According to foreign media reports, perovskite is quickly becoming the leader of high-efficiency solar cells, but it has a very obvious problem-too fragile. Now, a team of engineers from Purdue University has discovered that this material can be stabilized by adding a large molecule so that it can be stacked into layers and play a role in solar cells and other electronic products.
Traditional solar cells are made of silicon in the active layer. After decades of improvements, the efficiency of these devices has reached more than 20%. The perovskite solar cell reached the same level in just 10 years. When silicon and perovskite are used together, their efficiency can be as high as 27.7%.
In addition, the perovskite has the advantage that this material is easier and cheaper to mass produce, and it is very thin to print or spray onto the surface.
But in fact, there is a trap here-perovskite is notoriously unstable, so it is easily affected by various elements-considering that solar cells are exposed to sunlight and rain all day, this is obviously not a What good news-and it doesn't stack well.
In this new study, the researchers discovered a fairly simple method to make it more stable. They added a rigid macromolecule called bithiophenylethylammonium to the surface of perovskite. The research team pointed out that in this way, the movement of ions is stabilized, which can prevent the chemical bond of this material from breaking too easily or mixing with other layers of perovskite materials.
Brett Savoie, one of the authors of the study, said: "If an engineer wants to combine the best part of perovskite A with the best part of perovskite B, it is usually impossible because perovskite only Mix together. In this case, you can really make the most of A and B in one material. And this is completely unheard of. "
In addition, the research team also found that by adding this molecule, the perovskite can be kept stable up to 100 ° C. This is very important for things that require direct exposure to sunlight and can also be used in electronic devices.
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