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 |
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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. |
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ISSN: | 1433-7851 1521-3773 1521-3773 |
DOI: | 10.1002/anie.201800816 |