Supporting Information Unprecedented low energy losses in organic solar cells with high external quantum efficiencies by employing non-fullerene electron acceptors Amaresh Mishra,* a,f Mukhamed L. Keshtov, b Annika Looser, a Rahul Singhal, c Matthias Stolte, d Frank Würthner, d Peter Bäuerle, a and Ganesh D. Sharma* e a Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany b A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, Moscow 119991, Russia c Department of Physics, Malaviya National Institute of Technology, Jaipur (Raj), India d Institut für Organische Chemie & Center for Nanosystems Chemistry, Universität Würzburg Am Hubland 97074, Würzburg, Germany e Department of Physics, The LNM Institute of Information Technology (Deemed University), Rupa ki Nagal, Jamdoli, Jaipur, Rajasthan, 302031, India. Email: gdsharma273@gmail.com f Current address: School of Chemistry, Sambalpur University, Jyoti Vihar-768019, Sambalpur, India. Email: amaresh.mishra@suniv.ac.in 0.0 0.5 1.0 1.5 2.0 2.5 0.01 0.1 1 10 100 PY-1 DCI-2 Current density [mA cm -2 ] V appl -V bi [V] Figure S1. Current voltage characteristics in dark for ITO-Al/ PY-1 or DCI-2/Al devices to measure the electron mobility, Solid lines are SCLC fitting. Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is © The Royal Society of Chemistry 2017