Flexible power generators by Ag2Se thin films with record-high thermoelectric performance - Archive ouverte HAL
Article Dans Une Revue Nature Communications Année : 2024

Flexible power generators by Ag2Se thin films with record-high thermoelectric performance

Dong Yang
Meng Li
Mohammad Nisar
Shuo Chen
Yuexing Chen
Fu Li
Hongli Ma
Guangxing Liang
Xianghua Zhang
W Liu
Ping Fan
Zhuang-Hao Zheng

Résumé

Exploring new near-room-temperature thermoelectric materials is significant for replacing current high-cost Bi2Te3. This study highlights the potential of Ag2Se for wearable thermoelectric electronics, addressing the trade-off between performance and flexibility. A record-high ZT of 1.27 at 363 K is achieved in Ag2Se-based thin films with 3.2 at.% Te doping on Se sites, realized by a new concept of doping-induced orientation engineering. We reveal that Te-doping enhances film uniformity and (00l)-orientation and in turn carrier mobility by reducing the (00l) formation energy, confirmed by solid computational and experimental evidence. The doping simultaneously widens the bandgap, resulting in improved Seebeck coefficients and high power factors, and introduces TeSe point defects to effectively reduce the lattice thermal conductivity. A protective organic-polymer-based composite layer enhances film flexibility, and a rationally designed flexible thermoelectric device achieves an output power density of 1.5 mW cm−2 for wearable power generation under a 20 K temperature difference.
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Dates et versions

hal-04479177 , version 1 (27-02-2024)

Identifiants

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Dong Yang, Xiao‐lei Shi, Meng Li, Mohammad Nisar, Adil Mansoor, et al.. Flexible power generators by Ag2Se thin films with record-high thermoelectric performance. Nature Communications, 2024, Nature Communications, 15 (1), pp.923. ⟨10.1038/s41467-024-45092-7⟩. ⟨hal-04479177⟩
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