Authors: Lin Wen, Houdong Mao, Mofei Ban, Licheng Tan, Jiayou Zhang, Zhao Qin, Lifu Zhang, Yiwang Chen
Published: 2025-04-14
Source: Full article
AbstractPrecisely regulating vertically distributed morphology by blade‐coating process is crucial to realize high‐performance large‐scale pseudo‐planar heterojunction organic photovoltaics (OPVs). However, the thermodynamic motion and random diffusion of donor/acceptor (D/A) generated from the differences in surface energy and concentration during sequentially blade‐coating process will cause great challenges for obtaining ideal active layer morphology. Herein, this study have proposed a self‐assembled interface orthogonal strategy by introducing low surface energy guest (N2200) to form protective layer on PM6 surface, which counteracts erosion from orthogonal solution of acceptor to enhance continuity of D/A phases, thus promoting directional carrier migration and effectively suppressing energetic disorder. Finally, N2200‐modified device achieves the highest power conversion efficiency (PCE) of 19.86%, and large‐area module (16.94 cm2) exhibits exceptional PCE (16.43%). This investigation presents innovative insights into morphology issue triggered by molecular motion and provides an effective method for air‐printing large‐scale OPVs with precisely controlled morphology based on non‐halogenated solvent.