Institute of Thin Film Physics and Applications, Shenzhen Key Laboratory of Advanced Thin Films and Applications, College of Physics and Energy, Shenzhen University, 518060, China.
Nanoscale. 2018 Jul 19;10(28):13511-13519. doi: 10.1039/c8nr02065e.
The performance of organic-inorganic hybrid thermoelectric thin films can be dramatically enhanced by optimizing energy filtering and carrier transport states at the organic-inorganic interfaces. In this work, p-type "Sb2Te3/CH3NH3I/Sb2Te3" multilayer thin films were firstly fabricated with varied contents of CH3NH3I, and then an annealing process was used in order to form homogeneous organic-inorganic hybrid thin films. The results revealed that the introduced organic component can promote thin film growth and develop a dense nanostructure with improved crystallinity, thus resulting in a significantly increased Seebeck coefficient and a reduced thermal conductivity as a result of the optimized electronic transport characteristics and enhanced effects of phonon scattering. As is expected, the thermoelectric performance of the hybrid-nanocomposite films is enhanced, achieving the maximum ZT value of 1.55 at a temperature of 413 K, which is several times higher than that of the as-fabricated film, thereby suggesting that the proposed strategy can be applied as an efficient method for the preparation of high-performance thermoelectric thin films.
通过优化有机-无机界面处的能量过滤和载流子输运状态，可以显著提高有机-无机杂化热电薄膜的性能。在这项工作中，首先制备了不同 CH3NH3I 含量的 p 型“Sb2Te3/CH3NH3I/Sb2Te3”多层薄膜，然后通过退火工艺形成均匀的有机-无机杂化薄膜。结果表明，引入的有机成分可以促进薄膜生长并形成具有改善结晶度的致密纳米结构，从而导致塞贝克系数显著增加，热导率降低，这是由于电子输运特性得到优化和声子散射增强。不出所料，杂化纳米复合材料薄膜的热电性能得到了提高，在 413 K 的温度下达到了 1.55 的最大 ZT 值，比制备的薄膜高几个数量级，这表明所提出的策略可以作为制备高性能热电薄膜的有效方法。
