Fig. 3: Structural characterizations of photo-illuminated NFAs.
From: Molecular insights of exceptionally photostable electron acceptors for organic photovoltaics
1H NMR of a, IT-4F and b, PTIC in solution under continuous one-sun-equivalent illumination. Line 1–8 represents the signals at different times (fresh, 10 h, 20 h, 30 h, 40 h, 60 h, 80 h, 100 h). c Raman spectra of IT-4F, HF-PCIC, and PTIC under continuous one-sun-equivalent illumination. The highlighted purple peaks represent the signals of the vinyl bond. d Time-resolved photoluminescence for IT-4F, HF-PCIC, and PTIC in solution. e MALDI-TOF of IT-4F film before and after illumination in ambient.
