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Fullerene-induced fibril network morphology for high-performance inkjet-printed organic solar cells
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DOI：10.1007/s11426-026-3486-9.png)
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Abstract
En 中文
Inkjet printing (IJP) is a non-contact digital technique for the industrialization of organic solar cells (OSC). It features high material utilization and roll-to-roll compatibility. Moreover, its droplet-to-droplet film formation makes it an ideal model to study the intrinsic morphology evolution of OSCs in high-boiling-point solvent systems. However, the slow evaporation of the high-boiling point solvents often induces premature acceptor aggregation and abnormal crystallization, resulting in inferior active layer morphology and compromised device performance. This work proposed a fullerene derivative-induced crystallization sequence regulation strategy in the inkjet-printed OSCs. It demonstrated that the fullerene derivatives strongly interacted with acceptors via synergistic electrostatic interactions, which inhibited the excessive acceptor aggregation and promoted the crystallization of the donor in a fiber morphology. In addition, this strategy showed good universality in a series of donor and acceptor systems. Due to the formation of a fiber morphology in the printed films, the efficiency of the inkjet-printed device improved from 15.28% to 17.37%. This work provided a practicable pathway to induce the fiber crystallization in the printed films, which would be a good strategy for improving the performance of the printed devices.
Keywords:
inkjet printing
morphology regulation
fibril network morphology
crystallization sequence control
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