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Modifying perovskite solar cells with (+)-cysteine at the interface between mesoporous TiO and perovskite
Perovskite solar cells (PSCs) have attracted extensive attention and their which power conversion efficiency (PCE) has rapidly increased from 3.8% to 25.2% in recent years. Interfacial modification is regarded as a highly effective strategy to address the humidity instability and improve the perform...
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Published in: | Sustainable energy & fuels 2020-02, Vol.4 (2), p.878-883 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Online Access: | Get full text |
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Summary: | Perovskite solar cells (PSCs) have attracted extensive attention and their which power conversion efficiency (PCE) has rapidly increased from 3.8% to 25.2% in recent years. Interfacial modification is regarded as a highly effective strategy to address the humidity instability and improve the performance of PSCs. In this regard,
l
(+)-cysteine (
l
-cy), a typical trifunctional amino acid, is employed to modify the interface between mesoporous TiO
2
(mp-TiO
2
) and perovskite. The incorporation of
l
-cy increases the PCE from 11.5% to 14.4%. Fluorescence measurements show that the electron injection from perovskite to mp-TiO
2
is enhanced due to the interactions between the functional groups (-COOH, -NH
2
and -SH) of
l
-cy and Ti
4+
ions in mp-TiO
2
and unsaturated Pb
2+
and I
−
ions in the perovskite film. This work demonstrates a facile and effective method to achieve high-performance PSCs.
A typical trifunctional amino acid,
l
(+)-cysteine, is employed to modify the interface between mesoporous TiO
2
and perovskite film, and promotes the power conversion efficiency of perovskite solar cells from 11.5% to 14.4%. |
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ISSN: | 2398-4902 |
DOI: | 10.1039/c9se00963a |