Photodoping through local charge carrier accumulation in alloyed hybrid perovskites for highly efficient luminescence

Feldmann, Sascha and Macpherson, Stuart and Senanayak, Satyaprasad P. and Abdi-Jalebi, Mojtaba and Rivett, Jasmine P. H. and Nan, Guangjun and Tainter, Gregory D. and Doherty, Tiarnan A. S. and Frohna, Kyle and Ringe, Emilie and Friend, Richard H. and Sirringhaus, Henning and Saliba, Michael and Beljonne, David and Stranks, Samuel D. and Deschler, Felix (2020) Photodoping through local charge carrier accumulation in alloyed hybrid perovskites for highly efficient luminescence. Nature Photonics, 14 (2). pp. 123-128. ISSN 1749-4885 DOI https://doi.org/10.1038/s41566-019-0546-8

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Official URL: https://doi.org/10.1038/s41566-019-0546-8

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.

Item Type: Article
Uncontrolled Keywords: 2019AREP; IA76
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
08 - Green Open Access
Journal or Publication Title: Nature Photonics
Volume: 14
Page Range: pp. 123-128
Identification Number: https://doi.org/10.1038/s41566-019-0546-8
Depositing User: Sarah Humbert
Date Deposited: 27 Jun 2020 00:57
Last Modified: 27 Jun 2020 00:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/4771

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