Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Films of fullerene and derivatives may play an important role as electron transport layers (ETLs) in the emerging halide perovskite solar cell field due to their unique combination of optoelectronic properties and low temperature processing possibilities [1]. Nevertheless, their use has been mostly limited to devices with inverted architecture, since fullerene films may suffer significant degradation during regular architecture solar cell fabrication because of their non-negligible solubility in the solvents used for perovskite solution processing. [2] However, the ability of fullerene derivatives to be dissolved together with the perovskite precursors may also open wide to develop advanced processing approaches. We recently reported on using [70]fullerene-saturated perovskite processing solutions (namely “fullerene saturation approach” (FSA)) to avoid damage of the [70]fullerene films during the perovskite processing [3]. Furthermore, FSA has also been proven to improve the performance of the perovskite film, resulting in an enhancement of the power conversion efficiency of solar cells based on different ETLs (i.e. [60]fullerene, [70]fullerene and TiO2), suggesting universality of the beneficial effect [3]. Going beyond of these two successful cases, a smart and simple protocol to deposit perovskite:fullerene blend films directly on glass/FTO substrates will be presented. By this means, efficient ETL-free perovskite solar cells (from 25 devices: mean PCE higher than 13% vs. < 10% in fullerene-free) with very good charge carrier selectivity (i.e. fill factor > 74%) have been prepared. The microstructural characterization of perovskite:fullerene blend films, impedance spectroscopy and photovoltage decay characterization will be correlate to discuss about the distribution of the fullerene and its role in the solar cell working mechanism. All in all, this innovative architecture (i.e. glass/FTO/perovskite:fullerene/spiro-OMeTAD) does not only simplify the fabrication process (i.e. no ETL separate deposition), but also provides further insights into the charge carrier transport and transfer mechanisms in the halide perovskite films and interfaces. A comparative overview for different fullerene derivatives will be given too.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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