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High‐Performance Monolayer MoS 2 Films at the Wafer Scale by Two‐Step Growth
Author(s) -
Xu Xiangming,
Das Gobind,
He Xin,
Hedhili Mohamed Nejib,
Fabrizio Enzo Di,
Zhang Xixiang,
Alshareef Husam N.
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201901070
Subject(s) - wafer , materials science , monolayer , optoelectronics , hysteresis , semiconductor , transistor , nanotechnology , field effect transistor , electrical engineering , condensed matter physics , voltage , physics , engineering
Abstract To realize multifunctional devices at the wafer scale, the growth process of monolayer (ML) 2D semiconductors must meet two key requirements: 1) growth of continuous and homogeneous ML film at the wafer scale and 2) controllable tuning of the properties of the ML film. However, there is still no growth method available that fulfills both of these criteria. Here, the first report is presented on the preparation of continuous and uniform ML MoS 2 films through a two‐step process at the wafer scale. Unlike in previous ML MoS 2 film growth processes, the ML MoS 2 film can be uniformly modulated across the wafer in terms of material structure and composition, exciton state, and electronic transport performance. A significant result is that the high‐quality wafer‐scale ML MoS 2 films realize superior electronic performance compared to reported two‐step‐grown films, and it even matches or exceeds reported ML MoS 2 films prepared by other processes. The transistor performance of the optimized ML film achieves a field effect mobility of 10 to 30 cm 2 V −1 s −1 , an on/off current ratio of about 10 7 , and hysteresis as low as 0.4 V.