Recent Progress in All-Solution-Processed Organic Solar Cells

All-solution-processed organic solar cells (OSCs) (from the bottom electrode to the top electrode) are highly attractive thanks to their low cost, lightweight and high-throughput production. However, achieving highly efficient all-solution-processed OSCs remains a significant challenge. One of the key issues is the lack of high-quality solution-processed electrode systems that can replace indium tin oxide (ITO) and vacuum-deposited metal electrodes. In this paper, we comprehensively review recent advances in all-solution-processed OSCs, and classified the devices as the top electrode materials, including silver nanowires (AgNWs), conducting polymers and composite conducting materials. The correlation between electrode materials, properties of electrodes, and device performance in all-solution-processed OSCs is elucidated. In addition, the critical roles of the active layer and interface layer are also discussed. Finally, the prospects and challenges of all-solution-processed OSCs are presented.