Long wavelength optical response of graphene-MoS2 heterojunction

Kwak, Joon Young; Hwang, Jeonghyun; Calderon, Brian; Alsalman, Hussain; Spencer, Michael G.

doi:10.1063/1.4943169

Cited by 11 publications

(3 citation statements)

References 47 publications

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“…The absence of high quality p–n junctions also limits the performance of the MoS 2 based devices. Although photodetectors based on mono/multilayer MoS 2 heterostructure have shown excellent device characteristics in terms of high sensitivity (up to 7 A/W) and wide band response 26 27 28 29 their applicability still suffers due to complex fabrication process.…”

mentioning

confidence: 99%

High-Speed Scalable Silicon-MoS2 P-N Heterojunction Photodetectors

Dhyani

Das

2017

Sci Rep

137

103

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Two-dimensional molybdenum disulfide (MoS2) is a promising material for ultrasensitive photodetector owing to its favourable band gap and high absorption coefficient. However, their commercial applications are limited by the lack of high quality p-n junction and large wafer scale fabrication process. A high speed Si/MoS2 p-n heterojunction photodetector with simple and CMOS compatible approach has been reported here. The large area MoS2 thin film on silicon platform has been synthesized by sulfurization of RF-sputtered MoO3 films. The fabricated molecular layers of MoS2 on silicon offers high responsivity up to 8.75 A/W (at 580 nm and 3 V bias) with ultra-fast response of 10 μsec (rise time). Transient measurements of Si/MoS2 heterojunction under the modulated light reveal that the devices can function up to 50 kHz. The Si/MoS2 heterojunction is found to be sensitive to broadband wavelengths ranging from visible to near-infrared light with maximum detectivity up to ≈1.4 × 1012 Jones (2 V bias). Reproducible low dark current and high responsivity from over 20 devices in the same wafer has been measured. Additionally, the MoS2/Si photodetectors exhibit excellent stability in ambient atmosphere.

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mentioning

confidence: 99%

High-Speed Scalable Silicon-MoS2 P-N Heterojunction Photodetectors

Dhyani

Das

2017

Sci Rep

137

103

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“…As shown in Figure 1f, the main C 1s peak at 284.5 eV corresponds to the sp 2 hybridized carbon atoms (C−C bond). 30 In addition, a small shoulder peak at 285.9 eV, corresponding to the C−O bonds, 31 is noted to appear due to the structural disorder around the graphene edges or slight oxidation of the prepared GFs. 32 Overall, the findings confirm the successful synthesis of 3D-GFs.…”

Section: Resultsmentioning

confidence: 99%

Wireless Electrical Signals Induce Functional Neuronal Differentiation of BMSCs on 3D Graphene Framework Driven by Magnetic Field

et al. 2023

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Bone marrow mesenchymal stem cells (BMSCs) are suggested as candidates for neurodegeneration therapy by autologous stem cells to overcome the lack of neural stem cells in adults. However, the differentiation of BMSCs into functional neurons is a major challenge for neurotherapy. Herein, a methodology has been proposed to induce functional neuronal differentiation of BMSCs on a conductive three-dimensional graphene framework (GFs) combined with a rotating magnetic field. A wireless electrical signal of about 10 μA can be generated on the surface of GFs by cutting the magnetic field lines based on the well-known electromagnetic induction effect, which has been proven to be suitable for inducing neuronal differentiation of BMSCs. The enhanced expressions of the specific genes/proteins and apparent Ca2+ intracellular flow indicate that BMSCs cultured on GFs with 15 min/day rotating magnetic field stimulation for 15 days can differentiate functional neurons without any neural inducing factor. The animal experiments confirm the neural differentiation of BMSCs on GFs after transplantation in vivo, accompanied by stimulation of an external rotating magnetic field. This study overcomes the lack of autologous neural stem cells for adult neurodegeneration patients and provides a facile and safe strategy to induce the neural differentiation of BMSCs, which has potential for clinical applications of neural tissue engineering.

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“…For example, the phosphorene/graphene heterostructure displays tuning of the contact from n-type Schottky to p-type Schottky and then ohmic by simply tailoring the relative position of the graphene's Fermi level within the phosphorene's band gap [2]. Additional examples of such heterostructures include semiconducting transition metal dichalcogenides and graphene, which are proposed for largescale 2D electronics [3][4][5][6][7][8][9]. Note that synthesis and characterization of such heterostructures involving graphene is of particular interest due to graphene being a material with a high electron mobility [10].…”

Section: Introductionmentioning

confidence: 99%

Stability and electronic properties of hybrid SnO bilayers: SnO/graphene and SnO/BN

et al. 2017

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Van der Waals structures based on two-dimensional materials have been considered as promising structures for novel nanoscale electronic devices. Two-dimensional SnO films which display intrinsic p-type semiconducting properties were fabricated recently. In this paper, we consider vertically stacked heterostructures consisting of a SnO monolayer with graphene or a BN monolayer to investigate their stability, electronic and transport properties using density functional theory. The calculated results find that the properties of the constituent monolayers are retained in these SnO-based heterostructures, and a p-type Schottky barrier is formed in the SnO/graphene heterostructure. Additionally, the Schottky barrier can be effectively controlled with an external electric field, which is useful characteristic for the van der Waals heterostructure-based electronic devices. In the SnO/BN heterostructure, the electronic properties of SnO are least affected by the insulating monolayer suggesting that the BN monolayer would be an ideal substrate for SnO-based nanoscale devices.

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Long wavelength optical response of graphene-MoS2 heterojunction

Cited by 11 publications

References 47 publications

High-Speed Scalable Silicon-MoS2 P-N Heterojunction Photodetectors

High-Speed Scalable Silicon-MoS2 P-N Heterojunction Photodetectors

Wireless Electrical Signals Induce Functional Neuronal Differentiation of BMSCs on 3D Graphene Framework Driven by Magnetic Field

Stability and electronic properties of hybrid SnO bilayers: SnO/graphene and SnO/BN

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