Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
A series of novel perylene and N-annulated perylene dyes with a push-pull framework have been prepared and used in dye-sensitized solar cells (DSSC). Their spectral, electrochemical and photovoltaic properties were investigated. All of these dyes show large absorption extinction coefficients in a relatively narrow spectrum range 400–550 nm. All the HOMO and LUMO energy levels are appropriate for effective electron injection to the conduction band of TiO2 and dye regeneration. The photovoltaic measurements show that these new dyes achieve a power conversion efficiency over 5%, which is efficient as considering the simplicity of the molecular structures. The best performing device gives a power conversion efficiency of 5.85% with Jsc=11.29 mAcm–2, Voc=718 mV, and fill factor FF=0.72 under standard AM 1.5 sunlight The photovoltaic performance of these solar cells depends markedly on the molecular structures of the dyes in terms of the nature of the donor unit. Introduction of a diphenylamine or dialkylaniline push unit to the position opposite the anchoring carboxyl group is demonstrated to be achievable, and these push-pull perylene dyes are promising candidates for highly efficient DSSC.
Acknowledgement
This work was supported by National Science Council, National Chung Hsing University, and Formosa Plastics Group.
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