Influence of electric fields on morphology and performance of compatibilized all-polymer solar cells

该项目是一种结合化学和界面科学(Ludwigs)和器件工程(Würfel)的跨学科方法，研究高度有序的纳米结构对导电聚合物/无机混合太阳能电池的影响。将以噻吩基聚合物和纳米氧化锌为模型体系。具有激子扩散长度尺度的高度交叉的施主/受主网络将被量身定做，以实现施主和受主之间的高界面面积和最小的载流子到电极的传输路径长度。在第一种方法中，将在交叉型纳米电极阵列上原位研究电场和受控的溶剂蒸气气氛对半导体聚合物基质中的氧化锌纳米棒排列的影响。在第二种方法中，将分别通过嵌段共聚自组装和溶剂辅助纳米压印光刻来制备高度有序的2个氧化锌纳米棒和聚合物纳米棒阵列。这些模板随后将与互补成分一起渗透。新的太阳能电池设计原理和电极材料的变化将被用来设计半导体/电极界面。有序形貌对载流子输运和器件整体性能的影响将通过不同的表征方法来阐明。太阳能电池的光学和电学建模将提供对器件物理的更深层次的了解，并评估不同形态的优化潜力。

The project is an interdisciplinary approach combining chemistry and interface science (Ludwigs) and device engineering (Würfel) to study the influence of highly ordered nanostructures within se-miconducting polymer/inorganic hybrid solar cells. Thiophene based polymers and nanosized ZnO will be used as model system. Highly interdigitating donor/acceptor networks with dimensions on the scale of the exciton diffusion length will be tailor-made to achieve both a high interfacial area between the donor and the acceptor and a minimization of the transport pathlengths of the charge carriers to the electrodes. In a first approach, the influence of electric fields and controlled solvent vapor atmospheres on the alignment of ZnO nanorods within a matrix of semiconducting polymer will be studied in-situ on interdigitated nanoelectrode arrays. In a second approach, highly ordered 2 arrays of ZnO and polymer nanorods will be prepared by block copolymer self assembly and sol-vent-aided nanoimprint lithography, respectively. These templates will subsequently be infiltrated with the complementary component. Novel solar cell design principles and variation of electrode materials will be used to engineer the semiconductor/electrode interfaces. The influence of ordered morphologies on the transport of charge carriers and the overall device performance will be eluci-dated with various characterization methods. Optical and electrical modelling of solar cells shall provide deeper insight in the device physics and evaluate the optimization potential of different morphologies.