1 Department of Energy Conversion and Storage, Technical University of Denmark2 Functional organic materials, Department of Energy Conversion and Storage, Technical University of Denmark3 Zhejiang University4 Risø National Laboratory for Sustainable Energy, Technical University of Denmark5 Chinese Academy of Sciences6 Peking University7 Peking University
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