AI Article Synopsis
- The study examines how temperature affects the thermal conductivity of both single and polycrystalline organometallic perovskite CH3NH3PbI3.
- It finds that grain boundaries have little impact on heat transport, as both sample types show similar thermal properties.
- The research highlights that resonant scattering and the interaction between phonon waves and the movements of the CH3NH3(+) sublattice are crucial for the material's very low thermal conductivity.
Article Abstract
We report on the temperature dependence of thermal conductivity of single crystalline and polycrystalline organometallic perovskite CH3NH3PbI3. The comparable absolute values and temperature dependence of the two samples' morphologies indicate the minor role of the grain boundaries on the heat transport. Theoretical modeling demonstrates the importance of the resonant scattering in both specimens. The interaction between phonon waves and rotational degrees of freedom of CH3NH3(+) sublattice emerges as the dominant mechanism for attenuation of heat transport and for ultralow thermal conductivity of 0.5 W/(Km) at room temperature.
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| http://dx.doi.org/10.1021/jz5012109 | DOI Listing |
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