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Enhanced Organic Solar Cell Stability by Polymer (PCPDTBT) Side Chain Functionalization

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Design & Synthesis of Organic Semiconductors (DSOS), Institute for Materials Research (IMO), Hasselt University, Agoralaan 1 − Building D, B-3590 Diepenbeek, Belgium
IMEC, IMOMEC, Universitaire Campus − Wetenschapspark 1, B-3590 Diepenbeek, Belgium
§ Organic and Nanostructured Electronics & Energy Conversion (ONE2) − Electrical and Physical Characterization (ELPHYC), Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1, B-3590 Diepenbeek, Belgium
*Phone: 32 (0)11 268312. E-mail: [email protected]
Cite this: Chem. Mater. 2015, 27, 4, 1332–1341
Publication Date (Web):January 27, 2015
https://doi.org/10.1021/cm504391k
Copyright © 2015 American Chemical Society
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Abstract

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Organic photovoltaics represent a promising thin-film solar cell technology with appealing mechanical, aesthetical, and cost features. In recent years, a strong growth in power conversion efficiency (to over 10%) has been realized for organic solar cells through extensive material and device research. To be competitive in the renewable energy market, further improvements are mandatory though, both with respect to efficiency and lifetime. High intrinsic stability of the photoactive layer is obviously a crucial requirement for long lifetimes, but the generally applied bulk heterojunction blends and their components are prone to light-induced and thermal degradation processes. In the present contribution, the high-Tg polymer strategy is combined with specific side chain functionalization to address the thermal stability of polymer solar cells. These two design concepts are applied to a prototype low bandgap copolymer, PCPDTBT. Accelerated aging tests (at 85 °C) indicate an improved thermal durability of the PCPDTBT:PC71BM blends and the resulting devices by the insertion of ester or alcohol moieties on the polymer side chains. The different stages in the efficiency decay profiles are addressed by dedicated experiments to elucidate the (simultaneously occurring) degradation mechanisms.

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Monomer and polymer synthesis protocols and experimental data, corresponding 1H NMR spectra, thermal analysis (RHC) figures, additional solar cell degradation data, and TEM figures. This material is available free of charge via the Internet at http://pubs.acs.org.

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