Pressure Impact on Lattice Thermal Conductivity and Its Related Parameters in CdSe Bulk, Nanowires, and Thin Film

Abstract

The hydrostatic pressure effect on lattice thermal conductivity (LTC) in CdSe bulk, nanowires, and thin films was calculated. Values of LTC obtained through Callaway with that of Clapeyron equations are used to correlate those of the experimentally measured curves. Frequency-dependent relaxation time approximation of phonon-scattering processes was considered, which scattering due to boundary, imperfections, dislocations, electron, and other phonons via Umklapp and normal processes were used and clarified their effects. The impact of pressure on LTC is clarified according to both sample boundary dislocation concentrations. The influence of pressure is described, along with how the size dependence of the melting temperature, Debye temperature, and phonon group velocity of CdSe nanocrystals is affected. These parameters decrease as pressure increases.