Efficient and Stable Inverted Perovskite Solar Cells with TOASiW12‐Modified Al as a Cathode

Inexpensive metal Al is scarcely utilized as the cathode in the perovskite solar cells (PVSCs) because its violent reaction with perovskite active layer results in poor device stability in air. It is urgent to improve the efficiency and stability of PVSCs with Al as the cathode for mass production o...

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Bibliographic Details
Published in:Advanced functional materials 2023-02, Vol.33 (7), p.n/a
Main Authors: Yu, Chengzhuo, Hu, Yun, Yang, Jialin, Huang, Jingsong, Li, Bao, Wu, Lixin, Li, Fenghong
Format: Article
Language:English
Subjects:
air stability
Aluminum
cathode interlayers
Cathodes
Chemical reactions
Energy conversion efficiency
Interlayers
Mass production
Materials science
perovskite solar cells
Perovskites
Photovoltaic cells
Polyoxometallates
Relative humidity
Solar cells
Stability
TOASiW12‐modified Al
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Summary:Inexpensive metal Al is scarcely utilized as the cathode in the perovskite solar cells (PVSCs) because its violent reaction with perovskite active layer results in poor device stability in air. It is urgent to improve the efficiency and stability of PVSCs with Al as the cathode for mass production of low‐cost PVSCs. Herein, a novel solution‐processed cathode interlayer material, surfactant‐encapsulated polyoxometalate complex [(C8H17)4N]4[SiW12O40] (TOASiW12) is reported. Using TOASiW12‐modified Al as the cathode, the power conversion efficiency (PCE) of 20.64% has been achieved in the inverted PVSCs. The findings demonstrate that a thin TOASiW12 layer can effectively obstruct the chemical reaction between Al and perovskite layer, and significantly enhance the device stability. The unencapsulated devices with TOASiW12‐modified Al retain more than 80% of the initial PCE after 350 h storage in the ambient atmosphere at 45% relative humidity. This study provides an excellent alternative cathode interlayer material for efficient and stable inverted PVSCs. Inverted perovskite solar cells with [(C8H17)4N]4[SiW12O40] (TOASiW12)‐modified Al as the cathode present not only the power conversion efficiency of 20.64% but also good air stability because TOASiW12 suppresses Al corrosion and perovskite decomposition by blocking the moisture into the perovskite and catching mobile Al atoms to form AlOx and prevent the Al atoms invading the perovskite.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202209290