Dynamic PCBM:dimer population in solar cells under light and temperature fluctuations

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Title: Dynamic PCBM:dimer population in solar cells under light and temperature fluctuations
Authors: Pont, S
Durrant, JR
Cabral, JT
Item Type: Journal Article
Abstract: Photoinduced dimerization of phenyl-C61-butyric acid methyl ester (PCBM) has a significant impact on the stability of polymer:PCBM organic solar cells (OSCs). This reaction is reversible, as dimers can be thermally decomposed at sufficiently elevated temperatures and both photodimerization and decomposition are temperature dependent. In operando conditions of OSCs evidently involve exposure to both light and heat, following periodic diurnal and seasonal profiles. In this work, the kinetics of dimer formation and decomposition are examined and quantified as a function of temperature, light intensity, blend composition, and time. The activation energy for photodimerization is estimated to be 0.021(3) eV, considerably smaller than that for decomposition (0.96 eV). The findings are benchmarked with a variety of conjugated polymer matrices to propose a descriptive dynamic model of PCBM:dimer population in OSCs, and a framework is proposed to rationalize its interplay with morphology evolution and charge quenching. The model and parameters enable the prediction of the dynamic and long-term PCBM:dimer populations, under variable temperature and light conditions, which impact the morphological stability of OSCs.
Issue Date: 16-May-2019
Date of Acceptance: 27-Mar-2019
ISSN: 1614-6832
Publisher: Wiley
Journal / Book Title: Advanced Energy Materials
Volume: 9
Issue: 19
Copyright Statement: © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Publication Status: Published
Embargo Date: 2020-03-27
Article Number: 1803948
Online Publication Date: 2019-03-27
Appears in Collections:Chemistry
Chemical Engineering
Faculty of Natural Sciences

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