TY - JOUR
T1 - Thermoelectric Nanocomposites and Segmented Single-Leg Device Based on GeTe and (Bi,Sb)2Te3
AU - Emiliano, Lawrence Yongo Methodius
AU - Jiang, Yilin
AU - Zhuang, Hua Lu
AU - Li, Hezhang
AU - Chen, Chen
AU - Zhang, Su Wei
AU - Miyazaki, Yuzuru
AU - Li, Jing Feng
N1 - Publisher Copyright:
© 2026 by the authors.
PY - 2026/4
Y1 - 2026/4
N2 - Thermoelectric (TE) materials offer a promising route for direct thermal-to-electrical energy conversion via the Seebeck effect. Among them, GeTe exhibits superior performance in the mid-temperature range (500–800 K), whereas (Bi,Sb)2Te3 is widely regarded as the benchmark material for near low-temperature applications (< 450 K). To improve TE efficiency over a wider temperature range, segmented GeTe/(Bi,Sb)2Te3-based single-leg TE devices were developed. Specifically, based on nanocomposite technology, B4C and SiC nanoparticles were, respectively, introduced into GeTe and (Bi,Sb)2Te3, achieving optimization of electrical conductivity alongside reduction in thermal conductivity, thereby enhancing the thermoelectric figure of merit (ZT). Finite element simulations were used to optimize the geometric structure of the segmented device, determining the ideal ratio of GeTe to (Bi,Sb)2Te3. The simulations predicted a maximum conversion efficiency (ηmax) of 16.9% when the ratio of GeTe to (Bi,Sb)2Te3 was 0.24, with a power density of 18.5 mW/mm2. Experimentally, the fabricated segmented device attained a peak conversion efficiency of 7.14% and a power density of 12.5 mW/mm2 under a hot-side temperature of 773 K. These findings confirm that strategic segmentation, combined with nanoscale phonon scattering engineering, substantially improves overall TE device performance across broad temperature range, underscoring its potential for high-efficiency thermoelectric energy conversion systems.
AB - Thermoelectric (TE) materials offer a promising route for direct thermal-to-electrical energy conversion via the Seebeck effect. Among them, GeTe exhibits superior performance in the mid-temperature range (500–800 K), whereas (Bi,Sb)2Te3 is widely regarded as the benchmark material for near low-temperature applications (< 450 K). To improve TE efficiency over a wider temperature range, segmented GeTe/(Bi,Sb)2Te3-based single-leg TE devices were developed. Specifically, based on nanocomposite technology, B4C and SiC nanoparticles were, respectively, introduced into GeTe and (Bi,Sb)2Te3, achieving optimization of electrical conductivity alongside reduction in thermal conductivity, thereby enhancing the thermoelectric figure of merit (ZT). Finite element simulations were used to optimize the geometric structure of the segmented device, determining the ideal ratio of GeTe to (Bi,Sb)2Te3. The simulations predicted a maximum conversion efficiency (ηmax) of 16.9% when the ratio of GeTe to (Bi,Sb)2Te3 was 0.24, with a power density of 18.5 mW/mm2. Experimentally, the fabricated segmented device attained a peak conversion efficiency of 7.14% and a power density of 12.5 mW/mm2 under a hot-side temperature of 773 K. These findings confirm that strategic segmentation, combined with nanoscale phonon scattering engineering, substantially improves overall TE device performance across broad temperature range, underscoring its potential for high-efficiency thermoelectric energy conversion systems.
KW - (Bi,Sb)Te
KW - GeTe
KW - conversion efficiency
KW - nanocomposites
KW - segmented device
KW - thermoelectric
UR - https://www.scopus.com/pages/publications/105035651918
U2 - 10.3390/ma19071345
DO - 10.3390/ma19071345
M3 - Article
AN - SCOPUS:105035651918
SN - 1996-1944
VL - 19
JO - Materials
JF - Materials
IS - 7
M1 - 1345
ER -