Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 3, Pages 1997-2003Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b02096
Keywords
thermoelectrics; tin telluride; calcium iodide; band convergence; dislocations; carrier and phonon scattering
Funding
- National Natural Science Foundation of China [51572098, 51632006, 51772109, 51872102]
- Fundamental Research Funds for the Central Universities [2018KFYXKJC002]
- Open Fund of State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology [2016-KF-5]
- Huazhong University of Science and Technology [5003110006]
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In this work, earth abundant Call compound has been applied to regulate the thermoelectric performance of SnTe by codoping in both the anion and cation sites for the first time. The carrier concentration has been effectively tuned to a reasonable range due to the electron donor nature of I-Te(+) point defects; on the other hand, the Seebeck coefficient has been significantly enhanced because of the resulted valence band convergence and band gap enlargement. More importantly, the phonon and carrier scattering have been tailored tactically, and a relatively high power factor with a significantly lowered thermal conductivity have been achieved simultaneously. In consequence, an enhanced figure of merit ZT similar to 1.2 at 873 K was attained in the SnTe-3% CaI2 sample.
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