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

Il Jeon; Hiroshi Ueno; Seungju Seo; Kerttu Aitola; Ryosuke Nishikubo; Akinori Saeki; Hiroshi Okada; Gerrit Boschloo; Shigeo Maruyama; Yutaka Matsuo

doi:10.1002/anie.201800816

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

Angew Chem Int Ed Engl. 2018 Apr 16;57(17):4607-4611. doi: 10.1002/anie.201800816. Epub 2018 Mar 13.

Authors

Il Jeon¹, Hiroshi Ueno², Seungju Seo¹, Kerttu Aitola³, Ryosuke Nishikubo⁴, Akinori Saeki⁴, Hiroshi Okada¹, Gerrit Boschloo³, Shigeo Maruyama^{1

5}, Yutaka Matsuo^{1

2}

Affiliations

¹ Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
² School of Chemistry, Northeast Normal University, Changchun, Jilin, 130024, P. R. China.
³ Ångström Laboratory Physical Chemistry, Uppsala University, 75120, Uppsala, Sweden.
⁴ Department of Applied Chemistry, Osaka University, Osaka, 565-0871, Japan.
⁵ Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8564, Japan.

PMID: 29534325
DOI: 10.1002/anie.201800816

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.

Publication types

Research Support, Non-U.S. Gov't