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Volume 4
Nano Research & Applications
ISSN: 2471-9838
Notes:
JOINT EVENT
October 04-05, 2018 Moscow, Russia
&
2
nd
Edition of International Conference on
26
th
International Conference on
Advanced Nanotechnology
Materials Technology and Manufacturing Innovations
Advanced Nanotechnology 2018
& Materials-Manufacturing 2018
October 04-05, 2018
Page 44
Configuring 2D materials by stacking order for energy harvesting and homo-junctions
I
t is well established that the optical and electronic structures of two dimensional transition metal dichalcogenide (2D
TMD) materials and perovskites often show very strong layer-dependent properties. It is less well-known that the
properties can also be tuned by stacking order, which allows us to build electro and optical devices with the same material
and the same thickness. Detailed understanding of the inter-layer interaction will help greatly in tailoring the properties
of 2D TMD materials for applications, e.g. in p-n junction, transistors, solar cells and LEDs. Raman/photoluminescence
(PL) spectroscopy and imaging have been extensively used in the study of nano-materials and nano-devices. They provide
critical information for the characterization of the materials such as electronic structure, optical property, phonon
structure, defects, doping and stacking sequence. In this presentation, we use Raman and PL techniques and electric
measurements, as well as simulation to study 2- and 3-layer 2D TMD samples. The Raman and PL spectra also show
clear correlation with layer-thickness and stacking sequence. Electrical experiments and
ab initio
calculations reveal
that difference in the electronic structures mainly arises from competition between spin-orbit coupling and interlayer
coupling in different structural configurations. 2D material homo-junctions using 2H and 3R stacking show clear p-n
junction behavior which opens up unique potential applications for nano-electronics and solar cells.
Biography
Ze Xiang Shen is a Professor in the School of Physical and Mathematical Sciences at Nanyang Technological University (NTU); Co-director at the Centre for
Disruptive Photonics Technologies. His main research areas include graphene, 2D materials and perovskites. He also works on graphene based composites
for energy harvesting (Li Ion batteries and supercapacitors) and nano electronics. He has won the NTU Nanyang Award for Research and Innovation and
Gold Medal for Research Excellence by Institute of Physics Singapore. He authored over 500 peer reviewed journal papers, six book chapters, edited five
books and over 300 conference papers.
zexiang@ntu.edu.sgZe Xiang Shen
Nanyang Technological University, Singapore
Ze Xiang Shen, Nano Res Appl 2018, Volume 4
DOI: 10.21767/2471-9838-C5-019