Fig. 1: Thermal transport behaviors of entropy-engineered thin films, and the extrinsic and intrinsic origins of strong phonon scattering after entropy increase.
From: Carrier-phonon decoupling in perovskite thermoelectrics via entropy engineering
a Temperature-dependent total thermal conductivity (κ) of entropy-engineered perovskite oxide thin films. b Calculated lattice thermal conductivity (κL) of entropy-engineered thin films and amorphous limit thermal conductivity of SBCPLTO. c The relation between phonon mean free path (lp) and the size disorder parameter (δ) (Supplementary Table 4)43,99 at A sites. The phonon mean free path was measured on corresponding bulks at room temperature for reference (Supplementary Table 7). The definition of size disorder parameter δ can be found in supplementary materials (Supplementary Equation 1). The purple arrow is a guide for the eyes. d, e The DFT calculation of phonon dispersion of SLTO (d) and SBCPLTO (e). f Raman spectra of corresponding entropy-engineered bulks for reference. g–l The TEM, FFT, and GPA results of SLTO (g, h, i) and SBCPLTO (j, k, l). The dashed lines mark the interfaces between the films and substrates. The dislocation symbols are also shown in red.
