Xia, D., Gehrig, D., Guo, X., Baumgarten, M., Laquai, F., & Müllen, K. (2015). A spiro-bifluorene based 3D electron acceptor with dicyanovinylene substitution for solution-processed non-fullerene organic solar cells. Journal of Materials Chemistry A, 3(20), 11086 -11092. doi:10.1039/c5ta00108k.