A Triethyleneglycol C60 Mono-adduct Derivative for Efficient Electron Transport in Inverted Perovskite Solar Cells

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Chinese Journal of Chemistry. Wiley. 2023, 41(4), pp. 431-442. ISSN 1001-604X. eISSN 1614-7065. Available under: doi: 10.1002/cjoc.202200542
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Inverted perovskite solar cells (PSCs) have attracted increasing attention in recent years owing to their low-temperature fabrication proces s. However, they suffer from a limited number of electron transport materials available with [6,6]-phenyl C61 butyric acid methyl ester (PCBM) to be the most widely studied based on its appropriate energy levels and high electron mobility. The low relative permittivity and aggregation tendency upon illumination of PCBM, however, compromises the solar cell efficiency whereas its modest hydrophobicity negatively impacts on the device stability. Alternative electron transport materials with desired properties and appropriate degree of hydrophobicity are thus desirable for further developments in inverted PSCs. Herein, we synthesize a triethyleneglycol C60 mono-adduct derivative (termed as EPF03) and test it as a novel electron transport material to replace PCBM in inverted PSCs based on a quadruple cation (RbCsMAFA) perovskite. We also compare this derivative with two novel fullerenes decorated with two (EPF01) or one dodecyl (EPF02) long side chains. The latter two fail to perform efficiently in inverted PSCs whereas the former enabled a power conversion efficiency of 18.43%, which represents a 9% improvement compared to the reference device using PCBM (17.21%). The enhanced performance mainly stems from improved electron extraction and reduced recombination enabled by the insertion of the large relative permittivity amongst other properties of EPF03. Furthermore, our results indicate that triethylene glycol side chains can also passivate perovskite trap states, suppress ion migration and enhance photostability and long-term stability of EPF03 based perovskite solar cells.

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ISO 690FAKHARUDDIN, Azhar, Konstantina‐Kalliopi ARMADOROU, Leandros P. ZORBA, Marinos TOUNTAS, Tobias SEEWALD, Emilia R. SCHÜTZ, Lukas SCHMIDT-MENDE, Georgios C. VOUGIOUKALAKIS, Mohammad Khaja NAZEERUDDIN, Maria VASILOPOULOU, 2023. A Triethyleneglycol C60 Mono-adduct Derivative for Efficient Electron Transport in Inverted Perovskite Solar Cells. In: Chinese Journal of Chemistry. Wiley. 2023, 41(4), pp. 431-442. ISSN 1001-604X. eISSN 1614-7065. Available under: doi: 10.1002/cjoc.202200542
BibTex
@article{Fakharuddin2023Triet-66361,
  year={2023},
  doi={10.1002/cjoc.202200542},
  title={A Triethyleneglycol C<sub>60</sub> Mono-adduct Derivative for Efficient Electron Transport in Inverted Perovskite Solar Cells},
  number={4},
  volume={41},
  issn={1001-604X},
  journal={Chinese Journal of Chemistry},
  pages={431--442},
  author={Fakharuddin, Azhar and Armadorou, Konstantina‐Kalliopi and Zorba, Leandros P. and Tountas, Marinos and Seewald, Tobias and Schütz, Emilia R. and Schmidt-Mende, Lukas and Vougioukalakis, Georgios C. and Nazeeruddin, Mohammad Khaja and Vasilopoulou, Maria}
}
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