Local Versus Long-Range Diffusion Effects of Photoexcited States on Radiative Recombination in Organic-Inorganic Lead Halide Perovskites.


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Authors
Vrućinić, Milan 
Matthiesen, Clemens 
Cacovich, Stefania 
Abstract

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.

Description
Keywords
excited state diffusion, hybrid lead halide perovskite, photoluminescence, scanning near‐field microscopy
Journal Title
Adv Sci (Weinh)
Conference Name
Journal ISSN
2198-3844
2198-3844
Volume Title
2
Publisher
Wiley
Sponsorship
Engineering and Physical Sciences Research Council (EP/H040218/1)
Engineering and Physical Sciences Research Council (EP/M005143/1)
EPSRC (via Brunel University London) (unknown)
Engineering and Physical Sciences Research Council (EP/G060738/1)
European Research Council (259619)
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.