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Boosting Photovoltaic Thermal Stability of Fullerene Bulk Heterojunction Solar Cells through Charge Transfer Interactions

Abstract

Fullerene-based bulk heterojunction organic solar cells (BHJ-OSCs) represent one of the current state-of-the-art organic solar cells. Nonetheless, most of these devices still suffer from adverse performance degradation due to thermally induced morphology changes of active layers. We herein demonstrate that the photovoltaic performance stability of BHJ-OSCs can be profoundly enhanced with an appositely functionalized 9-fluorenylidene malononitrile. The latter, through charge transfer (CT) interactions with the donor polymer, enabling formation of a “frozen” 3-dimensional mesh-like donor polymer matrix, which effectively restrains free movement of embedded fullerene molecules and suppresses their otherwise uncontrolled aggregation. 9-Fluorenylidene malononitrile derivatives with multiple CT interaction sites are particularly effective as preservation of power conversion efficiency of over 90% under severe thermal stress has been accomplished. The generality of this novel strategy has been affirmed with several common donor polymers, manifestingthis to be hitherto the most efficient approach to stabilized fullerene-based BHJ-OSCs.

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Publication details

The article was received on 26 Jul 2017, accepted on 06 Oct 2017 and first published on 07 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA06530B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Boosting Photovoltaic Thermal Stability of Fullerene Bulk Heterojunction Solar Cells through Charge Transfer Interactions

    C. H. Y. Ho, H. Cao, Y. Lu, T. Lau, S. H. Cheung, H. LI, H. Yin, K. L. Chiu, L. Ma, Y. Cheng, S. W. TSANG, X. Lu, S. So and B. S. Ong, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06530B

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