Abstract
A co-sensitization approach has been evaluated for achieving enhanced performance in dye sensitized solar cells wherein an amphiphilic ruthenium (II) sensitizer (Ru) is co-sensitized with a simple donor-π-conjugated-acceptor (D–π–A) type metal free alkoxy substituted organic dye (Y3). When compared to the devices fabricated from individual sensitizers, the co-sensitized device (Ru+Y3) showed significantly enhanced Jsc value. Upon optimization, the device made of Ru+Y3 system yielded Jsc=14.32mA/cm2, Voc=0.602V, ff=0.73 and power conversion efficiency (PCE)=6.29%. This performance is superior to that of either of the individual DSSCs sensitized with Ru (PCE=5.21%) and Y3 (PCE=3.30%) under similar fabrication and evaluation conditions. The enhanced PCE has been attributed to the fact that the co-adsorbent effectively overcome the competitive light absorption by I-/I3-, avoid dye aggregation, and reduce the charge recombination.
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