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

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...

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Veröffentlicht in:Angewandte Chemie International Edition 2018-04, Vol.57 (17), p.4607-4611
Hauptverfasser: Jeon, Il, Ueno, Hiroshi, Seo, Seungju, Aitola, Kerttu, Nishikubo, Ryosuke, Saeki, Akinori, Okada, Hiroshi, Boschloo, Gerrit, Maruyama, Shigeo, Matsuo, Yutaka
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Sprache:eng
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Zusammenfassung: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. Air stability remains the most challenging limitation to commercialization of perovskite solar cells. Use of conventional Li+TFSI− dopants leads to instability because of its hygroscopic nature. Using a fullerene‐encapsulated Li+@C60 TFSI− dopant gives a 10‐fold enhancement of the air‐stability of perovskite solar cells, through the dopant's hydrophobic nature, instant oxidation of spiro‐MeOTAD, and anti‐oxidation activity.
ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.201800816