The effect of three-dimensional morphology on the efficiency of hybrid polymer solar cells
The effect of three-dimensional morphology on the efficiency of hybrid polymer solar cells
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DOI：
10.1038/nmat2533
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发表时间：
2009-10-01
期刊：
影响因子：
41.2
通讯作者：
Janssen, Rene A. J.
中科院分区：
文献类型：
--
作者：
Oosterhout, Stefan D.;Wienk, Martijn M.;Janssen, Rene A. J.
聚合物太阳能电池的效率主要取决于这些器件中用于产生电荷的供体和受体半导体的混合程度，以及各个组件中传输空穴和电子的不受阻碍的渗滤路径的存在。这些本体异质结形态的三维可视化一直具有挑战性，并阻碍了该领域的进展。在这里，我们通过电子断层扫描在纳米范围内空间解析了由聚（3-己基噻吩）作为供体和 ZnO 作为受体组成的 2% 效率混合太阳能电池的形态。对球形接触距离和渗滤路径的形态进行统计分析。结合求解三维激子扩散方程，对于具有不同层厚度的器件，获得了太阳能电池性能、光物理数据和三维形态之间一致且定量的相关性，从而能够区分生成和传输作为性能的限制因素。
The efficiency of polymer solar cells critically depends on the intimacy of mixing of the donor and acceptor semiconductors used in these devices to create charges and on the presence of unhindered percolation pathways in the individual components to transport holes and electrons. The visualization of these bulk heterojunction morphologies in three dimensions has been challenging and has hampered progress in this area. Here, we spatially resolve the morphology of 2%-efficient hybrid solar cells consisting of poly(3-hexylthiophene) as the donor and ZnO as the acceptor in the nanometre range by electron tomography. The morphology is statistically analysed for spherical contact distance and percolation pathways. Together with solving the three-dimensional exciton-diffusion equation, a consistent and quantitative correlation between solar-cell performance, photophysical data and the three-dimensional morphology has been obtained for devices with different layer thicknesses that enables differentiating between generation and transport as limiting factors to performance.