2022 Energy Environ. Sci., Shear Impulse Approach for the Preparation of High-Performance and Scalable Organic Solar Cells in Green Solvents
- In this research, the shear impulse strategy is used to fine-tune the morphology of non-halogenated solvent treated active layer films, and the critical conditions for homogenizing printing organic solar cells (OSCs) are explored with universal applicability.
- The changes in the morphology of the active layer thin films were explained by calculating the magnitude of the shear impulse, and the relationship between the magnitude of the shear impulse, morphology and photoelectric properties is established.
- Through the qualitative analysis of the shear impulse, the critical conditions for preparing large-area film homogenization are determined.
- 25cm2 photoelectric module efficiency reaches 11.29%.
In recent years, green solvent-treated OSCs have shown significant advantages in printing large-area photovoltaic devices. However, the high boiling point and poor solubility of green solvents lead to difficulties in morphological exploration and regulation, which are ultimately prejudiced against the upgrading of large-area OSCs. In this work, the shear-pulsing strategy is used to prepare high-performance scalable OSCs with green solvents. In PM6:Y6 films treated with o-XY, the shear pulse during film formation is improved by increasing the speed of the meniscus-guided coating (MGC) to achieve proper phase separation.
With the increase of the coating speed (shear impulse), the photoelectric conversion efficiency (PCE) and external quantum efficiency (EQE) were significantly improved. The same goes for the uniformity of the film. In addition, the large-area organic solar cell module prepared by this strategy has a PCE of 11.29%.
Keywords: shear impulse strategy, green solvent, organic solar cell, Solar Simulator, Sun Simulator, Quantum Efficiency
Article link: https://doi.org/10.1039/D2EE00639A