A collaborative research team from Seoul City University, Chungnam National University, and Gunsan National University has published a paper in the prestigious journal Advanced Functional Materials, focusing on the stabilization of perovskite solar cells (PSC). Despite their potential for high photovoltaic efficiency exceeding 26%, traditional PSC production relied heavily on toxic solvents and controlled environments with humidity below 30%. This dependence has hindered large-scale manufacturing and commercial application of these promising solar cells.

In response to the limitations posed by existing materials, the researchers explored the use of eco-friendly solvents like ethyl acetate. However, the high volatility of ethyl acetate results in irregular crystallization, leading to the formation of defects and pinholes in the films, ultimately reducing device efficiency and stability. To counter this, the team designed two ionic liquids with adjustable ring sizes, which they added to the ethyl acetate solvent. This innovative approach enabled the successful production of high-quality perovskite thin films even under atmospheric conditions of relative humidity below 50%.

The findings indicate that the smaller cations formed ultra-thin two-dimensional layers, enhancing the orientation of perovskite crystals. This advancement not only addresses the ecological concerns surrounding toxic solvents but also opens the doors for more resilient solar cell technologies. By integrating these new solutions into the production process, they hope to pave the way for the commercialization of perovskite solar cells, reflecting a significant leap towards greener and more sustainable energy solutions in the photovoltaic industry.