Liao Chentong, Xu Xiaopeng, Yang Tongyan, Qiu Wuke, Duan Yuwei, Li Ruipeng, Yu Liyang, Peng Qiang
College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, P. R. China.
School of Chemical Engineering and State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P. R. China.
Adv Mater. 2024 Nov;36(48):e2411071. doi: 10.1002/adma.202411071. Epub 2024 Oct 14.
Developing organic solar cells (OSCs) processable with halogen-free, non-aromatic solvents is crucial for practical applications, yet challenging due to the limited solubility of most photoactive materials. This study introduces high-performance terpolymers processable in tetrahydrofuran (THF) by incorporating dithienophthalimide (DPI) into the PM6 backbone. DPI extends the absorption band, lowers HOMO levels, and improves THF solubility and film crystallinity through its large dipole moment effect. Optimal PBD-10:L8-BO devices processed with THF achieved a competitive power conversion efficiency (PCE) of 18.79%, approaching chloroform-processed devices (19.04%). By introducing PBTz-F as a second donor, ternary OSCs reached an impressive 19.45% PCE when processed with THF. This improvement stems from enhanced photon generation, improved morphology, better charge transport, longer exciton lifetimes, efficient charge dissociation and collection, and suppressed recombination. These PCEs of 18.79% and 19.45% for binary and ternary blend OSCs, respectively, represent the highest reported efficiencies for OSCs processed with halogen-free, non-aromatic solvents. This work demonstrates significant progress in eco-friendly OSC fabrication, paving the way for more sustainable and commercially viable organic photovoltaic technologies.
开发可使用无卤、非芳香族溶剂进行加工的有机太阳能电池（OSC）对于实际应用至关重要，但由于大多数光活性材料的溶解度有限，这一过程具有挑战性。本研究通过将二噻吩并苯二甲酰亚胺（DPI）引入PM6主链，引入了可在四氢呋喃（THF）中加工的高性能三元共聚物。DPI通过其大偶极矩效应扩展了吸收带，降低了最高占据分子轨道（HOMO）能级，并提高了THF溶解度和薄膜结晶度。用THF加工的最佳PBD-10:L8-BO器件实现了18.79%的有竞争力的功率转换效率（PCE），接近用氯仿加工的器件（19.04%）。通过引入PBTz-F作为第二施主，三元有机太阳能电池在用THF加工时达到了令人印象深刻的19.45%的功率转换效率。这种提高源于增强的光子产生、改善的形貌、更好的电荷传输、更长的激子寿命、有效的电荷解离和收集以及抑制的复合。二元和三元共混有机太阳能电池的这些功率转换效率分别为18.79%和19.45%，代表了用无卤、非芳香族溶剂加工的有机太阳能电池报道的最高效率。这项工作展示了在环保型有机太阳能电池制造方面的重大进展，为更可持续和具有商业可行性的有机光伏技术铺平了道路。
