TY - JOUR
N2 - Results of the ab initio molecular dynamics calculations of silicon crystals are presented by means of analysis of the velocity autocorrelation function and determination of mean phonon relaxation time. The mean phonon relaxation time is crucial for prediction of the phonon-associated coefficient of thermal conductivity of materials. A clear correlation between the velocity autocorrelation function relaxation time and the coefficient of thermal diffusivity has been found. The analysis of the results obtained has indicated a decrease of the velocity autocorrelation function relaxation time t with increase of temperature. The method proposed may be used to estimate the coefficient of ther-mal diffusivity and thermal conductivity of the materials based on silicon and of other wide-bandgap semiconductors. The correlation between kinetic energy fluctuations and relaxation time of the velocity autocorrelation function has been calculated with the relatively high coefficient of determination R2 = 0.9396. The correlation obtained and the corresponding approach substantiate the use of kinetic energy fluctuations for the calculation of values related to heat conductivity in silicon-based semiconductors (coefficients of thermal conductivity and diffusivity).
L1 - http://www.czasopisma.pan.pl/Content/113177/PDF/22_651-656_01072_Bpast.No.67-3_06.02.20.pdf
L2 - http://www.czasopisma.pan.pl/Content/113177
PY - 2019
IS - No. 3
EP - 656
DO - 10.24425/bpasts.2019.129663
KW - silicon
KW - molecular dynamics
KW - relaxation time of the velocity autocorrelation function
KW - coefficient of thermal diffusivity
A1 - Andriyevsky, B.
A1 - Maliński, M.
A1 - Buryło, Ł.
A1 - Stadnyk, V.Y.
A1 - Romanyuk, M.O.
A1 - Piekarski, J.
A1 - Andriyevska, L.
VL - 67
DA - 30.06.2019
T1 - Estimation of phonon relaxation time for silicon by means of using the velocity autocorrelation function of atoms in molecular dynamics
SP - 651
UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/113177
T2 - Bulletin of the Polish Academy of Sciences Technical Sciences
ER -