TY - JOUR
T1 - High thermoelectric performance of p-type Bi0.5Sb1.5Te3 films on flexible substrate
AU - Parashchuk, T.
AU - Kostyuk, O.
AU - Nykyruy, L.
AU - Dashevsky, Z.
N1 - Funding Information:
This research was supported by the Ministry of Education and Science of Ukraine for young scientists “Technology of thin-film thermoelectric micromodules based on multicomponent compounds with quantum-size effects” (state registration number 0119U100062 ). T.P. acknowledges support by Foundation for Polish Science under TEAM-TECH/2016-2/14 Grant.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - Bi2Te3-based compounds are excellent candidates for the low-temperature thermoelectric application. In the present work, a technology for fabrication of p-Bi0.5Sb1.5Te3 films with high thermoelectric efficiency on a thin flexible polyimide substrate has been developed. The preparation of films was carried out by a flash evaporation method. A systematic study of the transport properties (Hall coefficient, Seebeck coefficient, electrical conductivity, transverse Nernst coefficient) over the entire temperature range of 80–400 K for p-Bi0.5Sb1.5Te3 films has been performed. The power factor (PF) for the Bi0.5Sb1.5Te3 (doped by 0.5 wt % Te) film reaches the value of ~30.4 μW cm−1K−2, which is among the highest values of the PF reported in the literature to date for a film on a flexible polyimide (amorphous) substrate. The measured thermal diffusivity along the film allowed us to accurately estimate the figure of merit Z for p-Bi0.5Sb1.5Te3 films considering the anisotropic effect of Bi2Te3-based materials. A significant enhancement of Z up to ~3.0 × 10−3 K has been obtained for these films, which is state-of-the-art even compared to bulk materials. This research can provide insight into the fabrication of p-type branch of the Film Thermoelectric Modules (FTEM), which could be a candidate for application in micro-scale thermoelectric generators.
AB - Bi2Te3-based compounds are excellent candidates for the low-temperature thermoelectric application. In the present work, a technology for fabrication of p-Bi0.5Sb1.5Te3 films with high thermoelectric efficiency on a thin flexible polyimide substrate has been developed. The preparation of films was carried out by a flash evaporation method. A systematic study of the transport properties (Hall coefficient, Seebeck coefficient, electrical conductivity, transverse Nernst coefficient) over the entire temperature range of 80–400 K for p-Bi0.5Sb1.5Te3 films has been performed. The power factor (PF) for the Bi0.5Sb1.5Te3 (doped by 0.5 wt % Te) film reaches the value of ~30.4 μW cm−1K−2, which is among the highest values of the PF reported in the literature to date for a film on a flexible polyimide (amorphous) substrate. The measured thermal diffusivity along the film allowed us to accurately estimate the figure of merit Z for p-Bi0.5Sb1.5Te3 films considering the anisotropic effect of Bi2Te3-based materials. A significant enhancement of Z up to ~3.0 × 10−3 K has been obtained for these films, which is state-of-the-art even compared to bulk materials. This research can provide insight into the fabrication of p-type branch of the Film Thermoelectric Modules (FTEM), which could be a candidate for application in micro-scale thermoelectric generators.
KW - BiSbTe semiconductor
KW - Flexible thermoelectric
KW - Thermoelectric properties
KW - Thin film
UR - http://www.scopus.com/inward/record.url?scp=85086636386&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2020.123427
DO - 10.1016/j.matchemphys.2020.123427
M3 - Article
AN - SCOPUS:85086636386
SN - 0254-0584
VL - 253
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
M1 - 123427
ER -