Electronic and Optical Functionality and Photovoltaic Application of Conducting Polymer-Fullerene-Nanotube Composite

本文研究了导电聚合物中极化子的光激发动力学和相互作用，以及它们与富勒烯和碳纳米管的相互作用，研究了它们的高效光伏特性和新型功能，制备了富勒烯和碳纳米管掺杂的导电聚合物复合体系，并从光电性质的角度讨论了它们的基态和光激发态。利用取代富勒烯和内嵌金属富勒烯，可以在具有导电聚合物的分子系统中观察到有效的光诱导电荷转移，发现了富勒烯取代基对光伏性质的影响.聚富勒烯光激发下自由载流子前体极化子对的衰减动力学利用双相关脉冲激光技术，在皮秒时域内直接观察到了外加电场作用下3-辛基噻吩的光致发光。E ...更多信息 实验表明，在光吸收之后没有任何明显延迟地产生极化子对。在足够高的激发强度下，自由电荷载流子已经被证明参与了由两个相邻极化子对复合产生的光电流的二级过程。结果表明，存在两种寿命的极化子对，高电场强度使衰减时间缩短，极化子对是二阶光电流的主要来源。本文还讨论了皮秒时域内光致发光的直接观测。通过在ITO薄膜上旋涂导电聚合物溶液制备的富勒烯/导电聚合物异质结光伏电池的光伏特性。通过这种工艺制造的光伏电池已经证明了基于导电聚合物的太阳能电池的高效率。从富勒烯/导电聚合物异质结的光学性质和表面形貌的扫描电镜和原子力显微镜观察，证实了富勒烯与导电聚合物的互穿界面是高光伏性能的重要原因。并且在用反式-1，2-二氯乙烯旋涂处理的情况下获得了纳米棒形表面。富勒烯薄膜的场发射性能与表面形貌有关。少

Photo-excitation dynamics and interactions between polarons in concucting polymers and its interaction with fullerene and carbon nanotube have been studied, and highly efficient photovoltaic properties and novel functionality have been investigated.Composite systems of conducting polymers doped with fullerene and nanotube have been prepared, and their ground state and photo-excited state have been discussed from the results of optical and electrical properties. Utilizing substituted fullerenes and an endohedral metallofullerene, the efficient photo-induced charge transfer could be observed in the molecular systems with conducting polymers, and the photovoltaic properties depending on the substituents of fullerene have been found.Kinetics of decay of polaron pairs as precursors of free charge carriers at photoexcitation of poly(3-octylthiophene) under applied electrical field have been observed directly within a picosecond time domain by using the two-correlated-pulse laser technique. E … More xperiments have shown that polaron pairs were generated without any noticeable delay after the light absorption. At high enough excitation intensity, free charge carriers have been shown to take part in the second-order processes photocurrent produced by the recombination of two neighboring polaron pairs. It has been clarified that polaron pairs with two kinds of lifetimes exist and the decay time decreases by high electrical field strength, and that polaron pair is the main origin of the second-order photocurrent. The direct observation of photoluminescence within a picosecond time domain has been also discussed.Photovoltaic properties of a photovoltaic cell with a fullerene/conducting polymer heterojunction in the photovoltaic cell fabricated by spin-coating the solution of conducting polymer onto the fullerene thin film formed on ITO. Fabricated by this process, the photovoltaic cell has demonstrated the high efficiency for solar cells based on conducting polymers. From the optical properties of fullerene/conducting polymer heterojunction and the direct surface observation by using scanning electron microscope and atmic force microscope, it has been clarified that the interpenetrating interface of fullerene and conducting polymer contributes to the high photovoltaic performance.Surface morphology of fullerene films fabricated by vacuum deposition was modified by a spin-cast treatment process with various organic solvents used in the, and a nano-rod-shape surface has been obtained in the case of spin-cast treatment with trans-1,2-dichroloethylene. The field emission properties of fullerene films, the surface of which were modified, have been found to depend on the surface morphology. Less