10/26(一)專題演講公告

演講人:吳欣潔 博士

服務單位:國立交通大學材料科學與工程學系所

演講題目:Phase diagram engineering - A New Avenue Towards High Performance Thermoelectric Materials

演講時間109年10月26(星期一)早上1020

演講地點工綜館203國際演講廳

個人學歷

國立清華大學 / 化學工程學系 / 博士
國立清華大學 / 化學工程學系 / 學士

個人經歷

國立交通大學 / 材料科學與工程學系(所)/ 副教授(現職)
國立中山大學 / 材料與光電科學學系 / 副教授
國立中山大學 / 材料與光電科學學系 / 助理教授
國立清華大學 / 化學工程學系 / 博士後

演講摘要

To cope with the global energy shortage and environmental concern, the development of green energy is urgent. The thermoelectric materials (TE) can convert waste heat into electricity via the Seebeck effect, which plays an important role in easing the energy issues. Nevertheless, there is still room for improvement when it comes to the conversion efficiency and thermal stability of a TE material and TE module. Herein, a new thermodynamic approach is adopted, which aims to depict the temperature-dependent solubility for a specific TE compound by a phase diagram. In other words, the phase diagram acts as a map guiding the composition and synthesis route for our TE materials, which allows us to rejuvenate and re-visit the well-established Bi2Te3-based, PbTe-based, GeTe-based, and Zn4Sb3-based TE materials. By determining the solubility range of certain dopants, including the Ag, Cu, In and Ga in the above-mentioned TE compounds, the TE properties can be optimized and the resultant figure-of-merit (ZT) is enhanced. For example, carrier optimization could be realized by adjusting the solubility content in Cu-Bi2Te3, Ga-PbTe and In- Zn4Sb3, which boost the power factor (PF = S2ρ-1). Meanwhile, the reduction in lattice thermal conductivity is attained by introducing multiple-scale of defects. Synergistically, the figure-of-merit for our n-type Ga-PbTe, n-type Cu-Bi2Te3 and p-type Sb-GeTe can be elevated to a record high value.

2020-10-26-speech