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

该项目是一个跨学科的方法，结合化学和界面科学（路德维希）和设备工程（Würfel），研究高度有序的纳米结构在半导体聚合物/无机混合太阳能电池的影响。以噻吩基聚合物和纳米ZnO为模型体系。具有激子扩散长度尺度的尺寸的高度交叉的供体/受体网络将被定制以实现供体和受体之间的高界面面积和电荷载流子到电极的传输路径长度的最小化。在第一种方法中，电场和受控溶剂蒸气气氛对半导体聚合物基质内ZnO纳米棒的排列的影响将在叉指型纳米电极阵列上原位研究。在第二种方法中，高度有序的2阵列的ZnO和聚合物纳米棒将分别通过嵌段共聚物自组装和溶剂辅助的纳米压印光刻制备。这些模板随后将被渗透补充组件。新颖的太阳能电池设计原理和电极材料的变化将用于设计半导体/电极界面。有序形态对载流子输运和整体器件性能的影响将通过各种表征方法阐明。太阳能电池的光学和电学建模将提供更深入的器件物理学见解，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.