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Lithium‐Ion Endohedral Fullerene (Li+@C60) Dopants in Stable Perovskite Solar Cells Induce Instant Doping and Anti‐Oxidation |
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| 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 |
| Affiliation: | 1. Department of Mechanical Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan;2. School of Chemistry, Northeast Normal University, Jilin, P. R. China;3. ?ngstr?m Laboratory Physical Chemistry, Uppsala University, Uppsala, Sweden;4. Department of Applied Chemistry, Osaka University, Osaka, Japan;5. Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan |
| 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. |
| Keywords: | air stability doping fullerenes lithium perovskite solar cells |