Composition-dependent charge transport and temperature-dependent density of state effective mass interpreted by temperature-normalized Pisarenko plot in Bi2−xSbxTe3 compounds
Tae-Ho An,
Young Soo Lim,
Mi Jin Park,
Jang-Yeul Tak,
Soonil Lee,
Hyung Koun Cho,
Jun-Young Cho,
Chan Park,
Won-Seon Seo
Affiliations
Tae-Ho An
Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, South Korea
Young Soo Lim
Department of Materials System Engineering, Pukyong National University, Busan 48547, South Korea
Mi Jin Park
Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, South Korea
Jang-Yeul Tak
Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, South Korea
Soonil Lee
Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, South Korea
Hyung Koun Cho
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, South Korea
Jun-Young Cho
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea
Chan Park
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea
Won-Seon Seo
Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, South Korea
Composition-dependent charge transport and temperature-dependent density of state effective mass-dependent Seebeck coefficient were investigated in Bi2−xSbxTe3 (x = 1.56-1.68) compounds. The compounds were prepared by the spark plasma sintering of high-energy ball-milled powder. High-temperature Hall measurements revealed that the charge transport in the compounds was governed dominantly by phonon scattering and influenced additionally by alloy scattering depending on the amount of Sb. Contrary effects of Sb content on the Seebeck coefficient were discussed in terms of carrier concentration and density of state effective mass, and it was elucidated by temperature-normalized Pisarenko plot for the first time.
