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10 March 2020 Exploiting localized charge accumulation regions in alloyed hybrid perovskites for highly efficient luminescence (Conference Presentation)
Sascha Feldmann, Stuart Macpherson, Satyaprasad P. Senanayak, Mojtaba Abdi-Jalebi, Jasmine P. H. Rivett, Guangjun Nan, Gregory D Tainter, Tiarnan A. S. Doherty, Kyle Frohna, Emilie Ringe, Richard H. Friend, Henning Sirringhaus, Michael Saliba, David Beljonne, Samuel D. Stranks, Felix Deschler
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Proceedings Volume 11275, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX; 112750D (2020) https://doi.org/10.1117/12.2543694
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
Hybrid perovskites have emerged as exceptional semiconductors for optoelectronic applications. Here, we control the cation alloying to push 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 photo-excited 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 and elemental composition, 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 photo-doped regions, which unearths a strategy for efficient light emission at low charge-injection in solar cells and LEDs.
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Sascha Feldmann, Stuart Macpherson, Satyaprasad P. Senanayak, Mojtaba Abdi-Jalebi, Jasmine P. H. Rivett, Guangjun Nan, Gregory D Tainter, Tiarnan A. S. Doherty, Kyle Frohna, Emilie Ringe, Richard H. Friend, Henning Sirringhaus, Michael Saliba, David Beljonne, Samuel D. Stranks, and Felix Deschler "Exploiting localized charge accumulation regions in alloyed hybrid perovskites for highly efficient luminescence (Conference Presentation)", Proc. SPIE 11275, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX, 112750D (10 March 2020); https://doi.org/10.1117/12.2543694
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KEYWORDS
Perovskite
Luminescence
Optoelectronics
Carrier dynamics
Light emitting diodes
Semiconductors
Solar cells
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