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Adv Mater. 2017 Jun;29(21). doi: 10.1002/adma.201602969. Epub 2017 Apr 3.

High Mobility 2D Palladium Diselenide Field-Effect Transistors with Tunable Ambipolar Characteristics.

Author information

1
Centre for Micro-/Nano-electronics (NOVITAS), School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
2
CINTRA UMI CNRS/NTU/THALES, Singapore, 637553, Singapore.
3
Centre for Programmed Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
4
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, P. R. China.
5
Department of Physics, National University of Singapore, Singapore, 117542, Singapore.
6
School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 639798, Singapore.

Abstract

Due to the intriguing optical and electronic properties, 2D materials have attracted a lot of interest for the electronic and optoelectronic applications. Identifying new promising 2D materials will be rewarding toward the development of next generation 2D electronics. Here, palladium diselenide (PdSe2 ), a noble-transition metal dichalcogenide (TMDC), is introduced as a promising high mobility 2D material into the fast growing 2D community. Field-effect transistors (FETs) based on ultrathin PdSe2 show intrinsic ambipolar characteristic. The polarity of the FET can be tuned. After vacuum annealing, the authors find PdSe2 to exhibit electron-dominated transport with high mobility (µe (max) = 216 cm2 V-1 s-1 ) and on/off ratio up to 103 . Hole-dominated-transport PdSe2 can be obtained by molecular doping using F4 -TCNQ. This pioneer work on PdSe2 will spark interests in the less explored regime of noble-TMDCs.

KEYWORDS:

2D materials; ambipolar; field-effect transistors; high mobility; palladium diselenide

PMID:
28370566
DOI:
10.1002/adma.201602969

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