High efficiency polarization-sensitive organic photovoltaic devices

本文报道了由3,4,9,10-苝四羧基-双苯并咪唑（PTCBI）和酞菁钛（TiOPc）组成的异质结型真空升华多层薄膜制成的偏光敏感光伏器件。在不损失高功率转换效率的情况下，使PTCBI层排列良好。器件结构为ITO/In/取向PTCBI/TiOPc'poly（3,4-乙烯二氧噻吩）：poly（苯乙烯磺酸盐）/Au，并对各层厚度进行了优化。在平行于分子取向轴和垂直于分子取向轴的偏振光下，光能转换效率分别为0.78%和0.45%。当使用波长为540 nm的单色偏振光时，平行与垂直条件下的光电流比最大达到2.32。我们还展示了通过在活性层和上电极之间插入C60中间层来增强聚合物：PCBM混合光伏电池的器件性能。通过自旋涂覆聚（2-甲氧基-5-（20-乙基-己氧基）-1,4-苯基乙烯基）（MEH-PPV）或聚（3-己基噻吩）（P3HT）和富勒烯衍生物[5,6]-苯基- c61 -丁酸甲酯（PCBM）制备活性层，然后沉积C60中间层和LiF/Al电极。有C60中间层的两种聚合物电池与没有C60中间层的电池相比，功率转换效率显著提高。

We have reported the fabrication of polarization-sensitive photovoltaic devices made of heterojunction-type vacuum-sublimed multilayer films composed of aligned 3,4,9,10-perylenetetracarboxylic-bisbenzimidazole(aligned PTCBI) and titanyl phthalocyanine (TiOPc). The PTCBI layer was made to be well aligned without losing high power conversion efficiency. The device configuration was ITO/In/aligned PTCBI/TiOPc'poly(3,4-ethylenedioxythiophene): poly (styrenesulfonate)/Au, and the thickness of each layer was optimized for polarization-sensitive photodetection. The power conversion efficiencies under polarized white light parallel and perpendicular to the molecular orientation axis were 0.78% and 0.45%, respectively. When monochromatic polarized light at 540 nm was used, the photocuxrent ratio of the parallel to the perpendicular condition reached a maximum of 2.32.We have also demonstrated the enhancement of the device performance in polymer: PCBM blend photovoltaic cells by insertion of C60 interlayer between the active layer and the upper electrode. The active layer was fabricated by spin coating of a polymer: poly (2-methoxy-5-(20-ethyl-hexyloxy) -1,4-phenylenevinylene) (MEH-PPV) or poly (3-hexylthiopene) (P3HT) and fullerene derivative [5,6]-phenyl-C61-butyric acid methyl ester(PCBM), then the C60 interlayer and LiF/Al electrode were deposited. The both polymer cells with C60 interlayer showed significant increase in the power conversion efficiency compared to cells without the C60 layer.