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열전도도 저감 기반의 열전소재 성능 증대 전략 수립을 위한 수식적 이해

Formulaic Understanding to Make a Strategy of Thermal Conductivity Reduction for Enhancing the Performance of Thermoelectric Materials

  • 피지희 (연세대학교 신소재공학과) ;
  • 최명식 (경북대학교 에너지 신소재.화학공학부) ;
  • 이규형 (연세대학교 신소재공학과)
  • Pi, Ji-Hee (Department of Materials Science and Engineering, Yonsei University) ;
  • Choi, Myung Sik (School of Energy Materials and Chemical Engineering, Kyungpook National University) ;
  • Lee, Kyu Hyoung (Department of Materials Science and Engineering, Yonsei University)
  • 투고 : 2022.12.23
  • 심사 : 2022.12.30
  • 발행 : 2022.12.30

초록

고체상태에서 열에너지과 전기에너지를 직접적이고 가역적으로 변환할 수 있는 열전소재는 전기전도특성인 전기전도도 및 제벡계수와 열전도특성인 열전도도에 의해 그 성능이 결정된다. 하지만 전기전도도, 제벡계수, 열전도도는 소재의 조성, 결정구조 및 전자구조에 의해 결정되며, 서로 상관관계를 나타내기 때문에 성능 증대를 위한 효과적인 전략수립에 어려움이 있다. 본 논문에서는 열전소재의 성능과 관련한 수식에 대한 이해를 바탕으로 실험 결과와 연계하여 열전도도 저감 관점에서 효과적인 결함제어 기반 열전소재 성능 증대 전략을 수립할 수 있는 방법론을 제공하고자 한다.

Thermoelectric materials can directly convert a temperature gradient to an electrical energy and vice-versa, and their performance is determined by the electrical conductivity, Seebeck coefficient, and thermal conductivity. However, it is difficult to establish an effective strategy for enhancing performance since electrical conductivity, Seebeck coefficient, and thermal conductivity are strongly dependent on the composition, crystal structure, and electronic structure of the material, and show a correlation with each other. Herein, based on the understanding of the formulas related to the performance of thermoelectric materials, we provide a methodology to establish feasible defect engineering strategies of thermal conductivity reduction for improving the performance of thermoelectric materials in connection with the experimental results.

키워드

과제정보

This work was supported by Korea Institute for Advancement of Technology(KIAT) grant funded by the Korea Government(MOTIE) (P0002019, Human Resource Development Program for Industrial Innovation). This research was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2019R1A6A1A11055660).

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