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Enhanced thermoelectric properties of Sb2Te3 and Bi2Te3 films for flexible thermal sensors.
- Source :
-
Journal of Alloys & Compounds . Feb2019, Vol. 774, p1102-1116. 15p. - Publication Year :
- 2019
-
Abstract
- Abstract Improved thermoelectric properties of p-Sb 2 Te 3 and n-Bi 2 Te 3 films deposited by thermal co-evaporation at 503 K and 543 K, respectively, are reported, by using two types of substrate (borosilicate glass and 25 μm - Kapton® polyimide). Seebeck coefficients of 194 μV K−1 and - 233 μV K−1 and electrical conductivities of 3.2 × 104 (Ω m)−1 and 5.0 × 104 (Ω m)−1, lead to optimized power factors of 1.2 × 10−3 W K−2 m−1 and 2.7 × 10−3 W K−2 m−1, measured at 298 K, for flexible Sb 2 Te 3 and Bi 2 Te 3 films, respectively. The power factor value increases until a maximum of 2.3 × 10−3 W m−1 K−2 for the p-type film, and to 5.9 × 10−3 W m−1 K−2 for the n-type film, at 373 K, respectively. An improvement of more than two times on the power factor value is observed when compared with the actual state-of-art for flexible Sb 2 Te 3 and Bi 2 Te 3 films, at room temperature, with thickness below 1 μm. A flexible thermopile sensor based on p - n films is presented, into possible thermal sensing. The thermoelectric device shows a responsivity of 0.05 V W−1 and a specific detectivity of 1.6 × 107 cm √Hz W−1. Highlights • Telluride films were fabricated on borosilicate glasses and Kapton® polyimide. • Power factors of 1.2 × 10−3 W K−2 m−1 (Sb 2 Te 3) and 2.7 × 10−3 W K−2 m−1 (Bi 2 Te 3). • Flexible thermopile sensor with a specific detectivity of 1.6 × 107 cm √Hz W−1. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 774
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 133217505
- Full Text :
- https://doi.org/10.1016/j.jallcom.2018.09.324