1. 제 목 : Direct energy conversion between thermal and electrical energy

2. 연 사 : 이호현
(Department of Mechanical Engineering,Massachusetts Institute of Technology)

3. 일 시 : 2009년 1월 20일(화) 16:00 ~ 17:00

4. 장 소 : 301동 1512호

5. 내 용 :
Direct energy conversion between thermal and electrical energy based on
thermoelectric effects is attractive for potential applications in waste heat
recovery and environmentally-friendly refrigeration. The energy conversion
efficiency depends on the dimensionless figure of merit of thermoelectric
materials, ZT, which is proportional to the electrical conductivity, the square of
the Seebeck coefficient, and the inverse of the thermal conductivity. Currently,
the low ZT values of available materials restrict the efficient applications of this
technology. However, significant enhancements in ZT were recently reported in
nanostructured materials such as superlattices mainly due to their low thermal
conductivities. According to recent studies, the reduced thermal conductivity
of nanostructures is attributed to the large number of interfaces at which
phonons are scattered. Based on this idea, nanocomposites are also expected
to have a lower thermal conductivity than their bulk counterparts, but with low
fabrication cost just by mixing nano sized particles. In this presentation, I’ll
demonstrate the mechanisms for ZT enhancement in SiGe nanocomposites by
modeling along with experimental evidence.

6. 연사약력 :
- 2003. 서울대학교 기계항공공학부 학사
- 2005. MIT 기계공학과 석사
- 현재 MIT 기계공학과 Prof. Gang Chen Lab 박사과정 (2009년 6월 졸업예정)

7. 문 의 : 기계항공공학부 김호영 교수(☏ 880-9286)