High Thermoelectric Power Factors in Plastic/Ductile Bulk SnSe2‐Based Crystals

The recently discovered plastic/ductile inorganic thermoelectric (TE) materials open a new avenue for the fabrication of high‐efficiently flexible TE devices, which can utilize the small temperature difference between human body and environment to generate electricity. However, the maximum power fac...

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Vydáno v:Advanced materials (Weinheim) Ročník 36; číslo 5; s. e2304219 - n/a
Hlavní autoři: Deng, Tingting, Gao, Zhiqiang, Qiu, Pengfei, Zhou, Zhengyang, Ming, Chen, Liu, Zhiping, Li, Zhi, Yang, Shiqi, Wei, Tian‐Ran, Wang, Genshui, Chen, Lidong, Shi, Xun
Médium: Journal Article
Jazyk:angličtina
Vydáno: Weinheim Wiley Subscription Services, Inc 01.02.2024
Témata:
2D materials
Carrier density
Crystals
Electricity distribution
Maximum power density
plasticity/ductility
Power factor
SnSe2
Temperature gradients
thermoelectric
Thermoelectric materials
ISSN:0935-9648, 1521-4095, 1521-4095
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Shrnutí:The recently discovered plastic/ductile inorganic thermoelectric (TE) materials open a new avenue for the fabrication of high‐efficiently flexible TE devices, which can utilize the small temperature difference between human body and environment to generate electricity. However, the maximum power factor (PF) of current plastic/ductile TE materials is usually around or less than 10 µW cm−1 K−2, much lower than the classic brittle TE materials. In this work, a record‐high PF of 18.0 µW cm−1 K−2 at 375 K in plastic/ductile bulk SnSe2‐based crystals is reported, superior to all the plastic inorganic TE materials and flexible organic TE materials reported before. The origin of such high PF is from the modulation of material's stacking forms and polymorph crystal structures via simultaneously doping Cl/Br at Se‐site and intercalating Cu inside the van der Waals gap, leading to the significantly enhanced carrier concentrations and mobilities. An in‐plane fully flexible TE device made of the plastic/ductile SnSe2‐based crystals is successfully developed to show a record‐high normalized maximum power density to 0.18 W m−1 under a temperature difference of 30 K. This work indicates that the plastic/ductile material can realize high TE power factor to achieve large output electric power density in flexible TE technology. In this work, a power factor of 18.0 µW cm−1 K−2 in plastic/ductile bulk SnSe2‐based crystals is reported. The origin of such high power factor is from the modulation of material's stacking forms and polymorph crystal structures via simultaneously doping Cl/Br at Se‐site and intercalating Cu inside the van der Waals gap, which significantly enhances the carrier concentration and mobility.
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ISSN:0935-9648
1521-4095
1521-4095
DOI:10.1002/adma.202304219