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- W2890399757 abstract "The realization of n-type Ge chalcogenides is elusive owing to intrinsic Ge vacancies that make them p-type semiconductors. GeSe crystallizes into a layered orthorhombic structure similar to SnSe at ambient conditions. The high-symmetry cubic phase of GeSe is predicted to be stabilized by applying 7 GPa external pressure or by enhancing the entropy by increasing to temperature to 920 K. Stabilization of the n-type cubic phase of GeSe at ambient conditions was achieved by alloying with AgBiSe2 (30-50 mol %), enhancing the entropy through solid solution mixing. The interplay of positive and negative chemical pressure anomalously changes the band gap of GeSe with increasing the AgBiSe2 concentration. The band gap of n-type cubic (GeSe)1-x (AgBiSe2 )x (0.30≤x≤0.50) has a value in the 0.3-0.4 eV range, which is significantly lower than orthorhombic GeSe (1.1 eV). Cubic (GeSe)1-x (AgBiSe2 )x exhibits an ultralow lattice thermal conductivity (κL ≈0.43 W m-1 K-1 ) in the 300-723 K range. The low κL is attributed to significant phonon scattering by entropy-driven enhanced solid-solution point defects." @default.
- W2890399757 created "2018-09-27" @default.
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- W2890399757 date "2018-11-12" @default.
- W2890399757 modified "2023-10-03" @default.
- W2890399757 title "Stabilizing n‐Type Cubic GeSe by Entropy‐Driven Alloying of AgBiSe <sub>2</sub> : Ultralow Thermal Conductivity and Promising Thermoelectric Performance" @default.
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- W2890399757 doi "https://doi.org/10.1002/anie.201809841" @default.
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