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Photodoping through local charge carrier accumulation in alloyed hybrid perovskites for highly efficient luminescence
- Source :
- Nature Photonics
-
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. Localized photodoping in mixed-cation perovskites is shown to modify charge-carrier recombination and thus offer a route for more efficient light emission.
- Subjects :
- Materials science
Band gap
business.industry
02 engineering and technology
sub-03
Nanosecond
021001 nanoscience & nanotechnology
01 natural sciences
7. Clean energy
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
010309 optics
Semiconductor
0103 physical sciences
49 Mathematical Sciences
Optoelectronics
Light emission
Charge carrier
0210 nano-technology
Luminescence
business
Spectroscopy
51 Physical Sciences
Diode
Subjects
Details
- Language :
- English
- ISSN :
- 17494893 and 17494885
- Volume :
- 14
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Nature Photonics
- Accession number :
- edsair.doi.dedup.....f05c9a35e58feebdba8bb22cebcfab57
- Full Text :
- https://doi.org/10.1038/s41566-019-0546-8