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- Title
Optimized active layer morphology toward efficient and polymer batch insensitive organic solar cells.
- Authors
Weng, Kangkang; Ye, Linglong; Zhu, Lei; Xu, Jinqiu; Zhou, Jiajia; Feng, Xiang; Lu, Guanghao; Tan, Songting; Liu, Feng; Sun, Yanming
- Abstract
Morphology control in laboratory and industry setting remains as a major challenge for organic solar cells (OSCs) due to the difference in film-drying kinetics between spin coating and the printing process. A two-step sequential deposition method is developed to control the active layer morphology. A conjugated polymer that self-assembles into a well-defined fibril structure is used as the first layer, and then a non-fullerene acceptor is introduced into the fibril mesh as the second layer to form an optimal morphology. A benefit of the combined fibril network morphology and non-fullerene acceptor properties was that a high efficiency of 16.5% (certified as 16.1%) was achieved. The preformed fibril network layer and the sequentially deposited non-fullerene acceptor form a robust morphology that is insensitive to the polymer batches, solving a notorious issue in OSCs. Such progress demonstrates that the utilization of polymer fibril networks in a sequential deposition process is a promising approach towards the fabrication of high-efficiency OSCs. Reliably controlling the morphology in organic solar cells is desired for up-scaling. Here Weng et al. combine the advantages of the fibril network donor and the state of the art Y6 acceptor in a two-step approach to deliver a high efficiency of 16% without batch-to-batch variation.
- Subjects
SOLAR cells; FULLERENE polymers; CONJUGATED polymers; SPIN coating; POLYMER networks; MORPHOLOGY; PHOTOVOLTAIC cells; DYE-sensitized solar cells
- Publication
Nature Communications, 2020, Vol 11, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-020-16621-x