@article{Mao2026, 
author = {Fengting Mao and Zhongwei Zhang and Sijing Zhu and Chengyan Liu and Jie Gao and Jun-Liang Chen and Xiaoyang Wang and Tong Xing and Lei Miao},
title = {A core-shell structure to realize high thermoelectric performance in Fe and Sb co-doped GeTe materials},
year = {2026},
journal = {Journal of Materiomics},
volume = {12},
number = {1},
keywords = {GeTe thermoelectrics, FeGe2 second phase, Core-shell structure, Phonon scattering},
url = {https://www.sciopen.com/article/10.1016/j.jmat.2025.101108},
doi = {10.1016/j.jmat.2025.101108},
abstract = {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.}
}