Sb₂Te₃基热电薄膜的研究进展

基于热电薄膜的微型热电器件在微区制冷、温差发电等领域具有广阔应用前景。具有高功率因子、ZT值的热电薄膜对微型热电器件的性能至关重要。Sb₂Te₃基材料是室温下性能优异的p型热电材料。然而,目前Sb₂Te₃基薄膜的热电性能仍然不能满足实际应用的需求。简述了热电材料研究的相关背景,介绍了Sb₂Te₃的晶体结构,概述了Sb₂Te₃基薄膜的常用制备技术,从提高功率因子和降低热导率2方面综述了提高Sb₂Te₃基薄膜热电性能的方法。重点介绍了材料组织、微观结构与热电性能的关系,即缺陷、择优取向、纳米颗粒、超晶格、有机无机杂化等对Sb₂Te₃基薄膜热电性能的影响。此外,对Sb₂Te₃基热电薄膜的发展方向予以展望。

Micro thermoelectric devices based on thermoelectric films have promising applications in various fields such as micro-zone refrigeration and power generation. Thermoelectric films with high power factor and large ZT values are critical materials in these devices. Sb2Te3-based materials are outstanding p-type thermoelectric materials at room temperature. However, the thermoelectric properties of Sb2Te3-based thin films cannot meet the requirement of practical applications. The research background of thermoelectric materials is briefly introduced, the crystal structure of Sb2Te3 is discussed, the preparation techniques of Sb2Te3-based thin films are outlined, and the methods of improving the power factor and reducing the thermal conductivity of Sb2Te3-based thin films are summarized. In particular, the effects of microstructure on thermoelectric properties are focused on to elucidate the mechanism of improving thermoelectric properties of the films, which includes defects, preferential orientation, nanoparticles, superlattice, organic-inorganic hybridization, and so on. In addition, the future research directions for Sb2Te3-based thermoelectric thin films are discussed.