Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA.
J Chem Phys. 2010 Aug 21;133(7):074902. doi: 10.1063/1.3471583.
Due to low charge carrier mobilities in polymer-based solar cells, device performance is dictated by the nanoscale morphology of the active layer components. However, their morphological details are notoriously difficult to distinguish due to the low electron contrast difference between the components. Phase-sensitive neutron reflectivity (PSNR) is uniquely suited to characterize these systems due to the large, natural scattering length density difference between two common device materials, poly(3-hexylthiophene) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Using PSNR we find a high concentration of PCBM at the substrate and near but not at the air interface. Herein we discuss the method of applying PSNR to polymer-based solar cells, the results obtained, and an evaluation of its effectiveness.
由于聚合物基太阳能电池中的电荷载流子迁移率较低，因此器件性能取决于活性层组件的纳米级形态。然而，由于组件之间的电子对比度差异很小，因此其形态细节很难区分。相敏中子反射率（PSNR）非常适合表征这些系统，因为两种常见器件材料聚（3-己基噻吩）和[6,6]-苯基-C61-丁酸甲酯（PCBM）之间存在较大的天然散射长度密度差。使用 PSNR，我们发现 PCBM 在衬底附近和靠近衬底的位置浓度较高，但在空气界面附近则没有。本文讨论了将 PSNR 应用于聚合物基太阳能电池的方法、获得的结果以及对其有效性的评估。
