References of "Suprayoga, E."
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See detailA Comparative Study of Thermoelectric Properties of Monolayer, Bilayer and Bulk CrI3
Suprayoga, E; Hanna, M. Y.; Hasdeo, Eddwi Hesky UL et al

in AIP Conference Proceedings (2021), 2382(1), 020004

We comparatively study the electronic and thermoelectric properties of the monolayer, bilayer, and bulk CrI3 by density functional theory (DFT). We show that, according to the DFT calculation, those ... [more ▼]

We comparatively study the electronic and thermoelectric properties of the monolayer, bilayer, and bulk CrI3 by density functional theory (DFT). We show that, according to the DFT calculation, those materials are magnetic semiconductors with ferromagnetic (FM) in monolayer, antiferromagnetic (AFM) in the bilayer, back to FM in the bulk structure. The thermoelectric properties of those materials are evaluated by using the Boltzmann transport equation (BTE) with a constant relaxation time approximation (RTA). At room temperature, we obtain bulk CrI3 has more significant electrical conductivity than monolayer and bilayer CrI3, while the Seebeck coefficient is similar that implied the bulk CrI3 has a better thermoelectric performance. In those systems, the optimum power factor is obtained by shifting the chemical potential of CrI3 by 1 eV with p-type doping. [less ▲]

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See detailInvestigation of electron and phonon transport in Bi-doped CaMnO3 for thermoelectric applications
Suprayoga, E; Putri, WBK; Singsoog, K et al

in Materials Research Bulletin (2021), 141

The electron and phonon transports in CaMnO3 and in one of its Bi-doped counterparts, namely, Bi0.03Ca0.97MnO3, are investigated using the thermoelectric transport measurements and first-principles ... [more ▼]

The electron and phonon transports in CaMnO3 and in one of its Bi-doped counterparts, namely, Bi0.03Ca0.97MnO3, are investigated using the thermoelectric transport measurements and first-principles calculations. We find that antiferromagnetic insulator CaMnO3 breaks the Wiedemann–Franz law with the Lorenz number reaching four times that of ordinary metals at room temperature. Bismuth doping reduces both the electrical resistivity and Seebeck coefficient of CaMnO3; thus, it recovers the Wiedemann–Franz law behavior. In addition, Bi0.03Ca0.97MnO3 possesses a shorter phonon lifetime according to the transport measurements. As a result, Bi0.03Ca0.97MnO3 exhibits superior thermoelectric properties over pristine CaMnO3 owing to the lower thermal conductivity and electrical resistivity. [less ▲]

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See detailThermoelectric properties of two-dimensional hydrogenated borophene: A first-principles study
Hanna, M.Y.; Hasdeo, Eddwi Hesky UL; Suprayoga, E. et al

in AIP Conference Proceedings (2020), 2256(1), 030017

We theoretically study electronic and thermoelectric properties of two-dimensional hydrogenated borophene (”boro-phane”). We show that, according to the first-principles calculation, hydrogenated ... [more ▼]

We theoretically study electronic and thermoelectric properties of two-dimensional hydrogenated borophene (”boro-phane”). We show that, according to the first-principles calculation, hydrogenated borophene is semimetallic, with two bands meeting at a single point at the Fermi level. The thermoelectric properties evaluated by using the Boltzmann equation with a constant relaxation time approximation (CRTA). At room temperature, we obtain large power factor for electron doping regime. Therefore, appropriate doping to this material can enhance its thermoelectric efficiency. [less ▲]

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See detailAb-initio calculation of muon spin polarization function to study lithium-ion diffusion in LiTi2O4 battery material
Suprayoga, E.; Rifai, A.; Subhan, A. et al

in AIP Conference Proceedings (2020), 2256(1), 030015

We report the study of lithium-ion diffusion in LiTi2O4 battery material by the analysis of muon spin polarization function at the muon site by DFT calculation. The important parameters which explain the ... [more ▼]

We report the study of lithium-ion diffusion in LiTi2O4 battery material by the analysis of muon spin polarization function at the muon site by DFT calculation. The important parameters which explain the lithium-ion diffusion will be derived from the function, including the field fluctuation rate and the local field distribution. The calculated results are shown in good agreement with the previously measured field distribution and the field fluctuation rate in LiTi2O4 at the ground state temperature. This method, therefore, may apply to the study of other battery materials. [less ▲]

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See detailThermoelectric properties of Mexican-hat band structures
Nurhuda, M; Nugraha, ART; Hanna, MY et al

in Advances in Natural Sciences: Nanoscience and Nanotechnology (2020), 11(1), 015012

Materials with Mexican-hat electronic energy dispersions emerging from heterostructures, substrate effects, or spin–orbit couplings are believed to exhibit excellent thermoelectric properties due to its ... [more ▼]

Materials with Mexican-hat electronic energy dispersions emerging from heterostructures, substrate effects, or spin–orbit couplings are believed to exhibit excellent thermoelectric properties due to its van Hove singularity of density of states in two-dimension. However, within a constant relaxation time approximation, we disprove this belief and we find that the singularity effect is cancelled down by the group velocity contribution in the thermoelectric transport distribution. Nevertheless, the band parameters can still be optimised to reach thermoelectric figure of merit larger than 2 in a wide bandwidth, thus keeping the potential of materials with Mexican-hat bands for thermoelectric applications. [less ▲]

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See detailThermoelectric properties of Mexican-hat band structures
Nurhuda, M; Nugraha, ART; Hanna, MY et al

in Advances in Natural Sciences: Nanoscience and Nanotechnology (2020), 11(1), 015012

Materials with Mexican-hat electronic energy dispersions emerging from heterostructures, substrate effects, or spin–orbit couplings are believed to exhibit excellent thermoelectric properties due to its ... [more ▼]

Materials with Mexican-hat electronic energy dispersions emerging from heterostructures, substrate effects, or spin–orbit couplings are believed to exhibit excellent thermoelectric properties due to its van Hove singularity of density of states in two-dimension. However, within a constant relaxation time approximation, we disprove this belief and we find that the singularity effect is cancelled down by the group velocity contribution in the thermoelectric transport distribution. Nevertheless, the band parameters can still be optimised to reach thermoelectric figure of merit larger than 2 in a wide bandwidth, thus keeping the potential of materials with Mexican-hat bands for thermoelectric applications. [less ▲]

Detailed reference viewed: 33 (0 UL)