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Title: High thermoelectric performance of p-type Bi0.5Sb1.5Te3 films on flexible substrate
Authors: Parashchuk, T.
Kostyuk, O.
Nykyruy, L.
Dashevsky, Z.
Никируй, Любомир Іванович
Keywords: Bi0.5Sb1.5Te3 semiconductor
Flexible thermoelectric
Thermoelectric properties
Thin film
Issue Date: 1-Oct-2020
Publisher: Materials Chemistry and Physics (Elsevier Ltd)
Citation: Parashchuk, T., Kostyuk, O., Nykyruy, L. and Dashevsky, Z., 2020. High thermoelectric performance of p-type Bi0. 5Sb1. 5Te3 films on flexible substrate. Materials Chemistry and Physics, 253, p.123427.
Abstract: 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. © 2020 Elsevier B.V.
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