Near-infrared absorbing unsymmetrical Zn(II) phthalocyanine for dye-sensitized solar cells

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• 作者：Varun Kumar Singh ; Paolo Salvatori ; Anna Amat ; Saurabh Agrawal ; Filippo De Angelis ; Md.K. Nazeeruddin ; Narra Vamsi Krishna ; Lingamallu Giribabu
• 关键词：Phthalocyanine ; Unsymmetrical phthalocyanine ; Dye-sensitized solar cells ; Spectroelectrochemal ; Redox electrolyte
• 刊名：Inorganica Chimica Acta
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：407
• 期：Complete
• 页码：289-296
• 全文大小：1465 K

文摘

Unsymmetrical Zn phthalocyanine consisting of six S-aryl groups at ¦Á-positions and a carboxy anchoring group at ¦Â-position has been designed and synthesized for dye-sensitized solar cells (DSCs) applications. The unsymmetrical phthalocyanine has been characterized by elemental, MALDI-MS, IR, ¹H NMR, UV-Vis, fluorescence (steady-state & lifetime) and electrochemical (including spectroelectrochemical) methods. The Q-band absorption maxima of the unsymmetrical phthalocyanine was red-shifted due to the presence of S-aryl groups, which destabilizes the HOMO level consistent with electrochemical and in situ spectroelectrochemical studies. The redox processes are assigned to the macrocyclic ring-based electron transfer processes, the LUMO of the unsymmetrical phthalocyanines lies above the TiO₂ conduction band, and the HOMO is well below the potential of the I^?/I₃^? redox electrolyte. The experimental results are supported by DFT/TD-DFT studies. The new unsymmetrical phthalocyanines was tested in DSCs using I^?/I₃^? redox electrolyte system.