Containing Perylene Polymer Photovoltaic Materials Synthesis And Characterization,

Peryleneimides have the advantages of thermo stability, exellence in chemical and optoelectical features. The present thesis tries to combine these characteristics of peryleneimides with the processability and flexibility of polymers, aming to get suitable materials for photovoltaic applications.Firstly, starting from molecular design, a perylenetetracarboxylic acid bisimides monomer bearing two aldehyde groups (PLCO) was prepared through the functionalization of 3,4,9,10-perylene-tetracarboxylic dianhydride. Another new dianhydride monomer, 1,7-bis(N-piperidyl)-perylenetetracarboxylic dianhydride (PePD) was also synthesized.By using the monomer PLCO, a serie of perylene-containing polymers, named as PCN, PPOW and PBC, were designed and synthesized through Wittig, Knoevenagel condensations. Another series of perylene-containing polyimides, B12B, B12 and B126F, were synthesized through condensations starting from the monomer PePD.The prepared polymers were characterized by using GPC, FT-IR, UV-vis, TG and CHI650, etc. ~1H-NMR and FT-IR proved the successful synthesis of all monomers and polymers. TG analysis revealed that all the polymers have excellent thermal stability. Polymers PCN, PPOW and PBC showed strong absorptions in the range of 400 nm-600 nm on their UV-vis spectra, and the band gap of these polymers were calculated as about 2.0 eV. While, polymers B12 and B126F have strong absorptions in the range of 600 nm-850 nm, and the polymer B12 even have a broader absorption ranging from 400 nm to 850 nm which is quite matching with the solar spectrum. The band gap of polymers B12B, B12 and B126F were calculated as about 1.50 eV. Cyclic voltammetry analysis illustrated that each of polymers PCN, PPOW and PBC has a stable and reversible redox pair at -0.50 V, and the LUMO energy level of these polymers were about -4.20 eV. The stable and reversible redox pair of polymer B126F appeared at -0.55 V, and the LUMO energy level was -4.16 eV.In addition, the prepared polymers showed good solubility in common organic solvents, which is beneficial for device fabrication in photovoltaic applications.