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2024 Vol.34, Issue 9 Preview Page

Research Paper

Thermoelectric Properties of In and Cr Co-Doped BiSbTe3

In, Cr 동시 도핑에 따른 BiSbTe3 소재의 열전성능지수 증대

Changwoo Lee1*
,
Junsu Kim1*
,
Minsu Heo1
,
Sang-il Kim1†
,
Hyun-Sik Kim1†
이 창우1*
,
김 준수1*
,
허 민수1
,
김 상일1†
,
김 현식1†
1Department of Materials Science and Engineering, University of Seoul, Seoul 02504, Republic of Korea
1서울시립대학교 신소재공학과
†Corresponding author E-Mail : sang1.kim@uos.ac.kr (S.-i. Kim, Univ. Seoul) hyunsik.kim@uos.ac.kr (H.-S. Kim, Univ. Seoul)
*These two authors are equally contributed as first authors.
27 September 2024. pp. 448-455
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Abstract

We conducted a study on excessive doping of the Cr and In elements in Bi-Sb-Te materials satisfying the Hume-Rothery rule, and investigated the resulting electrical and thermal properties. From X-ray diffraction (XRD) results, we confirmed the formation of a single phase even with excessive doping. Through analysis of electrical properties, we observed the highest enhancement in electrical characteristics at y = 0.2, suggesting that the appropriate ratio of Bi-Sb significantly influences this enhancement. Using the Callaway-von Baeyer (CvB) model to assess scattering due to point defects, we calculated the experimental point defect scattering factor (ΓCvB.exp), which was notably high due to the substantial differences in volume and atomic weight between the substituted (Cr, In) and original (Bi, Sb) elements. Additionally, we conducted a single parabolic band (SPB) modeling analysis of materials with compositions y = 0.1 and 0.2, where, despite a decrease in density-of-states effective mass (md*) during the enhancement process from y = 0.1 to 0.2, a sharp increase in non-degenerate mobility (μ0) led to an 88 % increase in weighted mobility (μw). Furthermore, analyzing zT with respect to nH revealed a 51 % increase in zT at a composition of y = 0.2. This study confirmed a significant reduction in lattice thermal conductivity with the co-doping strategy, and with further compositional studies to improve electrical properties, we anticipate achieving high zT.

Keywords
thermoelectric
single parabolic band model
Callaway-von Baeyer model
lattice thermal conductivity
BiSbTe3
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 34
  • No :9
  • Pages :448-455
  • Received Date : 2024-08-29
  • Revised Date : 2024-08-29
  • Accepted Date : 2024-09-19
  • DOI :https://doi.org/10.3740/MRSK.2024.34.9.448
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