Thermoelectric behaviour of Bi-Te films on polymer substrates DC-sputtered at room-temperature in moving web deposition

SURFACE & COATINGS TECHNOLOGY

卷:385

Article

Tao, Xudong¹  Wan, Kening²  Deru, Joshua¹  Bilotti, Emiliano²  Assender, Hazel E.¹ 

[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

[2] Queen Mary Univ London, Sch Engn & Mat Sci, Mile End Rd, London E1 4NS, England

关键词: Flexible/wearable electronics;    Room-temperature sputtering;    Bismuth telluride;    Thermoelectric materials;    Roll-to-roll processing;   

DOI  :  10.1016/j.surfcoat.2020.125393

来源: Elsevier

【 摘 要 】

High-throughput roll-to-roll processing could be used to scale up the manufacture of flexible thermoelectric generators. Very thin thermoelectric layers can be manufactured at high throughput speed and low cost and, most importantly, are predicted to possess better thermoelectric properties than thicker layers. Here we present a study on a series of bismuth telluride films of different thickness (few nm to 370 nm), deposited on polymer substrates at room temperature using DC magnetron sputtering. Unlike previous studies of deposition of bismuth telluride films onto heated substrates, an island-growth mode, indicated by AFM, was observed for Bi-Te films grown at room temperature. A period of growth in which the layer only partially coats the substrate, with only imperfect connections between islands, was observed. In this partially coated region, the coating exhibited an extremely high Seebeck coefficient. An energy barrier mechanism, similar to the interface effect in nanomaterials, is proposed to explain this phenomenon, along with a possible quantum confinement effect. We found that a thinner Bi-Te film could generate a greater power factor because of a quasi-decoupling of Seebeck coefficient and electrical resistivity. In addition, ensuring that the sample passed directly under the sputtering target, and using a substrate smoothed with an acrylate layer were found to improve film properties, thus enhancing thermoelectric behaviour.

【 授权许可】

Free