23 citations · 46 across the 3 of their papers we have counts for
6 papers · 1 filter
Off-centered Pb interstitials in PbTe
Sungjin Park, Jongho Park, Byungki Ryu +1
In this work, we calculate the defect properties of low-symmetry Pb interstitials in PbTe using first-principles density-functional theory calculations. We break the symmetry impos…
Native point defects and low -doping efficiency in solid solutions: A hybrid-density functional study
Byungki Ryu, Eun-Ae Choi, Sungjin Park +5
We perform hybrid-density functional calculations to investigate the charged defect formation energy of native point defects in , , and their solid solutions. The…
General Efficiency Theory of Thermoelectric Conversion
Byungki Ryu, Jaywan Chung, SuDong Park
In this Letter, we show thermoelectric conversion efficiency is \emph{exactly} determined by \emph{three} independent material parameters , , and . Each paramete…
Hybrid-functional and quasi-particle calculations of band structures of Mg2Si, Mg2Ge, and Mg2Sn
Byungki Ryu, Sungjin Park, Eun-Ae Choi +4
We perform hybrid functional and quasi-particle band structure calculations with spin-orbit interaction to investigate the band structures of Mg2Si, Mg2Ge, and Mg2Sn. For all Mg2X…
Investigation of effective thermoelectric properties of composite with interfacial resistance using micromechanics-based homogenisation
Jiyoung Jung, Sangryun Lee, Byungki Ryu +1
We obtained the analytical expression for the effective thermoelectric properties and dimensionless figure of merit of a composite with interfacial electrical and thermal resistanc…
Defects responsible for abnormal n-type conductivity in Ag-excess doped PbTe thermoelectrics
Byungki Ryu, Min-Wook Oh, Jae Ki Lee +6
We find that Ag-interstitial () acts as an electron donor and plays an important role in Ag-excess doped polycrystalline PbTe thermoelectric materials. When Ag is heavily dop…