APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017;
New Orleans, Louisiana
Session B32: Field Effect Devices from 2D Materials
11:15 AM–2:15 PM,
Monday, March 13, 2017
Room: 295
Sponsoring
Unit:
DMP
Chair: Yaqing Bie, MIT
Abstract ID: BAPS.2017.MAR.B32.1
Abstract: B32.00001 : Electron transport and device physics in monolayer transition-metal dichalcogenides
11:15 AM–11:51 AM
Preview Abstract
Abstract
Author:
Xinran Wang
(Nanjing University)
Two-dimensional transition-metal dichalcogenides (TMDs) represent a
promising class of materials for electronic and photonic devices, benefiting
from their sizable bandgap of 1-2eV and ultrathin body. However, one of the
major issues is that the experimental mobility is much lower than the
theoretical phonon limit. It is speculated that the mobility is degraded by
many extrinsic factors.
In this talk I will present our systematic investigations on the electron
transport and field-effect transistors of monolayer TMDs (including
MoS$_{\mathrm{2}}$ and WS$_{\mathrm{2}})$. We find that the major extrinsic
mobility limiting factors are charged impurities, traps and point defects.
We develop a facile low-temperature thiol chemistry to repair the sulfur
vacancies and improve the interface quality, resulting in significant
reduction of the charged impurities and traps. In combination with high-k
dielectrics that further screens the charged impurities, we are able to
achieve record-high room-temperature mobilities of \textasciitilde
150cm$^{\mathrm{2}}$/Vs and 83cm$^{\mathrm{2}}$/Vs for monolayer
MoS$_{\mathrm{2}}$ and WS$_{\mathrm{2}}$, repectively. We further develop a
theoretical model to quantitatively correlate these extrinsic scattering
sources to measured electrical data. Our study shows that interface
engineering is critical for high-performance transistors based on 2D
semiconductors.
\begin{enumerate}
\item []References
\item Hao Qiu, Lijia Pan, Zongni Yao, Junjie Li, Yi Shi* and Xinran Wang*, \textit{Appl. Phys. Lett.}, 100, 123104 (2012).
\item Hao Qiu, Tao Xu, Zilu Wang, Wei Ren, Haiyan Nan, Zhenhua Ni, Qian Chen, Shijun Yuan, Feng Miao, Fengqi Song, Gen Long, Yi Shi, Litao Sun, Jinlan Wang* {\&} Xinran Wang*, \textit{Nature Comm.} 4, 2642 (2013).
\item Zhihao Yu, Yiming Pan, Yuting Shen, Zilu Wang, Zhun-Yong Ong, Tao Xu, Run Xin, Lijia Pan, Baigeng Wang, Litao Sun, Jinlan Wang, Gang Zhang, Yongwei Zhang, Yi Shi* {\&} Xinran Wang*\textit{, Nature Comm. 5, 5290 (2014)}.
\item Yang Cui, Run Xin, Zhihao Yu, Yiming Pan, Zhun-Yong Ong, Xiaoxu Wei, Junzhuan Wang, Haiyan Nan, Zhenhua Ni, Yun Wu, Tangsheng Chen, Yi Shi*, Baigeng Wang, Gang Zhang*, Yong-Wei Zhang {\&} Xinran Wang*, \textit{Adv. Mater. 27, 5230 (2015)}.
\item Zhihao Yu, Zhun-Yong Ong, Yiming Pan, Yang Cui, Run Xin, Yi Shi*, Baigeng Wang, Yong-Wei Zhang, Gang Zhang* {\&} Xinran Wang*, \textit{Adv. Mater. 28, 547 }(2016).
\end{enumerate}
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2017.MAR.B32.1