TY  - JOUR
AU  - Mao, Fengting
AU  - Zhang, Zhongwei
AU  - Zhu, Sijing
AU  - Liu, Chengyan
AU  - Gao, Jie
AU  - Chen, Jun-Liang
AU  - Wang, Xiaoyang
AU  - Xing, Tong
AU  - Miao, Lei
PY  - 2026
TI  - A core-shell structure to realize high thermoelectric performance in Fe and Sb co-doped GeTe materials
JO  - Journal of Materiomics
SN  - 2352-8478
VL  - 12
IS  - 1
AB  - GeTe is a promising medium-temperature thermoelectric material. However, an excessively high concentration of Ge holes leads to a high hole carrier concentration, which can degrade its performance. Though carrier concentration reduction via doping has been pursued as a principal optimization approach, the strong interdependence between key transport parameters and carrier concentration severely limited the overall enhancement efficacy. In this work, a simple composite method is employed to achieve synergistic optimization of carrier concentration and carrier mobility, thereby increasing the power factor and reducing the lattice thermal conductivity. Sb and Fe form a core-shell structure, which effectively scatters phonons and reduces the lattice thermal conductivity, achieving a minimum value of 0.59 W·m−1·K−1 at 723 K. Additionally, Fe doping enhances the effective mass, improves the Seebeck coefficient, and significantly boosts the power factor, which reaches a peak value of 43.0 μW·cm−1·K−2 at 623 K. The results demonstrate that the sample Ge0.885Sb0.1Fe0.015Te achieves a maximum zT of approximately 2.13 at 723 K and an average zT (zTavg) of 1.43 within the temperature range of 323 K–773 K. This work provides an effective path to enhance the performance of GeTe-based thermoelectric materials.
UR  - https://doi.org/10.1016/j.jmat.2025.101108
DO  - 10.1016/j.jmat.2025.101108