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- W2989273001 abstract "Abstract Chalcopyrite compound CuGaTe 2 is the focus of much research interest due to its high power factor. However, its high intrinsic lattice thermal conductivity seriously impedes the promotion of its thermoelectric performance. Here, it is shown that through alloying of isoelectronic elements In and Ag in CuGaTe 2 , a quinary alloy compound system Cu 1− x Ag x Ga 0.4 In 0.6 Te 2 (0 ≤ x ≤ 0.4) with complex nanosized strain domain structure is prepared. Due to strong phonon scattering mainly by this domain structure, thermal conductivity (at 300 K) drops from 6.1 W m −1 K −1 for the host compound to 1.5 W m −1 K −1 for the sample with x = 0.4. As a result, the optimized chalcopyrite sample Cu 0.7 Ag 0.3 Ga 0.4 In 0.6 Te 2 presents an outstanding performance, with record‐high figure of merit (ZT) reaching 1.64 (at 873 K) and average ZT reaching 0.73 (between ≈300 and 873 K), which are ≈37 and ≈35% larger than the corresponding values for pristine CuGaTe 2 , respectively, demonstrating that such domain structure arising from isoelectronic multielement alloying in chalcopyrite compound can effectively suppress its thermal conductivity and elevate its thermoelectric performance remarkably." @default.
- W2989273001 created "2019-11-22" @default.
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- W2989273001 date "2019-11-12" @default.
- W2989273001 modified "2023-10-16" @default.
- W2989273001 title "Design of Domain Structure and Realization of Ultralow Thermal Conductivity for Record‐High Thermoelectric Performance in Chalcopyrite" @default.
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- W2989273001 doi "https://doi.org/10.1002/adma.201905210" @default.
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