Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO24)
Publication date: 25th April 2024
Lead-tin (Pb-Sn) perovskites are a highly promising composition for single-junction and all-perovskite tandem solar cells due to their narrower bandgap and reduced toxicity. Recently, a series of strategies including interface passivation and improved crystallization have been devoted to reducing p-type doping and non-radiative recombination, resulting in record efficiencies (> 23%). However, the road towards commercialization of perovskite solar cells requires more efforts towards developing scalable deposition techniques and stable systems. The use of quasi-two-dimensional (quasi-2D) phases has resulted in superior stability towards the environment and large improvement in the crystallization with respect to the 3D compositions. Here, quasi-2D Pb-Sn perovskite is successfully prepared by a two-step blade coating. A record power conversion efficiency (PCE) of 15.06% is obtained with the in-situ passivation with tin selenide (SnSe). Furthermore, we introduced a new solvents (2-Methyl-2-butanol) in the second step, further promoting the PCE above 16%. We believe these results pave the way for the development of stable and environmentally friendly perovskite devices with scalable strategy.
This publication is part of the Netherlands Organization of Scientific Research (NWO) – Focus Group “Next Generation Organic Photovoltaics”, participating in the Dutch Institute for Fundamental Energy Research (DIFFER) and CogniGron research center. This work was partially funded by the European Union's Horizon 2020 program, through a FET Proactive research and innovation action under grant agreement No. 101084124 (DIAMOND).
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