Design and Synthesis of New Fullerene Derivatives for Organic Solar Cells   Jianping Lu, Salima Alem, Afshin Dadvand, Jianfu Ding, and Ye Tao   2018/04/20

Abstract

Bulk heterojunction (BHJ) organic solar cells based on p-type polymers and n-type fullerene derivatives have attracted increasing attention due to their promising potential for providing low–cost solar electricity. In this paper, we will introduce our recent work on the development of new fullerene
derivatives. Through Rh complex catalyzed coupling reactions and cycloaddition reactions, we attached several organic functional groups to the fullerene skeleton. It was found that the organic substituents had little impact on the fullerene energy levels. Instead, the organic substituents have huge impact on the other physical properties of the resulting fullerene derivatives, such as solubility, crystallinity, and electron mobility. We designed and synthesized a novel series of alkoxy substituted
indene derivatives as solubilizing groups for fullerenes. Preliminary experimental results demonstrated that these 5-alkoxyindene modified C70 derivatives are superior to widely used PC71BM when blended with poly[N-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'- benzothiadiazole)] (PCDTBT) in BHJ solar cells. The device series resistance decreased from 10
cm2 for the PC71BM based device to 4 cm2 for the 5-methoxyindene-C70 monoadduct based device. As a result, the device fill factor increased from 0.60 to 0.69, and the overall EQE-calibrated power conversion efficiency was enhanced from 5.6% to 6.2%.

Authors and affiliations

Jianping Lu1, Salima Alem1, Afshin Dadvand1, Jianfu Ding2, and Ye Tao1
1. Advanced Electronic and Photonic Research Centre. National Research Council of Canada, Ottawa, Canada
2. Security and Disruptive Technologies Research Centre. National Research Council of Canada, Ottawa, Canada

Key words

Fullerene derivatives, Organic solar cells, 5-alkoxyindene, substituent effects

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