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Enhancing the stability of perovskite solar cells

By Paul Grad |

Perovskite solar cells have attracted much interest in the past few years as the next-generation solar cells capable of surpassing silicon cells’ efficiency. However, because the perovskite materials are easily decomposed in moist conditions, they must be properly encapsulated, which results in low stability. To overcome those limitations and speed up the commercialization of perovskite solar cells, professor Jin Young Kim from the School of Energy and Chemical Engineering at Ulsan National Institute of Science and Technology (UNIST, Ulsan, South Korea; www.unist.ac.kr) and associates from Wonkwang University (Iksan) and the Korea Institute of Energy Research (KIER; Ulsan, both South Korea) have used fluorine-functionalized graphene nanoplatelets (EFGnPs-F) with a p-i-n structure of perovskite solar cells to fully cover the perovskite active layer and protect against water ingress. The cells achieved 82% stability relative to initial performance over 30 days of air exposure without encapsulation. The enhanced stability resulted from fluorine-substitution on EFGnPs. “By substituting carbon for fluorine, we have created a two-dimensional material with high hydrophobicity, like Teflon, and then applied it to perovskite solar cells,”…
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