tags: |

In article number 1804559, Lei Fu and co‐workers enforce a smart self‐adapting wettability (SAQ) of ReS2 under sustained light irradiation, which breaks the stereotype that a single stimulus leads to a monotonic change in properties or structure. This unique SAW provides a brand‐new insight to broaden the applications of responsive materials, which will undoubtedly pave a novel way in further device optimization.

Published in: "Advanced Materials".

Photoresponsive Devices: Ultrahigh Photoresponsive Device Based on ReS2/Graphene Heterostructure (Small 45/2018)

2018-11-11T14:34:21+00:00November 11th, 2018|Categories: Publications|Tags: , , |

In article number 1802593, Changgu Lee and co‐workers develop a photodetector based on a ReS2/graphene heterostructure, which exhibits outstanding photoresponsivity, detectivity, and ultrafast responsivity due to the excellent light absorption property of ReS2 and high carrier mobility of graphene. The interface between ReS2 and graphene facilitates a high photocurrent because of the photogating effect under the applied gate voltage.

Published in: "Small".

Photoresponsive Devices: Ultrahigh Photoresponsive Device Based on ReS2/Graphene Heterostructure (Small 45/2018)

2018-11-10T00:36:38+00:00November 9th, 2018|Categories: Publications|Tags: , , |

In article number 1802593, Changgu Lee and co‐workers develop a photodetector based on a ReS2/graphene heterostructure, which exhibits outstanding photoresponsivity, detectivity, and ultrafast responsivity due to the excellent light absorption property of ReS2 and high carrier mobility of graphene. The interface between ReS2 and graphene facilitates a high photocurrent because of the photogating effect under the applied gate voltage.

Published in: "Small".

Growth of epitaxial ReS2 thin film by pulsed laser deposition. (arXiv:1810.09738v1 [cond-mat.mtrl-sci])

2018-10-24T02:29:32+00:00October 24th, 2018|Categories: Publications|Tags: , |

We present results on growth of large area epitaxial ReS2 thin film both on c plane sapphire substrate and MoS2 template by pulsed laser deposition (PLD). Films tend to grow with (0001) ReS2 perpendicular to (0001) Al2O3 and (0001) ReS2 perpendicular to (0001) MoS2 parallel to (0001) Al2O3 at deposition temperature below 300 deg C. Films are polycrystalline grown at temperature above 300 deg C. The smoothness and quality of the films are significantly improved when grown on MoS2 template compared to sapphire substrate. The results show that PLD is suitable to grow ReS2 epitaxial thin film over large area for practical device application.

Published in: "arXiv Material Science".

Negative Photoconductance in van der Waals Heterostructures-Based Floating Gate Phototransistor. (arXiv:1808.06081v1 [cond-mat.mes-hall])

2018-08-21T04:30:21+00:00August 21st, 2018|Categories: Publications|Tags: , , |

Van der Waals (vdW) heterostructures made of two-dimensional materials have been demonstrated to be versatile architectures for optoelectronic applications due to strong light-matter interactions. However, most of light-controlled phenomena and applications in the vdW heterostructures rely on positive photoconductance (PPC). Negative photoconductance (NPC) has not yet been reported in vdW heterostructures. Here we report the observation of the NPC in ReS2/h-BN/MoS2 vdW heterostructures-based floating gate phototransistor. The fabricated devices exhibit excellent performance of nonvolatile memory without light illumination. More interestingly, we observe a gate-tunable transition between the PPC and the NPC under the light illumination. The observed NPC phenomenon can be attributed to the charge transfer between floating gate and conduction channel. Furthermore, we show that the control of NPC through light intensity is promising in realization of light-tunable multi-bit memory devices. Our results may enable potential applications in multifunctional memories and optoelectronic devices.

Published : "arXiv Mesoscale and Nanoscale Physics".

Defect Engineering for Modulating the Trap States in Two-dimensional Photoconductor. (arXiv:1808.06093v1 [cond-mat.mtrl-sci])

2018-08-21T02:29:26+00:00August 21st, 2018|Categories: Publications|Tags: |

Defect induced trap states are essential in determining the performance of semiconductor photodetectors. The de-trap time of carriers from a deep trap could be prolonged by several orders of magnitude as compared to shallow trap, resulting in additional decay/response time of the device. Here, we demonstrate that the trap states in two-dimensional ReS2 could be efficiently modulated by defect engineering through molecule decoration. The deep traps that greatly prolong the response time could be mostly filled by Protoporphyrin (H2PP) molecules. At the same time, carrier recombination and shallow traps would in-turn play dominant roles in determining the decay time of the device, which can be several orders of magnitude faster than the as-prepared device. Moreover, the specific detectivity of the device is enhanced (as high as ~1.89 x 10^13 Jones) due to the significant reduction of dark current through charge transfer between ReS2 and molecules. Defect engineering of trap states therefore provides a solution to achieve photodetectors with both high responsivity and fast response.

Published in: "arXiv Material Science".

Pressure-induced structural and electronic transitions, metallization, and enhanced visible-light responsiveness in layered rhenium disulphide

2018-06-07T16:33:21+00:00June 7th, 2018|Categories: Publications|Tags: |

Author(s): Pei Wang, Yonggang Wang, Jingyu Qu, Qiang Zhu, Wenge Yang, Jinlong Zhu, Liping Wang, Weiwei Zhang, Duanwei He, and Yusheng ZhaoTriclinic rhenium disulphide (ReS2) is a promising candidate for postsilicon electronics because of its unique optic-electronic properties. The electrical and optical properties of ReS2 under high pressure, however, remain unclear. Here we present a joint experimental and theoretical study on the st…[Phys. Rev. B 97, 235202] Published Thu Jun 07, 2018

Published in: "Physical Review B".

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