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Dye sensitized solar cells; phthalocyanine; extended 𝜋-conjugation; unsymmetrical zinc phthalocyanine and redox electrolyte.

We have designed and synthesized a new unsymmetrical zinc phthalocyanine based on `push-pull’ and extended 𝜋-conjugation concept, PCH008. The new sensitizer was fully characterized by CHN anlysis, UV-Vis., fluorescence spectroscopies and cyclic voltammetry. The new sensitizer which upon anchoring onto nanocrystalline TiO₂ film exhibit a short circuit current of 5.63 mA cm^-2, open circuit potential of 557.0 mV and a fill factor of 0.75 corresponding to an overall conversion efficiency of 2.35% under standard global air mass (AM) 1.5 solar conditions and compared its performance with literature reported phthalocyanine dyes.

L Giribabu¹ Ch Vijay Kumar¹ P Yella Reddy¹ Jun-Ho Yum² M Grätzel² Md K Nazeeruddin²

1. Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500 007
2. Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of basic Sciences, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland

Published

January 2009

Manuscript received

11 February 2008

Manuscript revised

24 October 2008