Achieving Ultralow Lattice Thermal Conductivity and High Thermoelectric Performance in Bi 2 Te 2.7 Se 0.3 Alloys via Introducing Organic & Inorganic Nanoparticles

作者：Tao Chen, Shujing Li, Ziyuan Wang, Zhenhua Ge, Yongsheng Zhang, Hongxing Xin, Di Li, Jian Zhang, Xiaoying Qin · 发表于：Small · 年份：2025 · DOI：10.1002/smll.202406695 · 被引用次数：3 · 研究领域：Advanced Thermoelectric Materials and Devices、Thermal properties of materials、Thermal Radiation and Cooling Technologies

Abstract N‐type Bi 2 Te 2.7 Se 0.3 (BTS) is a state‐of‐the‐art thermoelectric material owing to its excellent thermoelectric properties near room temperatures for commercial applications. However, its performance is restricted by its comparatively low figure of merit ZT . Here, it is shown that a 14% increase in power factor (PF) (at 300 K) can be reached through incorporation of inorganic GaAs nanoparticles due to enhanced thermopower originating from the energy‐dependent carrier scattering. Besides, further incorporation of organic nanophase PEDOT: PSS can reduce its lattice thermal conductivity by 59% due to the strong scattering of middle‐ and low‐frequency phonons. As a result, a peak ZT value of ZT max ≈ 1.31 (at 373 K) and an average ZT ave ≈ 1.10 (300–473 K) are achieved for the BTS/(0.4 wt.% GaAs + 0.5 wt.% PEDOT: PSS) sample. The present work demonstrates that incorporation of organic–inorganic nanophase is an effective way to improve the performance of BTS.