We report organic solar cells (OSCs) with non-fullerene small molecule acceptors (SMAs) prepared in large area via a roll coating process. We employ all solution-processed indium tin oxide (ITO)-free flexible substrates for inverted solar cells with a new SMA of F(DPP)(2)B-2. By utilizing poly(3-hexylthiophene) as donor blended with F(DPP)(2)B-2 as acceptor, ITO-free large-area flexible SMA based OSCs were produced under ambient conditions with the use of slot-die coating and flexographic printing methods on a lab-scale compact roll-coater that is readily transferrable to roll-to-roll processing. The effect of different processing solvents on the device performance was investigated, and the best performance with a power conversion efficiency of 0.65%, an open circuit voltage of 0.85 V, a short-circuit current density of 2.19 mA cm(-2), and a fill factor of 35% was obtained.
R S C Advances, 2015, Vol 5, Issue 45, p. 36001-36006
CHEMISTRY,; POWER CONVERSION EFFICIENCY; ORGANIC PHOTOVOLTAICS; ELECTRON-ACCEPTOR; DESIGN; DIKETOPYRROLOPYRROLE; MORPHOLOGY; SINGLE; FUTURE; FILM; Coatings; Fullerenes; Molecules; Open circuit voltage; Rolls (machine components); Tin oxides; Device performance; Flexible solar cells; Flexible substrate; Flexographic printing; Inverted solar cells; Poly (3-hexylthiophene); Power conversion efficiencies; Roll-to-roll processing; Solar cells