Trans-A2B2 Zn(II) porphyrin dyes with various donor groups and their Co-sensitization for highly efficient dye-sensitized solar cells

Four Trans-A2B2 Zn(II) porphyrin dyes (KP-Zn-BTP, KP-Zn-CBZ, KP-Zn-PYR and KP-Zn-PTZ) with different donors were applied for photovoltaic application. The co-sensitization of these dyes with N719 dye improved their DSSCs efficiency from η = 1.71-5.48% to 4.88-8.80% by increasing the light harvesting ability in Soret and Q band region. Phenothiazine appended dye (KP-Zn-PTZ) exhibited maximum power conversion efficiency (η = 8.80%) as compared to other dyes due to strong electron-donating ability and effective suppression of dye aggregation.267