Organic solar cells are known for their high efficiency and minimal environmental impact, yet large-scale production has long been a challenge. Now, a research team at Lund University in Sweden has developed a novel design principle that makes this challenge achievable. Published in the journal Nature Energy, the study delves into the molecular shapes and interactions of organic solar cells in detail.
The efficiency of organic solar cells is steadily catching up with that of traditional solar cells, now able to convert approximately 20% of sunlight into electricity. This high efficiency is the result of years of in-depth research into materials and their molecular interactions, known as morphology.
Organic solar cells are typically produced through physical blends, which are then coated onto substrates and allowed to dry as the solvents evaporate. However, traditional chemical solutions often contain toxic and environmentally harmful substances. The research team at Lund University, collaborating with peers in China and the United States, successfully tackled the technological challenge of producing high-efficiency organic solar cells using eco-friendly solvents.
By utilizing advanced synchrotron X-ray and neutron techniques, the team mapped out the interactions between electron transport materials and solvent molecules. Through these studies, the team developed design principles applicable to a variety of environmentally friendly solvents. They even envision a future where water could be used as a solvent.
Researchers note that understanding the correlation between the morphology and performance of organic solar cells is a significant challenge. This involves studying ultra-fast charge transfer processes from material release to material reception, occurring at the nanoscale structures and molecular interfaces. The research team suggests that the gateway to large-scale production of environmentally sustainable organic solar cells has been opened.
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