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Understanding the Impact of Oligomeric Polystyrene Side Chain Arrangement on the All‐Polymer Solar Cell Performance
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2017-09-14 , DOI: 10.1002/aenm.201701552 Tadanori Kurosawa 1 , Xiaodan Gu 1, 2 , Kevin L. Gu 1, 2 , Yan Zhou 1 , Hongping Yan 2 , Cheng Wang 3 , Ging-Ji Nathan Wang 1 , Michael F. Toney 2 , Zhenan Bao 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2017-09-14 , DOI: 10.1002/aenm.201701552 Tadanori Kurosawa 1 , Xiaodan Gu 1, 2 , Kevin L. Gu 1, 2 , Yan Zhou 1 , Hongping Yan 2 , Cheng Wang 3 , Ging-Ji Nathan Wang 1 , Michael F. Toney 2 , Zhenan Bao 1
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The introduction of oligomeric polystyrene (PS) side chains into the conjugated backbone is proven to enhance the processability and electronic properties of semiconducting polymers. Here, two series of donor and acceptor polymers are prepared with different molar percentages of PS side chains to elucidate the effect of their substitution arrangement on the all‐polymer solar cell performance. The observed device performance is lower when the PS side chains are substituted on the donor polymer and higher when on the acceptor polymer, indicating a clear arrangement effect of the PS side chain. The incorporation of PS side chains to the acceptor polymer contributes to the decrease in phase separation domain size in the blend films. However, the reduced domain size was still an order of magnitude larger than the typical exciton diffusion length. A detailed morphological study together with the estimation of solubility parameter of the pristine PS, donor, and acceptor polymers reveals that the relative value of solubility parameter of each component dominantly contributes to the purity of the phase separated domain, which strongly impacts the amount of generated photocurrent and overall solar cell performance. This study provides an understanding of the design strategies to improve the all‐polymer solar cells.
中文翻译：
了解低聚聚苯乙烯侧链排列对全聚合物太阳能电池性能的影响
已证明将低聚聚苯乙烯（PS）侧链引入共轭骨架可增强半导体聚合物的可加工性和电子性能。在这里，准备了两个不同摩尔百分比的PS侧链的供体和受体聚合物，以阐明它们的取代排列对全聚合物太阳能电池性能的影响。当PS侧链被取代在给体聚合物上时，观察到的器件性能较低，而当受体侧被取代时，所观察到的器件性能较高，表明PS侧链具有明显的排列效果。PS侧链结合到受体聚合物中有助于减小共混膜中的相分离域尺寸。但是，减小的畴尺寸仍比典型的激子扩散长度大一个数量级。详细的形态学研究以及对原始PS，供体和受体聚合物的溶解度参数的估计表明，每种组分的溶解度参数的相对值主要影响相分离域的纯度，这极大地影响了生成量。光电流和整体太阳能电池性能。这项研究提供了对改进全聚合物太阳能电池设计策略的理解。
更新日期：2017-09-14
中文翻译：
了解低聚聚苯乙烯侧链排列对全聚合物太阳能电池性能的影响
已证明将低聚聚苯乙烯（PS）侧链引入共轭骨架可增强半导体聚合物的可加工性和电子性能。在这里，准备了两个不同摩尔百分比的PS侧链的供体和受体聚合物，以阐明它们的取代排列对全聚合物太阳能电池性能的影响。当PS侧链被取代在给体聚合物上时，观察到的器件性能较低，而当受体侧被取代时，所观察到的器件性能较高，表明PS侧链具有明显的排列效果。PS侧链结合到受体聚合物中有助于减小共混膜中的相分离域尺寸。但是，减小的畴尺寸仍比典型的激子扩散长度大一个数量级。详细的形态学研究以及对原始PS，供体和受体聚合物的溶解度参数的估计表明，每种组分的溶解度参数的相对值主要影响相分离域的纯度，这极大地影响了生成量。光电流和整体太阳能电池性能。这项研究提供了对改进全聚合物太阳能电池设计策略的理解。
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