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- W3201974175 endingPage "110931" @default.
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- W3201974175 abstract "A systematic investigation on the thermoelectric performance of newly predicted two-dimensional (2D) semiconducting SiS 2 and SiSe 2 monolayers has been carried out using density functional theory (DFT) based calculations and solving the Boltzmann transport equations (BTEs) for electrons and phonons. The electronic band structures and transport coefficients are calculated employing the Hybrid functional (HSE06) as exchange-correlation functional. High power factor (PF) and low value of lattice thermal conductivity ( k ph ) leads to a high thermoelectric figure of merit (zT) in monolayer SiS 2 and SiSe 2. Our theoretical investigation suggests that newly predicted semiconducting SiSe 2 and SiS 2 monolayers can be very promising thermoelectric materials. For high-efficiency thermoelectric power conversion, not only improvement of existing materials properties but also prediction and synthesis of new thermoelectric materials are needed. Here, we have carried out a systematic investigation on the thermoelectric performance of newly predicted two dimensional (2D) semiconducting SiS 2 and SiSe 2 monolayers using density functional theory (DFT) and solving the Boltzmann transport equations (BTEs) for electrons and phonons. Our computed value of lattice thermal conductivity ( k ph ) in SiSe 2 monolayer is ultralow, which results in a high thermoelectric figure of merit (zT) value of 0.86 (0.83) for p-type (n-type) at 900 K in SiSe 2 monolayer. While in SiS 2 monolayer, zT value are 0.77 (p-type) and 0.71 (n-type) at 900 K. The values of k ph are attributed to low group velocity, strong anharmonicity and phonon–phonon coupling of acoustic and low-frequency optical branches, leading to larger scattering, smaller mean free path, and shorter lifetime of phonons. It is also found that p-type doping is more effective than n-type doping to get optimal power factor (PF) and zT. Our findings suggest that newly predicted semiconducting SiSe 2 and SiS 2 monolayers can be very promising thermoelectric materials for the fabrication of high-efficiency thermoelectric power generators to convert waste heat into electricity." @default.
- W3201974175 created "2021-10-11" @default.
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- W3201974175 date "2022-01-01" @default.
- W3201974175 modified "2023-10-17" @default.
- W3201974175 title "Low lattice thermal conductivity and its role in the remarkable thermoelectric performance of newly predicted SiS2 and SiSe2 monolayers" @default.
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- W3201974175 doi "https://doi.org/10.1016/j.commatsci.2021.110931" @default.
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