Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
The perovskite:fullerene blend films have recently shown outstanding results, including hysteresis minimization and enhanced stability, in halide perovskite solar cells [1]. In particular, we demonstrated CH3NH3PbI3:[70]fullerene films may be used as advanced light harvesters in efficient electron transport layer (ETL)-free solar cells [2], which are based on a simplified architecture that may be very appealing for the future industrial production of the perovskite-based PV technology. In this talk, apart from a short review on the application of perovskite:fullerene blend films in solar cells, the use of a variety of novel chemically modified fullerenes showing different electron accepting capabilities will be presented. The existing correlation between the LUMO energy level of the fullerene component and the open circuit voltage of the solar cells will also be discussed. In particular, blend films with isoxazolino[60] fullerenes will be highlighted by showing state-of-the-art power conversion efficiency (i.e. 14.3% [3]) for ETL-free architectures. Differences between [60] and [70]fullerenes in perovskite-based blend films will be also discussed. Interestingly, in contrast to their use as ETL in which the poorer electron mobility and visible light transmittance of [70]fullerene limit the performance of the solar cells [4], [70]fullerene seems to be better candidate for the blend films. Additionally, the use of a co-solvent for the processing of the perovskite:fullerene blend films may have a significant impact on the solar cell performance. The effect of the co-solvent on the microstructural and optoelectronic properties of the blend films will be discussed. Some practical guidelines for the choice of an appropriate co-solvent will be given. As an example, aromatic templates (e.g. o-xylene) will be proposed to be particularly beneficial compared to analogous aliphatic ones (e.g. methylcyclohexane). All in all, an overview and perspective analysis of perovskite:fullerene blends for halide perovskite solar cells will be provided.
References
Y. Shao, Z. Xiao, C. Bi, Y. Yuan, J. Huang, Nat. Commun. 2014, 5, 5784. J. Xu et al. Nat. Commun. 2015, 6, 7081.
J. Pascual et al. “Electron Transport Layer-Free Solar Cells Based on Perovskite–Fullerene Blend Films with Enhanced Performance and Stability” ChemSusChem 2016, 9, 2679–2685
R. Sandoval-Torrientes et al. “ Modified Fullerenes for Efficient Electron Transport Layer-
Free Perovskite/Fullerene Blend-Based Solar Cells” ChemSusChem 2017, 10, 2023–2029
S. Collavini et al. “Efficient Regular Perovskite Solar Cells Based on Pristine [70]Fullerene as Electron-Selective Contact” ChemSusChem 2016, 9, 1263–1270
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