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| Type |
Symposium |
| Area |
Recent Trends in Solid State Chemistry |
| Room No. |
401호 |
| Time |
FRI 15:20-: |
| Code |
INOR2-3 |
| Subject |
Exceptionally off-stoichiometric Bismuth Telluride compounds for thermoelectric applications |
| Authors |
정인
서울대학교 화학생물공학부, Korea |
| Abstract |
Thermoelectric technology directly converts waste heat into electricity and is considered a promising means of sustainable energy generation. While most of the recent advances in the enhancement of the thermoelectric figure of merit (ZT) resulted from a decrease in lattice thermal conductivity by nanostructuring, there have been very few attempts to enhance electrical transport properties, namely, power factor. We employed nanochemistry to stabilize bulk Bi2Te3 that goes beyond phase equilibrium, i.e., phase-pure n-type K0.06Bi2Te3.18. Incorporated potassium and tellurium in Bi2Te3 far exceeds their solubility limit, leading to simultaneous increase in the electrical conductivity and the Seebeck coefficient along with decrease in the thermal conductivity. Consequently, a high power factor of ~43 W cm–1 K–2 and a high ZT > 1.1 at 323 K are achieved. Our current synthetic method can be used to produce a new family of materials with novel physical and chemical characteristics for various applications. |
| E-mail |
inchung@snu.ac.kr |
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119th General Meeting of the KCS