Xiao, L. et al. Multiple Roles of a Non-fullerene Acceptor Contribute Synergistically for High-Efficiency Ternary Organic Photovoltaics. Joule.
Doi:https://doi.org/10.1016/j.joule.2018.08.002.
http://www.sciencedirect.com/science/article/pii/S2542435118303829.