High-performance Y6 homojunction organic solar cells (Withdrawn by Authors)

Single material active layer (i.e., homojunction) architectures could significantly simplify the large-scale fabrication process, but so far solution-processed homojunction OPV devices have achieved only modest PCEs < 1.5%. Recent studies of the optoelectronic properties of the NFA Y6 have described its capability to achieve spontaneous free charge generation, making it a strong candidate for improving homojunction device performance. We report the results from a systematic investigation into how device architecture and the choice of charge transport layers affect Y6 homojunction OPV performance. We find the choice of the charge transport layers to be critical to ensuring efficient charge extraction from the Y6 layer, with maximum PCEs exceeding 2.5% – the highest reported efficiency for any solution-processed small molecule homojunction OPV device to date.