Dr. LI Yang from School of Materials Science and Engineering was awarded the first Doctoral Dissertation Award for excellence from the Chinese Materials Research Society

2017/09/24

Reported by: ZHANG Yan
Translated by: REN Shaorui
Edited by: D. Parker
Date: September 19, 2017

In the award ceremony for the first Doctoral Dissertation Award for excellence of the Chinese Materials Research Society, the dissertation titled Electrical and Optical Properties of Two-dimensional Materials of MoS2, WSe2 and Related Heterojunction was chosen as one of the 10 selected dissertations. It was written by 2016 PhD graduate LI Yang, with the instruction of Professor ZHEN Liang from the School of Materials Science and Engineering.

The two-dimensional materials such as MoS2 and WSe2 studied by Dr. Li Yang have the potential for a wide application in the field of electronic and optoelectronic nano devices due to their unique and novel physical and chemical properties. Based on the electrical contact behavior of two-dimensional materials and metal, the corresponding relationship between the work function of MoS2 nanometer wafers and the interlayer charge shielding effect was studied and the carrier concentration of MoS2 was modulated by a chemical modification method. This provided a basis for modulation of the contact potential barrier and design of functional devices based on electrical contact. LI Yang takes MoS2/Si, MoS2/graphene, WSe2/graphene and WSe2/MoS2 as the research object and illustrates the interlayer relaxation and interlayer coupling mechanism by changing the interface structure of band-lineup exciton behavior modulation heterostructures, laying the foundation for the development of new heterostructure optoelectronic devices and the understanding of the physical meaning of heterogeneous structures.

During his Ph. D. studies, LI Yang published 7 dissertations as the first author. One of these was selected for the list of popular papers for the May 2016 Advanced Functional Materials. It was also reported as a bright spot by the website Materials View China. What's more, related research results were cited more than 150 times by scholars from such universities and scientific research institutions as Northwestern University, California Institute of Technology, Stanford University, Berkeley National Laboratory.