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Diammonium and Monoammonium Mixed‐Organic‐Cation Perovskites for High Performance Solar Cells with Improved Stability

Diammonium and Monoammonium Mixed‐Organic‐Cation Perovskites for High Performance Solar Cells... Remarkable power conversion efficiencies (PCE) of metal–halide perovskite solar cells (PSCs) are overshadowed by concerns about their ultimate stability, which is arguably the prime obstacle to commercialization of this promising technology. Herein, the problem is addressed by introducing ethane‐1,2‐diammonium (+NH3(CH2)2NH3+, EDA2+) cations into the methyl ammonium (CH3NH3+, MA+) lead iodide perovskite, which enables, inter alia, systematic tuning of the morphology, electronic structure, light absorption, and photoluminescence properties of the perovskite films. Incorporation of <5 mol% EDA2+ induces strain in the perovskite crystal structure with no new phase formed. With 0.8 mol% EDA2+, PCE of the MAPbI3‐based PSCs (aperture of 0.16 cm2) improves from 16.7% ± 0.6% to 17.9% ± 0.4% under 1 sun irradiation, and fabrication of larger area devices (aperture 1.04 cm2) with a certified PCE of 15.2% ± 0.5% is demonstrated. Most importantly, EDA2+/MA+‐based solar cells retain 75% of the initial performance after 72 h of continuous operation at 50% relative humidity and 50 °C under 1 sun illumination, whereas the MAPbI3 devices degrade by approximately 90% within only 15 h. This substantial improvement in stability is attributed to the steric and coulombic interactions of embedded EDA2+ in the perovskite structure. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

Diammonium and Monoammonium Mixed‐Organic‐Cation Perovskites for High Performance Solar Cells with Improved Stability

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Publisher
Wiley
Copyright
© 2017 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.201700444
Publisher site
See Article on Publisher Site

Abstract

Remarkable power conversion efficiencies (PCE) of metal–halide perovskite solar cells (PSCs) are overshadowed by concerns about their ultimate stability, which is arguably the prime obstacle to commercialization of this promising technology. Herein, the problem is addressed by introducing ethane‐1,2‐diammonium (+NH3(CH2)2NH3+, EDA2+) cations into the methyl ammonium (CH3NH3+, MA+) lead iodide perovskite, which enables, inter alia, systematic tuning of the morphology, electronic structure, light absorption, and photoluminescence properties of the perovskite films. Incorporation of <5 mol% EDA2+ induces strain in the perovskite crystal structure with no new phase formed. With 0.8 mol% EDA2+, PCE of the MAPbI3‐based PSCs (aperture of 0.16 cm2) improves from 16.7% ± 0.6% to 17.9% ± 0.4% under 1 sun irradiation, and fabrication of larger area devices (aperture 1.04 cm2) with a certified PCE of 15.2% ± 0.5% is demonstrated. Most importantly, EDA2+/MA+‐based solar cells retain 75% of the initial performance after 72 h of continuous operation at 50% relative humidity and 50 °C under 1 sun illumination, whereas the MAPbI3 devices degrade by approximately 90% within only 15 h. This substantial improvement in stability is attributed to the steric and coulombic interactions of embedded EDA2+ in the perovskite structure.

Journal

Advanced Energy MaterialsWiley

Published: Sep 1, 2017

Keywords: ; ; ; ;

References