A new polymer donor (PBDB-T-SF) and a new small molecule acceptor (IT-4F) for fullerene-free organic solar cells (OSCs) were designed and synthesized. The influences of fluorination on the absorption spectra, molecular energy levels, and charge mobilities of the donor and acceptor were systematically studied. The PBDB-T-SF:IT-4F-based OSC device showed a record high efficiency of 13.1%, and an efficiency of over 12% can be obtained with a thickness of 100–200 nm, suggesting the promise of fullerene-free OSCs in practical applications.

中文翻译：

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分子优化使有机太阳能电池的效率超过13％

设计并合成了用于无富勒烯有机太阳能电池（OSC）的新型聚合物供体（PBDB-T-SF）和新型小分子受体（IT-4F）。系统地研究了氟化对供体和受体的吸收光谱，分子能级和电荷迁移率的影响。基于PBDB-T-SF：IT-4F的OSC器件显示出创纪录的13.1％的高效率，并且在100-200 nm的厚度下可获得超过12％的效率，这表明了无富勒烯OSC的前景在实际应用中。