1 New indole based co-sensitizers for dye sensitized solar cells exceeding 10% efficiency Dickson D. Babu † , Rui Su ‡ , Ahmed El-Shafei* ‡ and Airody Vasudeva Adhikari * † † Organic Materials Laboratory, Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, India. ‡ Polymer and Color Chemistry Program, North Carolina State University, Raleigh, NC, 27695, USA. Electronic Supplementary Information DSSC fabrication and characterization 3 Calculation of GSOP by Cyclic Voltammetry 4 Figure 1S Nyquist and Bode plots for N719 5 Table 1S. Cartesian coordinates for the optimized geometry of DBA-3 5 Table 2S. Cartesian coordinates for the optimized geometry of DBA-4 7 Table 3S. Cartesian coordinates for the optimized geometry of DBA-4 8 Figure 2S. 1 H NMR spectrum of 2 in CDCl 3 9 Figure 3S. 13 C NMR spectrum of 2 in CDCl 3 10 Figure 4S. 1 H NMR spectrum of 3 in CDCl 3 10 Figure 5S. 1 H NMR spectrum of DBA-3 in DMSO 11 Figure 6S. 13 C NMR spectrum of DBA-3 in DMSO 11 Figure 7S. 1 H NMR spectrum of 5a in CDCl 3 12 Figure 8S. 1 H NMR spectrum of DBA-4 in DMSO 12 Figure 9S. 13 C NMR spectrum of DBA-4 in DMSO 13 Figure 10S. 1 H NMR spectrum of DBA-5 in DMSO 13 Electronic Supplementary Material (ESI) for RSC Advances. This journal is © The Royal Society of Chemistry 2016