C101 Dye is ruthenium (Ru) based organic dye that can be used as a heteroleptic thiophene-based sensitizer. It has a high extinction coefficient of 17500 Lmol-1cm-1and facilitates the enhancement of optoelectronic properties of electrochemical devices.C101 Dye can be used as a sensitizer for the fabrication of dye sensitized solar cells (DSSCs) with a power conversion efficiency (PCE) of 10−11%.A ruthenium sensitizer with high molar extinction coefficient for high-performance dye-sensitized solar cellsAlong with an acetonitrile-based electrolyte; the C101 sensitizer achieved a high efficeincy of 11.0-11.3% in the dye-sensitized solar cells under the illumination of AM 1.5G full sunlight.