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A High-On/Off-Ratio Floating-Gate Memristor Array on a Flexible Substrate via CVD-Grown Large-Area 2D Layer Stacking

2017-09-26T14:32:25+00:00 September 26th, 2017|Categories: Publications|Tags: , |

By Quoc An Vu, Hyun Kim, Van Luan Nguyen, Ui Yeon Won, Subash Adhikari, Kunnyun Kim, Young Hee Lee, Woo Jong Yu

Abstract Memristors such as phase-change memory and resistive memory have been proposed to emulate the synaptic activities in neuromorphic systems. However, the low reliability of these types of memories is their biggest challenge for commercialization. Here, a highly reliable memristor array using floating-gate memory operated by two terminals (source and drain) using van der Waals layered materials is demonstrated. Centimeter-scale samples (1.5 cm × 1.5 cm) of MoS2 as a channel and graphene as a trap layer grown by chemical vapor deposition (CVD) are used for array fabrication with Al2O3 as the tunneling barrier. With regard to the memory characteristics, 93% of the devices exhibit an on/off ratio of over 103 with an average ratio of 104. The high on/off ratio and reliable endurance in the devices allow stable 6-level memory applications. The devices also exhibit excellent memory durability over 8000 cycles with a negligible shift in the threshold voltage and on-current, which is a significant improvement over other types of memristors. In addition, the devices can be strained up to 1% by fabricating on a flexible substrate. This demonstration opens a practical route for next-generation electronics with CVD-grown van der Waals layered materials. A highly reliable memristor array using floating-gate memory operated by two terminals (source and drain) using van der Waals layered materials is demonstrated. Centimeter-scale samples (1.5 cm × 1.5 cm) of MoS2 as a channel and graphene as a trap layer grown by chemical vapor deposition are used for the array fabrication with Al2O3 as the

Published in: "Advanced Materials".

Robust quasi-ohmic contact against angle rotation in noble transition-metal-dichalcogenide/graphene heterobilayers

2017-09-26T14:28:54+00:00 September 26th, 2017|Categories: Publications|Tags: , |

RSC Adv., 2017, 7,45896-45901DOI: 10.1039/C7RA09945B, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.Siyao Hou, Lihong Han, Liyuan Wu, Ruge Quhe, Pengfei LuSmall Schottky barriers appear in PtS2/graphene and PdS2/graphene against interlayer rotation angles.The content of

Published in: "RSC Advances".

Grafting polycarbonate onto graphene nanosheets: synthesis and characterization of high performance polycarbonate-graphene nanocomposites for ESD/EMI applications

2017-09-26T14:28:53+00:00 September 26th, 2017|Categories: Publications|Tags: |

RSC Adv., 2017, 7,45902-45910DOI: 10.1039/C7RA07537E, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.Sang-Hwa Yoon, Hee-Tae JungHigh performance polycarbonate-graphene nanocomposites were synthesized by grafting polycarbonate onto graphene nanosheets with outstanding mechanical and electrical properties.The content of

Published in: "RSC Advances".

Boron nitride nanotube as a heat sinking and stress-relaxation layer for high performance light-emitting diode

2017-09-26T14:24:18+00:00 September 26th, 2017|Categories: Publications|Tags: |

Nanoscale, 2017, Accepted ManuscriptDOI: 10.1039/C7NR04508E, PaperTae Hoon Seo, Gun Hee Lee, Ah Hyun ParK, Hyunjin Cho, Jun Hee Kim, Chandramohan Samygounder, Seong-Ran Jeon, Se Gyu Jang, Myung Jong Kim, E SuhHigh-density threading dislocations, presence of biaxial compressive strain, and heat generation are major

Published in: "RSC Nanoscale".

Fabrication of a non-semiconductor photocatalytic system using dendrite-like plasmonic CuNi bimetal combined with reduced graphene oxide nanosheet for near-infrared photocatalytic H2 evolution

2017-09-26T13:18:00+00:00 September 26th, 2017|Categories: Publications|Tags: , |

J. Mater. Chem. A, 2017, Accepted ManuscriptDOI: 10.1039/C7TA06625B, PaperPiyong Zhang, Ting Song, Tingting Wang, Heping ZengThe field of photocatalytic hydrogen evolution has almost exclusively concentrated on semiconductor photocatalysts. However, non-semiconductor photocatalytic system has few reports due to few non-semiconductor catalysts and their poor

Published in: "Journal of Materials Chemistry A".

Tunable and high-purity room temperature single-photon emission from atomic defects in hexagonal boron nitride

2017-09-26T10:32:42+00:00 September 26th, 2017|Categories: Publications|Tags: |

Tunable and high-purity room temperature single-photon emission from atomic defects in hexagonal boron nitrideNature Communications, Published online: 26 September 2017; doi:10.1038/s41467-017-00810-2Inhomogeneous spectral distribution and multi-photon emission are currently hindering the use of defects in layered hBN as reliable single photon emitters. Here, the authors demonstrate strain-controlled wavelength tuning and increased single photon purity through suitable material processing.

Published in: "Nature Communications".

Graphene-based synthetic antiferromagnets and ferrimagnets

2017-09-26T10:32:42+00:00 September 26th, 2017|Categories: Publications|Tags: |

Graphene-based synthetic antiferromagnets and ferrimagnetsNature Communications, Published online: 26 September 2017; doi:10.1038/s41467-017-00825-9Antiferromagnetic spintronics may pave the way to innovative information storage devices with perpendicular coupling, however experimental demonstrations are still sparse. Here, the authors demonstrate a graphene-mediated perpendicular antiferromagnetic coupling between Fe and Co layers in a Fe/graphene/Co sandwich structure.

Published in: "Nature Communications".

A one-pot hydrothermal synthesis of graphene/CdS:Mn photocatalyst for photoelectrochemical sensing of glutathione

2017-09-26T10:29:06+00:00 September 26th, 2017|Categories: Publications|Tags: |

RSC Adv., 2017, 7,45792-45798DOI: 10.1039/C7RA09075G, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.Huili Ye, Hao Wang, Faqiong Zhao, Baizhao ZengThe GR/CdS:Mn composite was fabricated by a simple hydrothermal synthesis which illustrates excellent performance for the

Published in: "RSC Advances".