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Lithium‐Ion Endohedral Fullerene (Li + @C 60 ) Dopants in Stable Perovskite Solar Cells Induce Instant Doping and Anti‐Oxidation
Author(s) -
Jeon Il,
Ueno Hiroshi,
Seo Seungju,
Aitola Kerttu,
Nishikubo Ryosuke,
Saeki Akinori,
Okada Hiroshi,
Boschloo Gerrit,
Maruyama Shigeo,
Matsuo Yutaka
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201800816
Subject(s) - dopant , fullerene , perovskite (structure) , glovebox , halide , doping , lithium (medication) , oxygen , materials science , inorganic chemistry , chemical engineering , chemistry , organic chemistry , optoelectronics , medicine , endocrinology , engineering
Herein, we report use of [Li + @C 60 ]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 + @C 60 ]TFSI − repelling moisture and absorbing intruding oxygen, thereby protecting the perovskite device from degradation. Furthermore, [Li + @C 60 ]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.