Supporting Information Pyrazine Incorporated Panchromatic Sensitizers for Dye Sensitized Solar Cells under One Sun and Dim Light Mulu Berha Desta, a,b,c,d Nguyễn So'n Vinh, e CH Pavan Kumar, a Sumit Chaurasia, a Wei-Ti Wu, a Jiann T. Lin, a * Tzu-Chien Wei, e * Eric Wei-Guang Diau c a Institute of Chemistry, Academia Sinica, Nankang, Taipei−115, Taiwan b Taiwan International Graduate Program (TIGP), Sustainable Chemical Science and Technology (SCST), Academia Sinica, Taipei, Taiwan c Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan d Department of Chemistry, Mekelle University, Mekelle, Ethiopia e Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan jtlin@gate.sinica.edu.tw, tcwei@mx.nthu.edu.tw Experimental Procedures Synthesis of 3, 6-dibromobenzene-1, 2-diamine 4, 7-Dibromobenzothiadiazole (17 mmol, 5.0 g) was suspended in ethanol (250 mL) at 10 o C under nitrogen. After the slow addition of NaBH4 (238 mmol, 9.0 g) the mixture was stirred at room temperature for 20 h. The solvent was evaporated and the raw product was poured into H2O (100 mL) then extracted with DCM (200 mL). The organic layer was washed with brine solution and dried over anhydrous MgSO4. After removing the solvent under reduced pressure, the residue Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is © The Royal Society of Chemistry 2018