The Role of Halogen‐Free Solvents on the Stability of PTQ‐2F:BTP‐4F‐Based Organic Solar Cells. - Spanier, Lukas V.; Guo, Renjun; Heger, Julian E.; Schwartzkopf, Matthias; Roth, Stephan V.; Müller‐Buschbaum, Peter (Solar RRL, 2026)