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高分子光伏材料聚对苯撑乙烯撑(PPV)由于低廉的价格,容易加工的性能与可调的光学性能,有可能成为新一代太阳能材料.然而PPV较宽的带隙阻碍了PPV太阳能电池效率进一步提高.合成了一种较低带隙的新型高分子光伏材料PPV-PQ.用NMR,FT-IR,元素分析,GPC和TGA与循环伏安法对PPV-PQ进行了结构表征与性能检测,并对它在氯仿溶液与固态薄膜下的紫外-可见吸收与荧光发射光谱进行了研究.结果显示,由于在固态下存在较强的分子间作用,分子链的共平面性增加,所以PPV-PQ无论是紫外-可见吸收,还是荧光发射光谱,在固态薄膜下都比在氯仿溶液里发生明显红移.即使在浓溶液中,分子链间也存在较强的作用力,使得PPV-PQ荧光发射峰随溶液浓度的增加而发生红移.紫外-可见光谱显示,PPV-PQ由于大体积的吸电子单元引起了较大的空间位阻,最大吸收峰比PPV稍微蓝移,但吸收却比PPV向长波延展,带隙比PPV低,只有1.92 eV.循环伏安法结果表明PPV-PQ与PCBM两者的LUMO之间有足够的能量差异,加上PPV-PQ与富勒烯衍生物C_(117)共混物薄膜发生荧光猝灭,都说明PPV-PQ上光激发电子能够转移到富勒烯衍生物上.因此,PPV-PO可以用作高分子光伏材料.
Polymer PV Materials Poly-p-phenylenevinylene (PPV) is likely to become the next generation of solar materials due to its low cost, ease of processing and tunable optical properties, however, the wider bandgap of PPV hinders the efficiency of PPV solar cells (PPV-PQ) was synthesized by a new low molecular band gap polymer.The structural and characterization of PPV-PQ was investigated by NMR, FT-IR, elemental analysis, GPC, TGA and cyclic voltammetry , And its UV-Vis absorption and fluorescence emission spectra under chloroform solution and solid state film were studied.The results show that due to the strong intermolecular interaction in the solid state, the coplanarity of the molecular chain increases, so PPV- PQ, both UV-vis absorption and fluorescence emission spectra, show a significant red-shift in solid films than in chloroform solution.Even in strong solution, strong interaction exists between molecular chains, making PPV-PQ fluorescence The emission peak shifted red-shifted with increasing concentration of the solution.The UV-Vis spectra showed that PPV-PQ caused a large steric hindrance due to the bulky electron-withdrawing unit and the maximum absorption peak was a little blue-shifted than that of PPV but the absorption was PPV to the long wave The bandgap was lower than PPV by only 1.92 eV. The results of cyclic voltammetry showed that there was sufficient energy difference between the LUMO of PPV-PQ and PCBM, and the difference between PPV-PQ and fullerene derivative C 117 Fluorescence quenching of the blend films indicates that the PPV-PQ photoexcited electrons can be transferred to fullerene derivatives. Therefore, PPV-PO can be used as a polymer photovoltaic material.