Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 774, Issue -, Pages 1102-1116Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.09.324
Keywords
Bismuth telluride; Antimony telluride; Kapton (R) substrate; Thermoelectric effect; Flexible thermal sensor
Categories
Funding
- FCT [SFRH/BPD/95905/2013, SFRH/BD/121679/2016, UID/EEA/04436/2013]
- FEDER funds through the COMPETE 2020 - Programa Operacional Competitividade e Internacionalizacao (POCI) [POCI-01-0145-FEDER-006941, NAN/5414/2014 (POCI-01-0145-FEDER-016723)]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/121679/2016] Funding Source: FCT
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Improved thermoelectric properties of p-Sb2Te3 and n-Bi2Te3 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 mu m - Kapton (R) polyimide). Seebeck coefficients of 194 mu V K-1 and - 233 mu V K-1 and electrical conductivities of 3.2 x 10(4) (Omega m)(-1) and 5.0 x 10(4) (Omega m)(-1) , lead to optimized power factors of 1.2 x 10(-3) W K-2 m(-1) and 2.7 x 10(-3) W K-2 m(-1), measured at 298 K, for flexible Sb2Te3 and Bi2Te3 films, respectively. The power factor value increases until a maximum of 2.3 x 10(-3) W m(-1) K-2 for the p-type film, and to 5.9 x 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 Sb2Te3 and Bi2Te3 films, at room temperature, with thickness below 1 mu m. A flexible thermopile sensor based on p - n films is presented, into possible thermal sensing. The thermoelectric device shows a responsivity of 0.05 VW-1 and a specific detectivity of 1.6 x 10(7) cm root Hz W-1. (C) 2018 Elsevier B.V. All rights reserved.
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