Variance-resistant PTB7 and axially-substituted silicon phthalocyanines as active materials for high-Voc organic photovoltaics

Abstract While the efficiency of organic photovoltaics (OPVs) has improved drastically in past decade, such devices rely on exorbitantly expensive materials that are unfeasible for commercial applications. Moreover, examples high voltage single-junction devices, which necessary several applications, particularly low-power electronics and rechargeable batteries, lacking literature. Alternatively, silicon phthalocyanines (R 2 -SiPc) inexpensive, industrially scalable semiconductors, having a minimal synthetic complexity (SC) index, capable producing voltages when used as acceptors OPVs. In present work, we have developed OPVs composed poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b?]dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno [3,4 b]thiophenediyl}) (PTB7) an SiPc derivative ((3BS) -SiPc). changes to solvent system had strong effect performance, interestingly, PTB7:(3BS) -SiPc active layer were robust spin speed, annealing components ratio. This invariance is desirable characteristic industrial production. All produced open circuit between 1.0 1.07 V, while maintaining 80% overall efficiency, compared their fullerene-based counterpart.