Carrier mobility tuning of MoS2 by strain engineering in CVD growth process

Strain engineering is proposed to be an effective technology to tune the properties of two-dimensional (2D) transition metal dichalcogenides (TMDCs). Conventional strain engineering techniques (e.g., mechanical bending, heating) cannot conserve strain due to their dependence on external action, which thereby limits the application in electronics. In addition, the theoretically predicted strain-induced tuning of electrical performance of TMDCs has not been experimentally proved yet. Here, a facile but effective approach is proposed to retain and tune the biaxial tensile strain in monolayer MoS2 by adjusting the process of the chemical vapor deposition (CVD). To prove the feasibility of this method, the strain formation model of CVD grown MoS2 is proposed which is supported by the calculated strain dependence of band gap via the density functional theory (DFT). Next, the electrical properties tuning of strained monolayer MoS2 is demonstrated in experiment, where the carrier mobility of MoS2 was increased by two orders (similar to 0.15 to similar to 23 cm(2).V-1.s(-1)). The proposed pathway of strain preservation and regulation will open up the optics application of strain engineering and the fabrication of high performance electronic devices in 2D materials.

Automated summary

Strain engineering is proposed as an effective technology for tuning the properties of 2D TMDCs. A novel method of retaining and tuning biaxial tensile strain in monolayer MoS2 through adjusting the CVD process is suggested and experimentally validated. The proposed pathway shows promise in optics applications and high performance electronic device fabrication in 2D materials.