Azo-coupled zinc phthalocyanines: Towards broad absorption and application in dye-sensitized solar cells

作者：Han Mingliang; Zhang Xuejun^*; Zhang Xiaoxia; Liao Chaoqiang; Zhu Baiqing; Li Qiaoling

来源：Polyhedron, 2015, 85: 864-873.

DOI：10.1016/j.poly.2014.10.026

• Azobenzene
• Phthalocyanines
• Dye-sensitized solar cells
• Absorption spectra
• Electrochemistry

The synthesis of symmetrical azo-coupled zinc phthalocyanines (7, 8, 10 and 11) incorporating two spectrally complementary photogenerators (azo dyes and phthalocyanines) by N=N double bonds in a single structure was described. The four sensitizers were fully characterized by Fourier Transform infrared spectroscopy, UV-Vis spectroscopy, proton nuclear magnetic resonance, mass spectrometry, elemental analyses, thermogravimetric analysis and cyclic voltammetry. All the azo-coupled phthalocyanines exhibited broad absorptions covering the range 300-800 nm. The cyclic voltammetry studies indicated that the LUMO and HOMO energy levels of four synthesized azo-coupled phthalocyanines could ensure efficient electron injection and thermodynamically favorable dye regeneration. Thermal stability studies showed that the four sensitizers were stable above 200 degrees C. The new compounds were tested in dye-sensitized solar cells and compound 8 showed the best photovoltaic performance, yielding 2.7% power conversion efficiency.

• 出版日期2015-1-8
• 单位中北大学