Abstract
Side-chain properties of π-conjugated wide bandgap (WBG) polymers have been widely studied for application in all-polymer solar cells (all-PSCs), but the siloxane functionalized side-chains based polymers has been rarely reported. In this regard, we systematically explored a π-conjugated WBG polymer with a distinct side-chain of siloxane functionality for high performance all-PSCs. We found that the π-conjugated WBG polymer (Si-BDT) has good absorption spectra with polymer acceptor (P(NDI2OD-T2)), high charge carrier mobility and enhanced bulk-heterojunction morphology. When the polymer with siloxane functionalized side-chain had power conversion efficiency (PCE) of 7.54% with significantly enhanced photocurrent and fill factor. Notably, the additive-free Si-BDT:P(NDI2OD-T2) exhibits stable characteristics. These results demonstrate that siloxane functionalized side chains are a promising strategy to design new π-conjugated polymers toward the stable all-PSCs.
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Acknowledgment
This work was supported by a 2-Year Research Grant of Pusan National University.
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Yeongju Do: Conceptualization, Methodology, Formal analysis, Writing - original draft. Hyungjin Park: Formal analysis, Data curation. Thavamani Gokulnath: Formal analysis, Data curation, Writing - original draft. Kyungmin Sung: Visualization, Investigation. Ho-Yeol Park: Methodology, Formal analysis. Sung-Ho Jin: Writing - Review & Editing, Supervision, Project administration, Funding acquisition.
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Do, Y., Park, H., Gokulnath, T. et al. Significance of Siloxane Functionalized Side-Chain π-Conjugated Polymer Donor: Optimization of Active Layer Morphology Toward the Stable All-Polymer Solar Cells. Macromol. Res. 30, 183–189 (2022). https://doi.org/10.1007/s13233-022-0024-x
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DOI: https://doi.org/10.1007/s13233-022-0024-x