Citation: Zheng Wang, Wei Zhang, Feng Tao, Kai Ge Meng, Long Yi Xi, Ying Li Qing Jiang. Synthesis and properties of two novel copolymers based on squaraine and fluorene units for solar cell material[J]. Chinese Chemical Letters, ;2011, 22(8): 1001-1004. doi: 10.1016/j.cclet.2010.12.052 shu

Synthesis and properties of two novel copolymers based on squaraine and fluorene units for solar cell material

College of Chemistry, Sichuan University, Chengdu 610064, China

Received Date: 26 October 2010

Fund Project: his work was supported by the Key Foundation of Education Ministry of China (No. 20070610053), Sichuan Province Foundation for Youths (No. 2008JY0050) and Technology Research Support Program (No. 09H1016). The authors also acknowledge the Analytical & Testing Center of Sichuan University for the NMR measurements.

Two novel copolymers based on squaraine and fluorine units have been synthesized through palladium catalyzed Suzuki coupling reaction and Sonogashira coupling reaction, respectively. The structures and properties of the two copolymers were characterized by FT-IR, NMR, UV-vis absorbance (Abs), gel permeation chromatography (GPC), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC) and cyclic voltammetry (CV). The solution absorption spectrums of P₁ and P₂ show two distinct absorption bands, one locates at 300-500 nm and the other at 600-800 nm. The absorption spectrums of P₁ and P₂ in films are broadened obviously and the spectral responses are extended up to 900 nm. Thermal gravimetric analysis demonstrates that the polymers are stable. Cyclic voltammetry experiment shows that the band gaps of the copolymers are 1.65 eV and 1.67 eV, respectively, suggesting their potential for applications as solar cells materials.
- Squaraine,
- Polymer,
- Synthesis,
- Organic solar cell materials
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