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- Title
Optimized Thermoelectric Performance and Plasticity of Ductile Semiconductor Ag<sub>2</sub>S<sub>0.5</sub>Se<sub>0.5</sub> Via Dual‐Phase Engineering.
- Authors
Wu, Hao; Shi, Xiao‐Lei; Mao, Yuanqing; Li, Meng; Liu, Wei‐Di; Wang, De‐Zhuang; Yin, Liang‐Cao; Zhu, Min; Wang, Yifeng; Duan, Jingui; Liu, Qingfeng; Chen, Zhi‐Gang
- Abstract
Inorganic semiconductor Ag2S with excellent plasticity is highly desired in flexible and wearable thermoelectrics. However, the compromise between plasticity and thermoelectric performance limits the advances in Ag2S‐based thermoelectric materials and their devices. Here, a 0.5 mol.% Ag2Te‐alloyed Ag2S0.5Se0.5 bulk material is designed, which has a competitively high near‐room‐temperature figure of merit of ≈0.43 at 323 K and an ultra‐high bending strain of ≈32.5% without cracks. Introducing Ag2Te can optimize the carrier concentration and mobility of the Ag2S0.5Se0.5 matrix due to its metal‐like conducting features, leading to a maximum power factor of ≈6 µW cm−1 K−2. Simultaneously, Ag2Te induces Ag‐poor amorphous phase boundaries, serving as buffer layers to enhance the overall plasticity. Moreover, such amorphous phase boundaries combined with multiscale phonon scattering sources can significantly suppress the lattice thermal conductivity to ≈0.28 W m−1 K−1 at 323 K, leading to a high figure of merit. This study demonstrates an innovative route to simultaneously boost the thermoelectric performance and plasticity of ductile semiconductors.
- Subjects
SEMICONDUCTORS; THERMOELECTRIC apparatus &; appliances; CARRIER density; PHONON scattering; BUFFER layers; THERMOELECTRIC materials
- Publication
Advanced Energy Materials, 2023, Vol 13, Issue 43, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.202302551