Local Versus Long-Range Diffusion Effects of Photoexcited States on Radiative Recombination in Organic–Inorganic Lead Halide Perovskites
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Vrućinić, M., Matthiesen, C., Sadhanala, A., Divitini, G., Cacovich, S., Dutton, S., Ducati, C., et al. (2015). Local Versus Long-Range Diffusion Effects of Photoexcited States on Radiative Recombination in Organic–Inorganic Lead Halide Perovskites. Advanced Science, 2 (1500136)https://doi.org/10.1002/advs.201500136
Radiative recombination in thin films of the archetypical, high-performing perovskites CH₃NH₃PbBr₃ and CH₃NH₃PbI₃ shows localized regions of increased emission with dimensions ≈ 500 nm. Maps of the spectral emission line shape show narrower emission lines in high emission regions, which can be attributed to increased order. Excited states do not diffuse out of high emission regions before they decay, but are decoupled from nearby regions, either by slow diffusion rates or energetic barriers.
excited state diffusion, hybrid lead halide perovskite, photoluminescence, scanning near-field microscopy
Funding was supported by the Winton Program for the Physics of Sustainability and the EPSRC. M.V. thanks the Winton Programme for the Physics of Sustainability and the Cambridge Trust. C.M. acknowledges funding from a Clare College Junior Research Fellowship. G.D., S.C., and C.D. acknowledge funding from ERC under grant number 259619 PHOTO EM. F.D. acknowledges funding from a Herchel Smith Research Fellowship.
HERIOT-WATT UNIVERSITY (PTNR EPSRC) (EP/H040218/1)
EPSRC (via Brunel University London) (unknown)
European Research Council (259619)
External DOI: https://doi.org/10.1002/advs.201500136
This record's URL: https://www.repository.cam.ac.uk/handle/1810/250411
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Licence URL: http://creativecommons.org/licenses/by/4.0/