Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Threenew metal-free organic sensitizers containing 11,12-bis(hexyloxy) dibenzo[a,c]phenazine (BPz) unit as the conjugated bridge were synthesized and used for dye-sensitized solar cells (DSCs).The BPz unit can act as the auxiliary acceptor to extend the absorption spectra, leading to the enhancement of the light harvesting abilities. Moreover, the extension of the conjugation system in the orothogonal directions of BPzmoieties can also serve as the isolation group to prevent the intermolecular π-π aggregation, and reduce the degree of charge trapping at the electron deficient moiety. Among these sensitizers, LI-39 showed the best photovoltaic performance: a short-circuit photocurrent density (Jsc) of 14.40 mA cm-2, an open-circuit photovoltage (Voc) of 0.74 V, and a fill factor (ff) of 0.67, corresponding to an overall conversion efficiency of 7.18% under standard global AM 1.5 solar light condition. The result shows that the organic sensitizers based on this bulky fused aromatic rings as well as the auxiliary acceptor are the promising candidates for improvement of the performance of DSSCs.
Fig.1 the structures of the organic sensitizers bearing BPz unit
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