| 학회 |
한국재료학회 |
| 학술대회 |
2021년 봄 (05/12 ~ 05/14, 광주 김대중컨벤션센터) |
| 권호 |
27권 1호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Powder-free fabrication of the reliable Bi2Te3-based thermoelectric alloys |
| 초록 |
Precise control of carrier density is essential to synthesize high-performance thermoelectric materials. Here, we explore a powder-free fabrication technique to synthesize n-type bismuth tellurium selenides, combining a cold deformation and a hot extrusion. The cold deformation enables controlling the electron density in the range of ~1019-cm-3 via the formation of intrinsic point defects, and the hot extrusion allows texturing the microstructure to enhance the electrical conductivity, hence a large power factor of ＞ 5×10-3 W-m-1-K-2 . We confirm that our process is very reproducible, and the properties of the samples are stable without aging even after thermal stresses. Using this method, we can decouple the relationship between bandgap, carrier density, and composition to improve the high-temperature thermoelectric property. Moreover, we demonstrate the fabrication of high-performance thermoelectric materials from low-graded, raw materials by modifying the degree of the mechanical deformation to reach an optimum carrier density. Equipped with the ability to control electron density, we constructed a thermoelectric property map of the n-type (1-x)Bi2Te3 - xBi2Se3 alloy system, to provide guidance on designing high performance thermoelectric modules for various applications. Our work provides a promising approach to synthesizing thermoelectric materials in the reproducible and adaptable way. |
| 저자 |
Sung-Jin Jung1, Seung-hyeok Lee2, JoonChul Shin1, Hyung-Jin Choi2, Soo Young Jung1, Ruiguang Ning2, Min seok Kim1, Seong Keun Kim2, Jin-Sang Kim1, Seung-Hyub Baek2
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| 소속 |
1Electronic Materials Research Centers, 2Korea Institute of Science and Technology |
| 키워드 |
Powder; thermoelectric; Bi<SUB>2</SUB>Te<SUB>3</SUB>
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| E-Mail |
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