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Jing Gao, Wei Chen, Letian Dou, Chun-Chao Chen, Wei-Hsuan Chang, Yongsheng Liu, Gang Li and Yang Yang Elucidating Double Aggregation Mechanisms in the Morphology Optimization of Diketopyrrolopyrrole-Based Narrow Bandgap Polymer Solar Cells Advanced Materials 26

Article first published online: 11 FEB 2014 | DOI: 10.1002/adma.201305645

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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.

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