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Impact of Alkyl Chain Length on Small Molecule Crystallization and Nanomorphology in Squaraine-Based Solution Processed Solar Cells
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-04-05 00:00:00 , DOI: 10.1021/acs.jpcc.7b01339 Chenyu Zheng , Ishita Jalan , Patrick Cost , Kyle Oliver , Anju Gupta , Scott Misture 1 , Jeremy A. Cody , Christopher J. Collison
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-04-05 00:00:00 , DOI: 10.1021/acs.jpcc.7b01339 Chenyu Zheng , Ishita Jalan , Patrick Cost , Kyle Oliver , Anju Gupta , Scott Misture 1 , Jeremy A. Cody , Christopher J. Collison
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In this work, we have investigated a series of aniline-based squaraines, with varying solubilizing alkyl chains, as donor materials in bulk heterojunction (BHJ) solar cells. Although these squaraine molecules exhibit similar absorbance spectra and crystal structures, the difference in properties that drive the OPV performance becomes apparent when each squaraine is blended with PCBM. Thin film X-ray diffraction results demonstrate a disruption of squaraine crystallization in the presence of PCBM, more so for shorter side chain squaraines. As a result, the hole mobilities of BHJ films of shorter side chain squaraines show the largest drop when compared to their neat films, whereas the mobility decrease for the longer side chain counterparts is small. However, morphological studies have shown that the phase separation rapidly happens during the spin-casting process for longer side chain squaraines. Ultimately, it is the extent of phase separation that dominates the final device efficiency. Therefore, rational design can greatly be influenced as a result of our systematic materials properties overview for anilinic squaraines targeted for OPV.
中文翻译：
烷基链长对基于方胺基固溶处理的太阳能电池中小分子结晶和纳米形态的影响
在这项工作中，我们研究了一系列具有不同溶解性烷基链的苯胺基方胺，作为本体异质结（BHJ）太阳能电池中的供体材料。尽管这些方酸分子显示出相似的吸收光谱和晶体结构，但是当每个方酸与PCBM混合时，驱动OPV性能的特性差异会变得很明显。薄膜X射线衍射结果表明，在存在PCBM的情况下，方酸晶体的破坏，对于较短的侧链方晶更是如此。结果，与纯膜相比，短侧链方晶BHJ薄膜的空穴迁移率下降最大，而长侧链方晶BHJ薄膜的迁移率下降很小。然而，形态学研究表明，对于较长的侧链方晶，自旋铸造过程中会快速发生相分离。最终，相分离的程度决定了最终器件的效率。因此，由于我们针对OPV的无方型方管的系统材料属性概述，合理的设计可能会受到很大的影响。
更新日期：2017-04-05
中文翻译：
烷基链长对基于方胺基固溶处理的太阳能电池中小分子结晶和纳米形态的影响
在这项工作中，我们研究了一系列具有不同溶解性烷基链的苯胺基方胺，作为本体异质结（BHJ）太阳能电池中的供体材料。尽管这些方酸分子显示出相似的吸收光谱和晶体结构，但是当每个方酸与PCBM混合时，驱动OPV性能的特性差异会变得很明显。薄膜X射线衍射结果表明，在存在PCBM的情况下，方酸晶体的破坏，对于较短的侧链方晶更是如此。结果，与纯膜相比，短侧链方晶BHJ薄膜的空穴迁移率下降最大，而长侧链方晶BHJ薄膜的迁移率下降很小。然而，形态学研究表明，对于较长的侧链方晶，自旋铸造过程中会快速发生相分离。最终，相分离的程度决定了最终器件的效率。因此，由于我们针对OPV的无方型方管的系统材料属性概述，合理的设计可能会受到很大的影响。
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