Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 39, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102000
Keywords
aggregation; cold-aging; organic solar cells; power conversion efficiency
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Funding
- National Natural Science Foundation of China [52073221, 21774097]
- Fundamental Research Funds for the Central Universities [WUT: 2021III016JC]
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The cold-aging strategy can mediate the pre-aggregation of PM6 polymer in solution through a disorder-order transition, resulting in dense and fine PM6 aggregates with enhanced pi-pi stacking in blend films with non-fullerene acceptors. This approach improves charge mobility and leads to enhanced power conversion efficiency in organic solar cells.
The molecular ordering and pre-aggregation of photovoltaic materials in solution can significantly affect the nanoscale morphology in solid photoactive layers, and play a vital role in determining the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, a cold-aging strategy is reported to mediate the pre-aggregation of PM6 polymer in solution through a disorder-order transition, which leads to dense and fine PM6 aggregates with enhanced pi-pi stacking in its blend thin films with either fused-ring and non-fused-ring non-fullerene acceptors (NFAs) including Y6-BO, N3, IT-4F, and PTIC. The fine aggregates of PM6 and slightly enlarged NFA domains improve the continuous networks with enhanced and balanced charge mobility. The resulting OSCs all demonstrate enhanced PCEs compared to their counterparts without any cold-aging treatments, with PM6:Y6-BO OSC being most effective from 16.6% to 17.7%, demonstrating the universality of this approach. This can be further optimized upon casting of the cold-aging solution with the presence of solvent vapor, resulting in a champion PCE of 18.0% for PM6:Y6-BO OSC, which is the highest PCE of this OSC reported in the literature. This work provides a rational guide for optimizing non-fullerene OSCs via aggregation control before and during the solution casting process.
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