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The sensitizer plays a vital role in the functioning of DSSCs, exerting a significant influence on the device stability as well as the power-conversion efficiency (η). Therefore, many research groups have focused on the design of novel dye molecules that can absorb sunlight in wide spectral window from visible to near infrared wavelength region. The Ru based sensitizers show solar energy-to-electricity conversion efficiency of up to 11% under AM 1.5 irradiation.