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New Generation Hole Transporting Materials for Perovskite Solar Cells: Amide-Based Small-Molecules with Nonconjugated Backbones

Lookup NU author(s): Dr Pablo Docampo

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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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Abstract

© 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.


Publication metadata

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

Year: 2018

Volume: 8

Issue: 32

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

URL: https://doi.org/10.1002/aenm.201801605

DOI: 10.1002/aenm.201801605


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