Electrospun conductive polymer nanofibers provide a promising approach for tailoring interfaces in perovskite solar cells, yet the relationship between processing conditions and nanofiber morphology remains insufficiently understood. In this work, PEDOT:PSS nanofiber mats were fabricated via electrospinning using different auxiliary polymers and solvent systems, followed by solvent post-treatment. The effects of key parameters, including spinning distance and ambient humidity, were systematically investigated in relation to fiber morphology and uniformity. The results show that processing conditions strongly influence nanofiber structure, leading to reduced bead defects and improved uniformity. These morphological changes affect perovskite film growth, resulting in larger grain sizes and more homogeneous coverage. Devices incorporating nanofiber-based hole transport layers exhibited improved charge collection compared to conventional PEDOT:PSS films, although overall performance remains modest due to non-optimized device architecture. This study highlights the importance of processing–morphology relationships in electrospun PEDOT:PSS systems and their role in controlling perovskite film formation and interfacial properties.
Mohtaram et al. (Fri,) studied this question.