Lithium-Ion Endohedral Fullerene (Li+@C60) Dopants in Stable Perovskite Solar Cells Induce Anti-Oxidation

Authors

Dr. Il Jeon,Dr. Hiroshi Ueno,Seungju Seo,Dr. Kerttu Aitola,Ryosuke Nishikubo,Prof. Akinori Saeki,Dr. Hiroshi Okada,Prof. Gerrit Boschloo,Prof. Shigeo Maruyama,Prof. Yutaka Matsuo

Abstract

Herein, we report use of [Li⁺@C₆₀]TFSI⁻ as a dopant for spiro-MeOTAD in lead halide perovskite solar cells. This approach gave an air stability nearly 10-fold that of conventional devices using Li⁺TFSI⁻. Such high stability is attributed to the hydrophobic nature of [Li⁺@C₆₀]TFSI⁻ repelling moisture and absorbing intruding oxygen, thereby protecting the perovskite device from degradation. Furthermore, [Li⁺@C₆₀]TFSI⁻ could oxidize spiro-MeOTAD without the need for oxygen. The encapsulated devices exhibited outstanding air stability for more than 1000 h while illuminated under ambient conditions.

Wiley Online Library / Angewandte Chemie International Edition : http://onlinelibrary.wiley.com/doi/10.1002/anie.201800816/abstract