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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THERMAL TRANSPORT BEHAVIORS IN LEAD HALIDE PEROVSKITES

Get access (open in a dialog) DOI: 10.1615/IHTC16.nmt.023055
pages 6985-6992

Résumé

Lead halide perovskites are a leading candidate for next generation solar cells. Its exceptional solar conversion efficiency arises from its favorable but complex transport properties and rivals those of incumbent solar technology. Investigations into its thermal transport properties have only recently gained traction. Using nanoindentation and the frequency domain thermoreflectance technique, the Young's modulus, sound speed, and thermal conductivity of two series of lead halide perovskites are determined - i.e., APbBr3 [A = methylammonium (MA), formamidinium (FA), Cs] and MAPbX3 (X = I, Br, Cl. Their room temperature thermal conductivity trends with their respective sound speed while the average mean free path of phonons in these perovskites are determined to be similar. These results suggest that the difference in sound speed, rather than scattering time, is more important for heat transfer in these materials at room temperature. Preliminary results show that each crystal phase in these perovskites exhibits a different temperature thermal conductivity trend. This crystal phase dependent thermal conductivity trend is uncommon and can shed light into improving the efficiency and stability of the lead halide perovskite solar cells.