@article{Ning2026, 
author = {Xingkun Ning and Yongmao Ran and Jiaying Han and Linjie Gao and Shufang Wang},
title = {Remarkable flexibility and curvature-tunable thermoelectric properties in transparent freestanding single-crystalline CdO membranes},
year = {2026},
journal = {Journal of Materiomics},
volume = {12},
number = {2},
keywords = {Flexibility, Freestanding, CdO, Transparent thermoelectric, Curvature-tunable},
url = {https://www.sciopen.com/article/10.1016/j.jmat.2025.101153},
doi = {10.1016/j.jmat.2025.101153},
abstract = {Transparent thermoelectric CdO thin films exhibit critical flexibility and thermoelectric performance that require focused research to advance flexible transparent self-powered devices. Here, we demonstrate the superior flexibility of freestanding single-crystalline CdO membranes. These membranes achieve a notable room-temperature power factor of 1.48 μW·cm−1·K−2 and exhibit superior optical transmittance exceeding 94% in the 550–800 nm range. Crucially, freestanding CdO exhibits exceptional mechanical robustness, retaining >90% electrical conductivity after 1000 bending cycles (radius: 11.5 mm). Microstructure analyses confirm polycrystalline CdO films suffer from grain boundary cracking under bending due to stress concentration, but single-crystal CdO membranes—without grain boundaries to concentrate stress—exhibit better flexibility and resistance to cracking. Furthermore, curvature-induced strain boosts the power factor by 12.8%, providing a curvature-controlled strain engineering strategy to optimize flexible thermoelectric performance. This work establishes freestanding CdO as a highly efficient and flexible thermoelectric material and suggests a fundamental strategy for designing robust smart materials for transparent, self-powered flexible electronics.}
}