Journal
ORGANIC ELECTRONICS
Volume 35, Issue -, Pages 151-157Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2016.05.012
Keywords
Organic solar cell; Small molecule; Non-fullerene acceptor; Solution-processed; Perylene diimide; Solubility
Funding
- NSERC CREATE DREAMS
- NSERC (RGPIN) [298170-2014, 435715-2013]
- Killam Trusts
- NSERC
- Canada Research Chairs Program
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Perylene diimide derivatives have been under intense investigation to replace fullerenes as the electron accepting component in organic photovoltaics, with molecular complexity continuing to grow. Simple alkyl-substituted perylene diimide monomers at the imide nitrogen position, however, have not been extensively investigated. Herein we demonstrate that subtle alkyl-substitutions at the imide-nitrogen position lead to significant changes in solubility, thin-film self-assembly and optical properties. When blended with a small-molecule donor to form all small-molecule, fullerene-free, solution processed organic solar cells, we show that the photovoltaic device performance and consistency can be tuned via alkyl-chain modifications. In addition we have simplified the device fabrication process by utilizing a silver cathode coupled with a small-molecule-ionic interlayer and achieved comparable performance to devices fabricated with a traditional Ca/Al cathode. (C) 2016 Elsevier B.V. All rights reserved.
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