WCU Department of Energy Science,Sungkyunkwan University,Jangan-gu,Suwon 440-746,South Korea

Sang II Kim; Sungwoo Hwang; Jong Wook RohKyunghan AhnDong-Hee YeonKyu Hyoung LeeSung Wng Kim

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WCU Department of Energy Science,Sungkyunkwan University,Jangan-gu,Suwon 440-746,South Korea

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We present experimental evidence of enhancement of thermoelectric properties in tellurium(Te)nanoparticle-embedded bismuth antimony telluride(BiSbTe)alloys. Bi_(0.5)Sb_(1.5)Te_3 films with a high density of Te particles of 10-20 nm size were prepared by growth of alternating multilayers of ultrathin Te and Bi_(0.5)Sb_(1.5)Te_3. As the amount of Te nanoinclusions increased up to ~15,the Seebeck coefficient and thermoelectric power factor were increased. Based on the concept of band bending at heterointerfaces as a carrier energy filter,the energy relaxation calculation was made to confirm that the Te nanoinclusions result in a carrier energy filtering effect in p-type bismuth antimony telluride. In addition,thermal conductivities were reduced in the Te-embedded samples,permitting possible further enhancement of the thermoelectric figure of merit. The advantages of Te nanoinclusions in p-type Bi~(0.5)Sb_(1.5)Te_3 alloys on thermoelectric performance are experimentally realized by both electron- and phonon scattering.

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《Journal of Materials Research》 |2012年第19期|2449-2456|共8页
作者
Sang II Kim; Sungwoo Hwang; Jong Wook RohKyunghan AhnDong-Hee YeonKyu Hyoung LeeSung Wng Kim;
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作者单位

Advanced Materials Research Center,Samsung Advanced Institute of Technology,Samsung Electronics,Yong-In,Gyung-gi 446-712,South Korea;

WCU Department of Energy Science,Sungkyunkwan University,Jangan-gu,Suwon 440-746,South Korea;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类工程材料学;
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WCU Department of Energy Science,Sungkyunkwan University,Jangan-gu,Suwon 440-746,South Korea

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