2021年
Enhancement of Thermoelectric Properties of n-Type Bi<inf>2</inf>Te<inf>3- x</inf>Se<inf>x</inf>by Energy Filtering Effect
ACS Applied Energy Materials
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- 巻
- 4
- 号
- 10
- 開始ページ
- 11819
- 終了ページ
- 11826
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acsaem.1c02560
A pair of n-type Bi2Te3-xSex and p-type (Bi,Sb)2Te3 is known as a promising candidate for assembling a high thermoelectric efficiency module operating at near room temperature. While the dimensionless figure of merit (zT) of p-type (Bi,Sb)2Te3 is commonly larger than 1.0, n-type Bi2Te3-xSex has a lower zT value of μ0.8 at room temperature. Here, we aim to enhance the zT of n-type Bi2Te3-xSex through the energy filtering effect that can improve the Seebeck coefficient by adding Au. In the Bi2Te2.8Se0.2 + 5 at % Au composite, the Seebeck coefficient is significantly improved, and the electrical resistivity does not change significantly, leading to an approximately twice as high power factor as that of the non-Au-added one at near room temperature. Also, the addition of Au suppresses the thermal conductivity. These advantages result in a maximum zT of over 1.0 at room temperature and average zT value of 1.05 at T = 300-400 K, an μ75% improvement, which is comparable to those of the reported n-type Bi2Te3-based materials. Also, Au addition shows no negative effect on the mechanical properties as well as high-temperature stability of Bi2Te3-xSex. These results indicate that Au addition is a promising method to improve the thermoelectric properties of n-type Bi2Te3-xSex used for assembling a practical thermoelectric module operating at near room temperature.
- リンク情報
- ID情報
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- DOI : 10.1021/acsaem.1c02560
- eISSN : 2574-0962
- SCOPUS ID : 85117339078