Linker Engineering in Core-Linked Dimeric Acceptors Utilizing Non-Aromatic Spacers for High-Efficient Organic Solar Cells
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초록
내용
The dimerization of small molecule acceptors (SMAs) is a promising strategy to enhance the long-term stability and power conversion efficiency (PCE) of organic solar cells (OSCs). However, most research has focused on end-linked molecular configurations. Herein, we report the development of two distinct core-linked dimerized SMAs (DYF-V and DYF-E) with vinylene and ethynyl linkers, respectively. DYF-E exhibits more twisted backbone conformation and mitigated aggregation compared to DYF-V, resulting in better blend morphologies and higher crystallinity in OSCs. Consequently, DYF-E-based OSCs exhibit a higher PCE (17.02%) compared to DYF-V-based OSCs (PCE = 9.98%). Furthermore, the ternary OSCs based on DYF-E achieve an even higher PCE of 18.53%. This work suggests a desirable linker choice to make high-efficient dimeric acceptors in core-linked structures.