26 September 2016 Carrier-phonon interactions in hybrid halide perovskites probed with ultrafast anisotropy studies
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Hybrid halide perovskites are at the frontier of optoelectronic research due to their excellent semiconductor properties and solution processability. For this reason, much attention has recently been focused on understanding photoexcited charge-carrier generation and recombination in these materials. Conversely, very few studies have so far been devoted to understanding carrier-carrier and carrier-phonon scattering mechanisms in these materials. This is surprising given that carrier scattering mechanisms fundamentally limit charge-carrier motilities and therefore the performance of photovoltaic devices. We apply linear polarization selective transient absorption measurements to polycrystalline CH3NH3PbBr3 hybrid halide perovskite films as an effective way of studying the scattering processes in these materials. Comparison of the photo induced bleach signals obtained when the linear polarizations of the pump and probe are aligned either parallel or perpendicular to one another, reveal a significant difference in spectral intensity and shape within the first few hundred femtoseconds after photoexcitation.
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Jasmine P. H. Rivett, Jasmine P. H. Rivett, Johannes M. Richter, Johannes M. Richter, Michael B. Price, Michael B. Price, Dan Credgington, Dan Credgington, Felix Deschler, Felix Deschler, } "Carrier-phonon interactions in hybrid halide perovskites probed with ultrafast anisotropy studies", Proc. SPIE 9923, Physical Chemistry of Interfaces and Nanomaterials XV, 99231E (26 September 2016); doi: 10.1117/12.2238906; https://doi.org/10.1117/12.2238906

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