High Mobility WS2 Transistors Realized by Multilayer Graphene Electrodes and Application to High Responsivity Flexible Photodetectors

Adha Sukma Aji, Pablo Solís-Fernández, Hyun Goo Ji, Kenjiro Fukuda, Hiroki Ago

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The electrical contact is one of the main issues preventing semiconducting 2D materials to fulfill their potential in electronic and optoelectronic devices. To overcome this problem, a new approach is developed here that uses chemical vapor deposition grown multilayer graphene (MLG) sheets as flexible electrodes for WS2 field-effect transistors. The gate-tunable Fermi level, van der Waals interaction with the WS2, and the high electrical conductivity of MLG significantly improve the overall performance of the devices. The carrier mobility of single-layer WS2 increases about a tenfold (50 cm2 V−1 s−1 at room temperature) by replacing conventional Ti/Au metal electrodes (5 cm2 V−1 s−1) with the MLG electrodes. Further, by replacing the conventional SiO2 substrate with a thin (1 µm) parylene-C flexible film as insulator, flexible WS2 photodetectors that are able to sustain multiple bending stress tests without significant performance degradation are realized. The flexible photodetectors exhibited extraordinarily high gate-tunable photoresponsivities, reaching values of 4500 A W−1, and with very short (<2 ms) response time. The work of the heterostacked structure combining WS2, graphene, and the very thin polymer film will find applications in various flexible electronics, such as wearable high-performance optoelectronics devices.

Original languageEnglish
Article number1703448
JournalAdvanced Functional Materials
Volume27
Issue number47
DOIs
Publication statusPublished - Dec 15 2017

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Graphite
Photodetectors
Graphene
photometers
graphene
Multilayers
Transistors
transistors
Electrodes
electrodes
optoelectronic devices
Optoelectronic devices
Flexible electronics
Carrier mobility
Field effect transistors
carrier mobility
Fermi level
electronics
Polymer films
Chemical vapor deposition

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

High Mobility WS2 Transistors Realized by Multilayer Graphene Electrodes and Application to High Responsivity Flexible Photodetectors. / Aji, Adha Sukma; Solís-Fernández, Pablo; Ji, Hyun Goo; Fukuda, Kenjiro; Ago, Hiroki.

In: Advanced Functional Materials, Vol. 27, No. 47, 1703448, 15.12.2017.

Research output: Contribution to journalArticle

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