报告时间：4月13日（周五）10:30
报告地点：科技创新大楼C501室
报告人：颜清宇
Achieving
Enhanced Thermoelectric Performance in SnSe2 nanostructures
Abstract: Thermoelectric
(TE) materials, which can convert heat into electricity and
generate temperature gradient for cooling purpose, have been extensively
studied for clean and reliable energy harvesting systems. I
will discuss some of the progress in my group regarding the devleopment of TE
materials including PbTe, carbon based ones. In particular, I will discuss on a
defect chemistry approach in SnSe2 nanoplate-based pellets, in which the
nanoplates show preferable orientation of the (001) planes along the primary
surface of the pellet (in-plane). After simultaneous introduction of Se
deficiency and Cl doping, the Fermi level of SnSe2 shifts towards the
conduction band, resulting in two orders of magnitude increase in carrier
concentration and a transition degenerate transport behaviour. In addition,
all-scale hierarchical phonon scattering centres, such as point defects,
nanograin boundaries, stacking faults and the layered nanostructures cooperate
to produce very low lattice thermal conductivity. As a result, an enhanced
in-plane ZTmax of 0.63 was achieved for 1.5 at% Cl doped SnSe1.95 pellet at 673
K, which is much higher than the corresponding in-plane ZT of pure SnSe2
(0.08).
Biography：
Academic
Qualification:
08/2000
- 12/2004 Ph.D., Materials Sci. &
Eng., State University of New York at Stony Brook, USA
08/2000
- 12/2004 B.Eng., Materials Sci.
& Eng., Nanjing University, China
Professional
Qualifications/Memberships:
Member,
IEEE Magnetic Society (Nov. 2003 – Nov. 2006)
Member,
Materials Research Society (April 2005 – 2008, 2010-now)
Joint
Treasurer, Singapore MRS (April 2014- 2016)
Member,
Electrochemical Society (January 2017-now)
Chair, Electrochemical Society, Singapore Section, (March 2017 – now)
Summary
of Working Experience:
03/2013 - present Associate
Professor, Nanyang Technological University, Singapore
02/2008 - 02/2013 Assistant
Professor, Nanyang Technological University, Singapore
01/2005 - 10/2007 Postdoc
Research Fellow, Rensselaer
Polytechnic Institute, USA
08/2000 - 12/2004 Research
Assistant, State University of New York at Stony Brook, USA
Awards
-
Tan Chin Tuan Exchange Fellowship in Engineering, 2012
-
Best Poster Award, Next Generation of Batteries Conference,
Wollongong, Australia, Aug 2016
-
Best Poster Award,
TMS/NY capital district, Albany, NY, USA (2005)
-
Annual Award of
International Magnetic Association, 2003
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