Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
Adv Mater. 2014 May 21;26(19):3142-7. doi: 10.1002/adma.201305645. Epub 2014 Feb 11.
The power conversion efficiency (PCE) of a DPP-based polymer solar cell is significantly improved by using DIO or DCB as processing additives. The discovery that DCB outperforms DIO with a significantly wider solvent mixture operation window suggests different optimization mechanisms. Although both solvent mixture systems involve double aggregation processes, including a similar solution-to-film aggregation, however, two distinct solution-stage aggregations are observed: relatively amorphous polymer aggregates form in the CF-DIO solution, while more crystalline polymer aggregates form in CF-DCB solution.
使用 DIO 或 DCB 作为加工添加剂可显著提高基于 DPP 的聚合物太阳能电池的功率转换效率 (PCE)。发现 DCB 的性能优于 DIO，且具有明显更宽的溶剂混合操作窗口，这表明存在不同的优化机制。尽管这两种溶剂混合体系都涉及双重聚集过程，包括相似的溶液-薄膜聚集过程，但在两个不同的溶液阶段都观察到了聚集：在 CF-DIO 溶液中形成相对无定形的聚合物聚集，而在 CF-DCB 溶液中形成更结晶的聚合物聚集。
