Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
Over the last decade, metal halide perovskite materials have triggered a huge interest in photovoltaics research because of their excellent optoelectronic properties, combined with the ease of bandgap engineering through chemical tunability and low-temperature solution processability. Their solar cells have reached 25.2% efficiency in 2019, outperforming multicrystalline silicon and silicon thin films and becoming the fastest growing photovoltaics technology.
Nevertheless, the presence of lead, which is present in the structure of the best performing perovskites, impose regulatory and environmental concerns.
For this reason, over the last few years, many efforts have been devoted to synthesizing lead-free perovskites, but despite the copious amount of novel materials, only few of them show suitable direct bandgaps for solar cell applications.
Among them, cesium titanium halide perovskites demonstrated tunable quasi-direct bandgaps in the optimal range for photovoltaics devices, namely between 1 eV and 2.5 eV. However, so far, the developed synthetic methods of these novel perovskites require elevated temperatures and the use of vacuum.
In this work, we tackle this problem by exploring novel low-cost large-scalable solution-phase syntheses of cesium titanium halide perovskites, with the aim of producing high quality materials for solar cells applications. We develop novel synthetic protocols of pure- and mixed-halide perovskites and carry out their structural and optical characterization, further supported by theoretical DFT calculations.
The authors acknowledge financial support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 725165. The authors also acknowledge financial support from Fundacio Privada Cellex, the program CERCA and from the Spanish Ministry of Economy and Competitiveness, through the “Severo Ochoa” Programme for Centres of Excellence in R&D. This project has received also funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 713729.
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