Steric hindrance driven passivating cations for stable perovskite solar cells with an efficiency over 24

In this work, a series of passivating salts for perovskite solar cells (PSCs) based on ortho -methylammonium iodide functional units are molecularly engineered to study the steric hindrance driven passivation effect. The incorporation of fluorine atoms into passivating agents has been found to be be...

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Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 12; no. 3; pp. 1422 - 1428
Main Authors Rakstys, Kasparas, Xia, Jianxing, Zhang, Yi, Siksnelyte, Kotryna, Slonopas, Andre, Dyson, Paul J, Getautis, Vytautas, Nazeeruddin, Mohammad Khaja
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 16.01.2024
Subjects
Cations
Charge transport
Energy conversion efficiency
Fluorine
Hydrophobicity
Iodides
Passivity
Perovskites
Photovoltaic cells
Solar cells
Stability
Steric hindrance
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Summary:In this work, a series of passivating salts for perovskite solar cells (PSCs) based on ortho -methylammonium iodide functional units are molecularly engineered to study the steric hindrance driven passivation effect. The incorporation of fluorine atoms into passivating agents has been found to be beneficial not only for maximized defect passivation effect, ensuring improved charge transport, but also for significantly enhanced hydrophobicity of the perovskite film, leading to enhanced device stability. The highest power conversion efficiency (PCE) of over 24% has been achieved for surficial passivated PSCs based on fluorinated cation PFPDMAI 2 . Importantly, long-term operational stability over 1500 h is demonstrated showing the great prospect of a simple passivation strategy forming a thin organic halide salt layer instead of a 2D perovskite layer on the surface. Surficial passivated PSCs with power conversion efficiency over 24% have been achieved based on perfluorinated cation PFPDMAI 2 having sterically hindered ortho -methylammonium iodide functional units with a long-term operational stability over 1500 h.
Bibliography:https://doi.org/10.1039/d3ta03423b
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curves, fitting parameters of bi-exponential decay function in TRPL. See DOI
Electronic supplementary information (ESI) available: Detailed synthetic procedures, device fabrication and characterization, SEM and XRD data, detailed photovoltaic parameters along with
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ISSN:2050-7488
2050-7496
DOI:10.1039/d3ta03423b