TY  - JOUR
AU  - Feldmann, Sascha
AU  - Macpherson, Stuart
AU  - Senanayak, Satyaprasad P.
AU  - Abdi-Jalebi, Mojtaba
AU  - Rivett, Jasmine P. H.
AU  - Nan, Guangjun
AU  - Tainter, Gregory D.
AU  - Doherty, Tiarnan A. S.
AU  - Frohna, Kyle
AU  - Ringe, Emilie
AU  - Friend, Richard H.
AU  - Sirringhaus, Henning
AU  - Saliba, Michael
AU  - Beljonne, David
AU  - Stranks, Samuel D.
AU  - Deschler, Felix
TI  - Photodoping through local charge carrier accumulation in alloyed hybrid perovskites for highly efficient luminescence
JO  - Nature photonics
VL  - 14
IS  - 2
SN  - 1749-4893
CY  - London [u.a.]
PB  - Nature Publ. Group
M1  - FZJ-2021-00691
SP  - 123-128
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000511124400013
DO  - DOI:10.1038/s41566-019-0546-8
UR  - https://juser.fz-juelich.de/record/890102
ER  -