Temperature-dependent thermal conductivity trend of MAPbBr3 as measured by the frequency-domain thermoreflectance method
Thermal management is critical for the performance of solar cells,especially true for the light-absorbing layer.Methylammonium lead bromide perovskite(MAPbBr3)is a promising material for solar cells due to its low fabrication cost and high light absorption coefficient.However,few studies were reported on its thermal transport properties.In this paper,the temperature-dependent thermal conductivity of MAPbBr3 perovskite single crystal and thin films was studied.The thermal conductivity of MAPbBr3single crystal decreases with increasing temperature in its orthorhombic and cubic phases.However,the thermal conductivity of its tetragonal phase with increasing temperature exhibits an unusual"first increase then decrease"trend.For the thin films,the thermal conductivity of a 100-nm-thick MAPbBr3 film at room temperature is roughly 68%of that of a single crystal while the thermal conductivity of a 160-nm-thick thin film is similar to that of a single crystal.The thermal conductivity of MAPbBr3 perovskite thin film presents the typical trend of the temperature-dependent thermal conductivity of amorphous materials.These results will be important to the thermal management of hybrid perovskites in space applications.
thermal conductivityperovskitesingle crystalthin filmlow temperature
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维普
