溶剂效应对聚苯撑乙烯掺杂二酰亚胺太阳电池性能的影响

Effect of solvent on the performance of poly(2-methoxy-5-(2-ethyl-hexyloxy)-p-phenylene vinylene):N,N'-bis(1-ethylpropyl)-3,4,9,10-perylene bis(tetracarboxyl diimide)solar cells

研究了不同溶剂对2-甲氧基-5-(2-乙基己氧基)-1,4-对苯撑乙烯(MEH-PPV):N,N′-二(1-乙基丙基)-3,4,9,10-四羧酸二亚酰胺(EP-PTC)复合膜的形貌及其对以MEH-PPV:EP-PTC复合膜为活性层的太阳电池性能的影响.结果表明:非芳香性溶剂不利于MEH-PPV与EP-PTC的相容,MEH-PPV与EP-PTC两相间形成微米尺寸(0.5—5μm)的相分离,因而以MEH-PPV:EP-PTC复合膜为活性层的太阳电池中的电荷分离效率较低,进而电池的能量转换效率较低.而芳香性溶剂有利于MEH-PPV与EP-PTC的相容,MEH-PPV与EP-PTC两相间能形成纳米尺度的相分离,因此MEH-PPV与EP-PTC两相间的界面面积明显增加,界面处的电荷分离概率明显提高.与非芳香性溶剂相比,基于芳香性溶剂的复合膜太阳电池的能量转换效率提高了20倍.

The effects of different solvents on the morphology of poly（2-methoxy-5-（2-ethyl-hexyloxy）-p-phenylene vinylene） （MEH- PPV） ： N, N＇-bis （ 1-ethylpropyl）-3,4,9,10- perylene bis （ tetracarboxyl diimide） （ EP- PTC） blend film and the performance of solar cells based on MEH-PPV： EP-PTC blend film were studied. The results show that the phase separation in the blend film using non-aromatic solvents is of micron （0.5-5 μm） size, which leads to low charge separation efficiency and consequently the low power conversion efficiency of the assembled solar cell; whereas the phase separation in the blend film using aromatic solvents is of nano-size, which increases the interface area of the two phases obviously and consequently increases the ratio of charge separation significantly. The power conversion efficiency of solar cells based on MEH-PPV： EP-PTC blend film using aromatic solvents is improved 30 times of magnitude compared with that of solar cell based on the blend film using non-aromatic solvents.