Understanding the Effect of Unintentional Doping on Transport Optimization and Analysis in Efficient Organic Bulk-Heterojunction Solar Cells
Understanding the Effect of Unintentional Doping on Transport Optimization and Analysis in Efficient Organic Bulk-Heterojunction Solar Cells
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DOI：
10.1103/physrevx.5.011032
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发表时间：
2015-03-24
影响因子：
12.5
通讯作者：
Durrant, James R.
中科院分区：
文献类型：
--
作者：
Deledalle, Florent;Kirchartz, Thomas;Durrant, James R.
在本文中，我们提供了无意p型掺杂对体异质结太阳能电池性能和表观复合动力学影响的实验证据。通过对两批具有不同掺杂水平和不同厚度的相同效率的聚合物富勒烯太阳能电池进行漂移扩散模拟来支持这些实验观察，我们研究了掺杂的存在如何影响有机太阳能电池中重组和电荷输运的光电测量解释。我们还提出了无意掺杂如何导致过高的表观反应阶数的实验证据。我们的工作首先表明，掺杂水平的知识在重组动力学和载流子输运的研究中是必不可少的，并且无意掺杂水平需要降低到大约7 x 10(15) cm（-3）以下，以充分优化高效聚合物-富勒烯太阳能电池的第二次干扰最大。
In this paper, we provide experimental evidence of the effects of unintentional p-type doping on the performance and the apparent recombination dynamics of bulk-heterojunction solar cells. By supporting these experimental observations with drift-diffusion simulations on two batches of the same efficient polymer-fullerene solar cells with substantially different doping levels and at different thicknesses, we investigate the way the presence of doping affects the interpretation of optoelectronic measurements of recombination and charge transport in organic solar cells. We also present experimental evidence on how unintentional doping can lead to excessively high apparent reaction orders. Our work suggests first that the knowledge of the level of dopants is essential in the studies of recombination dynamics and carrier transport and that unintentional doping levels need to be reduced below approximately 7 x 10(15) cm(-3) for full optimization around the second interference maximum of highly efficient polymer-fullerene solar cells.