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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (21): 2475-2480. 上一篇    下一篇

研究论文

高分子光伏材料聚对苯乙烯撑-喹喔啉共聚物的合成与光学性能研究

张力  张秋禹    高云燕     顾军渭     张和鹏    鄢红陵   

  1. (西北工业大学理学院应用化学系 西安 710072)
  • 投稿日期:2009-01-13 修回日期:2009-06-13 发布日期:2009-07-03
  • 通讯作者: 张秋禹 E-mail:qyzhang@nwpu.edu.cn
  • 基金资助:

    西北工业大学基础研究基金(No. w018102)资助项目

Novel Quinoxaline-based Poly(phenylenevinylene)s Copolymers: Synthesis and Optical Properties

Zhang, Li    Zhang, Qiuyu*      Gao, Yunyan       Gu, Junwei      Zhang, Hepeng      Yan, Hongling   

  1. (Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an 710072)
  • Received:2009-01-13 Revised:2009-06-13 Published:2009-07-03

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1721

被引次数

8

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C117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-PQ可以用作高分子光伏材料.

关键词: 高分子, 光伏材料, 聚对苯撑乙烯撑

A novel poly(phenylenevinylene) copolymer PPV-PQ containing alternating phenyl rings and quinoxaline units has been synthesized and characterized by NMR, FT-IR, TGA, GPC, TGA and elemental analysis. The UV-Vis absorption spectra and PL spectra in solution/films were characterized. The absorption peak and PL emission peak of PPV-PQ in the solid state, were shift to long wavelengths compared to their corresponding peaks in solution due to strong inter-chain interactions and increased coplanarity. The PPV-PQ exhibited a decreased optical band gap (1.92 eV) compared to PPV homopolymer. The HOMO and LUMO levels of PPV-PQ were determined from electrochemical measurements. There is a clear difference between LUMO (－3.16 eV) of polymer and that of PCBM, which makes an effective charge transfer possible between polymers and PCBM. The PL emission intensity of PPV-PQ is almost completely quenched when PPV-PQ is blended with C117. The result shows that PPV-PQ is useful for polymer solar cells.

Key words: polymer, photovoltaic material, (phenylenevinylene)