Figure 3.

Characterization of thermal transport in MHHPs. a) The thermal conductivity of MHHPs from experimental measurements (red line, in which the pink shadow area is the standard errors of FDTR measured results), molecular dynamics simulation (blue dot), and references (black dot).^{[ 18 ]} b) The spectral thermal conductivity contributed by atomic vibrations in MAPbI₃, MAPb(Br_0.5I_0.5)₃, and MAPbBr₃ under finite lengths. c) The accumulative thermal conductivity of MHHPs. d) The decomposed contribution from atomic vibrations and confined diffusion of MA⁺ to total thermal conductivity.