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  • 09월 20일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제126회 대한화학회 학술발표회 및 총회 Enhancing p-type thermoelectric properties of polycrystalline Bi2Te3-based materials via MnTe2 incorporation

2020년 9월 3일 17시 00분 44초
MAT.P-493 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 21일(수) 17:30~18:00
Materials Chemistry
저자 및
Hyungseok Lee, Chung In1,*
School of Chemical and Biological Engineering, Seoul National University, Korea
1School of Chemical & Biological Engineering, Seoul National University, Korea
Bi2Te3-based materials have been known for representative thermoelectric material near ambient temperature. However, commercial applications of Bi2Te3-based thermoelectric modules have been limited due to the low performance. The energy conversion efficiency of the modules is evaluated by thermoelectric figure of merit (ZT) over the entire operating temperature region, it is therefore of importance to increase average ZT in the full range of operating temperature. Herein, we report the enhancement of Bi2Te3 thermoelectric system via inclusion of MnTe2. MnTe2 incorporation simultaneously increases both carrier concentration and mobility unlike the general behavior of semiconductors, which results in enhancement of power factor up to ~ 45 μW cm-1 K-2 at 327 K. At the same time, It also significantly decreases lattice thermal conductivity down to ~0.50 W m-1 K-1 at 373 K. Through the synergetic effects, Bi2Te3-MnTe2 system accomplish a remarkably high average ZT of ~1.21 from 300 to 500 K and ZTmax ~ 1.34 at 400 K .