Layer dependence and gas molecule absorption property in MoS2 Schottky diode with asymmetric metal contacts

Yoon, Hyong Seo; Joe, Hang-Eun; Kim, Sun Jun; Lee, Hee Sung; Im, Seongil; Min, Byung Kwon; Jun, Seong Chan

doi:10.1038/srep10440

Cited by 49 publications

(35 citation statements)

References 31 publications

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“…Lastly, in the reverse bias region, I increases as the number of MoS 2 layers increases. In general, increasing the number of MoS 2 layers can lead to a reduction of the interfacial barrier height at the N L -MoS 2 /Au junction due to bandgap reduction derived from the strong interlayer electronic coupling between the sulfur atoms and the quantum confinement effect 24,25 . Furthermore, because charge transport at the Au/N L -MoS 2 /Au junction can be explained by the Schottky emission mechanism ( Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Tunable rectification in a molecular heterojunction with two-dimensional semiconductors

et al. 2020

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Until now, a specifically designed functional molecular species has been recognized as an absolute necessity for realizing the diode's behavior in molecular electronic junctions. Here, we suggest a facile approach for the implementation of a tailored diode in a molecular junction based on non-functionalized alkyl and conjugated molecular monolayers. A twodimensional semiconductor (MoS 2 and WSe 2 ) is used as a rectifying designer at the alkyl or conjugated molecule/Au interface. From the adjustment of band alignment at molecules/ two-dimensional semiconductor interface that can activate different transport pathways depending on the voltage polarity, the rectifying characteristics can be implemented and controlled. The rectification ratio could be widely tuned from 1.24 to 1.83 × 10 4 by changing the molecular species and type and the number of layers of the two-dimensional semiconductors in the heterostructure molecular junction. Our work sets a design rule for implementing tailored-diode function in a molecular heterojunction structure with nonfunctionalized molecular systems.

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Section: Resultsmentioning

confidence: 99%

Tunable rectification in a molecular heterojunction with two-dimensional semiconductors

et al. 2020

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“…A bias voltage was applied to the Pt probe and swept from −5 to 5 V. The I - V graph exhibits asymmetric and nonlinear behavior. The nonlinear curve implies that Schottky contacts are formed between the MoS 2 layer and the electrode, presumably due to the large band gap of MoS 2 20 . Since the work function of the Pt probe is larger than that of the Au/Ti electrode, a negative bias on the Pt probe would worsen the Schottky barrier between the MoS 2 film and the Au/Ti electrode, resulting in a low current level.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale enhancement of photoconductivity by localized charge traps in the grain structures of monolayer MoS2

Yang

Kim

Lee

et al. 2018

Sci Rep

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We report a method for mapping the nanoscale anomalous enhancement of photoconductivity by localized charge traps in the grain structures of a molybdenum disulfide (MoS2) monolayer. In this work, a monolayer MoS2 film was laterally scanned by a nanoscale conducting probe that was used to make direct contact with the MoS2 surface. Electrical currents and noise maps were measured through the probe. By analyzing the data, we obtained maps for the sheet resistance and charge trap density for the MoS2 grain structures. The maps clearly show grains for which sheet resistance and charge trap density were lower than those of the grain boundaries. Interestingly, we found an unusual inverse proportionality between the sheet resistance and charge trap density in the grains, which originated from the unique role of sulfur vacancies acting as both charge hopping sites and traps in monolayer MoS2. In addition, under light illumination, the larger the trap density of a region was, the larger the photocurrent of the region was, indicating anomalous enhancement of the photocurrent by traps. Since our method provides valuable insights to understand the nanoscale effects of traps on photoconductive charge transport, it can be a powerful tool for noise studies and the practical application of two-dimensional materials.

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“…The effect of noble metals on enhancing photocatalytic activity can be understood considering the following factors; (a) Noble metals of high work functions in contact with n-type MoS 2 form low-barrier Schottky junctions which facilitate the separation of e − h + , promoting their migration and participation in ROS generation 42 – 45 . We identify that our n-type MoS 2 with vertically-aligned layers (Fig.…”

Section: Resultsmentioning

confidence: 99%

Noble metal-coated MoS2 nanofilms with vertically-aligned 2D layers for visible light-driven photocatalytic degradation of emerging water contaminants

Islam

Church

Cui

et al. 2017

Sci Rep

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Two-dimensional molybdenum disulfide (2D MoS2) presents extraordinary optical, electrical, and chemical properties which are highly tunable by engineering the orientation of constituent 2D layers. 2D MoS2 films with vertically-aligned layers exhibit numerous 2D edge sites which are predicted to offer superior chemical reactivity owing to their enriched dangling bonds. This enhanced chemical reactivity coupled with their tunable band gap energy can render the vertical 2D MoS2 unique opportunities for environmental applications that go beyond the conventional applications of horizontal 2D MoS2 in electronics/opto-electronics. Herein, we report that MoS2 films with vertically-aligned 2D layers exhibit excellent visible light responsive photocatalytic activities for efficiently degrading organic compounds in contaminated water such as harmful algal blooms. We demonstrate the visible light-driven rapid degradation of microcystin-LR, one of the most toxic compounds produced by the algal blooms, and reveal that the degradation efficiency can be significantly improved by incorporating noble metals. This study suggests a high promise of these emerging 2D materials for water treatment, significantly broadening their versatility for a wide range of energy and environmental applications.

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Layer dependence and gas molecule absorption property in MoS2 Schottky diode with asymmetric metal contacts

Cited by 49 publications

References 31 publications

Tunable rectification in a molecular heterojunction with two-dimensional semiconductors

Tunable rectification in a molecular heterojunction with two-dimensional semiconductors

Nanoscale enhancement of photoconductivity by localized charge traps in the grain structures of monolayer MoS2

Noble metal-coated MoS2 nanofilms with vertically-aligned 2D layers for visible light-driven photocatalytic degradation of emerging water contaminants

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