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Polymorphic Interface engineering for high-performance Ag2Se-based flexible thermoelectric device
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DOI：10.1016/j.jcis.2025.138307.png)
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Abstract
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Flexible thermoelectric materials hold significant importance for various applications, especially as power generators or active coolers in portable devices. Ag2Se is a promising near-room-temperature thermoelectric material characterized by high carrier mobility and low lattice thermal conductivity. However, its high carrier concentration and limited flexibility restrict its further application. Herein, we proposed a strategy of polymorphic interface engineering in Ag-Ag2Se-graphene (0D-1D-2D) ternary composites. The co-existence of Ag nanoparticles-Ag2Se nanowires modulated the high carrier concentration, while the Ag2Se nanowires-graphene interfaces further enhanced both thermoelectric performance and flexibility. Ultimately, an improved power factor of 1643 μW m−1 K−2 was achieved in 0.25 wt% graphene -Ag2.25Se composite films with good flexibility. Furthermore, a flexible 3-leg thermoelectric generator assembled from these films delivers maximum output power of ∼1.5 μW under a temperature gradient of 50 K. This work presents an effective strategy for constructing polymorphic interfaces of high-performance flexible thermoelectric composite films based on inorganic/carbon nanomaterials.
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9.7
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3.7W
Citations:
14.7W
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