Journal Article

FZJ-2021-00691

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Photodoping through local charge carrier accumulation in alloyed hybrid perovskites for highly efficient luminescence

Feldmann, S. ; Macpherson, S. ; Senanayak, S. P. ; Abdi-Jalebi, M. ; Rivett, J. P. H. ; Nan, G. ; Tainter, G. D. ; Doherty, T. A. S. ; Frohna, K. ; Ringe, E. ; Friend, R. H. ; Sirringhaus, H. ; Saliba, M.FZJ* ; Beljonne, D. ; Stranks, S. D. ; Deschler, F. (Corresponding author)

2020
Nature Publ. Group London [u.a.]

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Please use a persistent id in citations: doi:10.1038/s41566-019-0546-8  doi:10.34734/FZJ-2021-00691

Abstract: Metal halide perovskites have emerged as exceptional semiconductors for optoelectronic applications. Substitution of the monovalent cations has advanced luminescence yields and device efficiencies. Here, we control the cation alloying to enhance optoelectronic performance through alteration of the charge carrier dynamics in mixed-halide perovskites. In contrast to single-halide perovskites, we find high luminescence yields for photoexcited carrier densities far below solar illumination conditions. Using time-resolved spectroscopy we show that the charge carrier recombination regime changes from second to first order within the first tens of nanoseconds after excitation. Supported by microscale mapping of the optical bandgap, electrically gated transport measurements and first-principles calculations, we demonstrate that spatially varying energetic disorder in the electronic states causes local charge accumulation, creating p- and n-type photodoped regions, which unearths a strategy for efficient light emission at low charge-injection in solar cells and light-emitting diodes.

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Contributing Institute(s):

1. Photovoltaik (IEK-5)

Research Program(s):

1. 121 - Solar cells of the next generation (POF3-121) (POF3-121)
2. Helmholtz Young Investigators Group (HGF-YoungInvestigatorsGroup) (HGF-YoungInvestigatorsGroup)

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 30 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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