Furthermore, we demonstrate that this fiber-like aggregation in solution leads to inferior device performance and unfavorable morphology consisting of large domains without preferential molecular orientations when the films were printed at room temperature. However, when a high coating temperature was used, these large fiber-like aggregates dissolve and the resulting networklike aggregates led to favorable BHJ morphology composed of small domain sizes with face-on dominant molecular orientation which significantly enhanced the device performance. On the other hand, regardless of the coating temperature employed, PM7 D1 and D2 based devices exhibited favorable BHJ morphology and maintained their high performances owing to their temperature stable network-like aggregated structure in solution. Overall, our findings suggest that the polymer aggregate structure in the solution-state determines the solid-state morphology and processing resiliency of non-fullerene OSCs. In particular, we propose that obtaining polymer network-like structures in the solution-state is critical in forming a favorable BHJ morphology, leading to processing resilient film structures and, ultimately, optimization of device performance of OSCs.