Lookup NU author(s): Dr Pablo Docampo
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Wiley-VCH Verlag, 2018.
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© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim State-of-the-art perovskite-based solar cells employ expensive, organic hole transporting materials (HTMs) such as Spiro-OMeTAD that, in turn, limits the commercialization of this promising technology. Herein an HTM (EDOT-Amide-TPA) is reported in which a functional amide-based backbone is introduced, which allows this material to be synthesized in a simple condensation reaction with an estimated cost of <$5 g−1. When employed in perovskite solar cells, EDOT-Amide-TPA demonstrates stabilized power conversion efficiencies up to 20.0% and reproducibly outperforms Spiro-OMeTAD in direct comparisons. Time resolved microwave conductivity measurements indicate that the observed improvement originates from a faster hole injection rate from the perovskite to EDOT-Amide-TPA. Additionally, the devices exhibit an improved lifetime, which is assigned to the coordination of the amide bond to the Li-additive, offering a novel strategy to hamper the migration of additives. It is shown that, despite the lack of a conjugated backbone, the amide-based HTM can outperform state-of-the-art HTMs at a fraction of the cost, thereby providing a novel set of design strategies to develop new, low-cost HTMs.
Author(s): Petrus ML, Schutt K, Sirtl MT, Hutter EM, Closs AC, Ball JM, Bijleveld JC, Petrozza A, Bein T, Dingemans TJ, Savenije TJ, Snaith H, Docampo P
Publication type: Article
Publication status: Published
Journal: Advanced Energy Materials
Print publication date: 15/11/2018
Online publication date: 08/10/2018
Acceptance date: 02/04/2018
Date deposited: 10/12/2018
ISSN (print): 1614-6832
ISSN (electronic): 1614-6840
Publisher: Wiley-VCH Verlag
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