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Proceedings Paper

Exploiting localized charge accumulation regions in alloyed hybrid perovskites for highly efficient luminescence (Conference Presentation)
Author(s): 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

Paper 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.

Paper Details

Date Published: 10 March 2020
Proc. SPIE 11275, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX, 112750D (10 March 2020); doi: 10.1117/12.2543694
Show Author Affiliations
Sascha Feldmann, Univ. of Cambridge (United Kingdom)
Stuart Macpherson, Univ. of Cambridge (United Kingdom)
Satyaprasad P. Senanayak, Univ. of Cambridge (United Kingdom)
Mojtaba Abdi-Jalebi, Univ. of Cambridge (United Kingdom)
Jasmine P. H. Rivett, Univ. of Cambridge (United Kingdom)
Guangjun Nan, Univ. de Mons (Belgium)
Gregory D Tainter, Univ. of Cambridge (United Kingdom)
Tiarnan A. S. Doherty, Univ. of Cambridge (United Kingdom)
Kyle Frohna, Univ. of Cambridge (United Kingdom)
Emilie Ringe, Univ of Cambridge (United Kingdom)
Richard H. Friend, Univ. of Cambridge (United Kingdom)
Henning Sirringhaus, Univ. of Cambridge (United Kingdom)
Michael Saliba, Univ. de Fribourg (Switzerland)
David Beljonne, Univ. de Mons (Belgium)
Samuel D. Stranks, Univ. of Cambridge (United Kingdom)
Felix Deschler, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 11275:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX
Alexandre Freundlich; Masakazu Sugiyama; Stéphane Collin, Editor(s)

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