Published the Oct. 15, 2020

Phase Transition in a Memristive Suspended MoS2 Monolayer Probed by Opto-and Electro-Mechanics

In recent years, new 2D semiconductor materials have shown exotic and exciting electronic or optoelectronic properties with multiple applications. In particular, several interesting mechanisms can hybridize in the same device. We have develop a new probe of these 2D materials through mechanical vibrations with an optoelectromechanical platform. It will have the advantage of being extremely sensitive compared to any other existing solutions, intrinsic, local, and compatible with in-situ measurements of electronics and optoelectronics. In our case, we have used this probe to identify the origin of electronic memristive effects in a suspended MoS2 monolayer. We have demonstrated mechanically that this effect is linked to a local phase transition, for less than 1% of the material area. Also, the experiments and the numerical simulation demonstrate that this transition between the hexagonal (2H) and disordered octahedral (1T’) phases of MoS2 is associated with the presence and diffusion of sulfur vacancies in our samples. In fact, this method is almost universal because it is applicable to many phenomena of condensed matter.

Références :

Julien Chaste 1*, Imen Hnid 1, Chen Si2, Lama Khalil1, Alan Durnez1, Xavier Lafosse1, Meng-Qiang  Zhao3,  A.T.  Charlie  Johnson3,  Shengbai  Zhang4,  Junhyeok  Bang5**,  Abdelkarim Ouerghi 1

1 Université  Paris-Saclay,  CNRS,  Centre  de  Nanosciences  et  de  Nanotechnologies,  91120,Palaiseau, France.

2 School of Materials Science and Engineering, Beihang University, Beijing 100191, China

3 Department  of  Physics  and  Astronomy, University  of  Pennsylvania,  209S  33rd  Street, Philadelphia, Pennsylvania 19104 6396, United States

4 Department  of  Physics,  Applied  Physics,  &  Astronomy,  Rensselaer  Polytechnic  Institute, Troy, New York 12180, USA

5 Department of Physics, Chungbuk National University, Cheongju 28644, Republic of Korea

ACS nano.2020


* contact C2N : Julien Chaste