Video Link: https://grenoble-inp.zoom.us/j/97291423907
Meeting ID: 972 9142 3907
Code to enter: 485963
The PhD thesis of Romain Lavoipierre, entitled “Perovskite Solar Cells by Electrodeposition: From Stability Optimization to Lead-Free Architectures and Recycling Solutions”, was conducted at LEPMI (GUIDE research group) under the supervision of Lara Perrin and Lionel Flandin. He will present his thesis to the following jury:
– Lara Perrin, Associate Professor, Université Savoie Mont-Blanc, Thesis Director
– Thomas Rath, Senior Scientist, Graz University of Technology, Reviewer
– María Belén Villacampa Naverac, Associate Professor, Universidad de Zaragoza, Reviewer
– Frédéric Garet, Full Professor, Université Savoie Mont-Blanc, Examiner
– Cédric Mayer, Full Professor, Université de Versailles Saint-Quentin-en-Yvelines, Examiner
– Émilie Planes, Full Professor, Université Savoie Mont-Blanc, Examiner
– Lionel Flandin, Full Professor, Université Savoie Mont-Blanc, Invited
This thesis focuses on the development of electrodeposited perovskite solar cells (PSCs), a rapidly emerging photovoltaic (PV) technology offering high efficiency at a low fabrication cost. It addresses several critical challenges, such as performance, stability, toxicity, and recyclability, through material engineering, the use of functional additives, lead-free compositions, and recycling strategies. Incorporating 5-ammonium valeric acid iodide into the fabrication of mixed 3D−2D electrodeposited perovskites (MAPbI3)1−(AVA)2PbI4)x improves crystallinity and delays degradation. This increases PV efficiency by 65% compared to electrodeposited MAPbI3, thereby demonstrating the importance of functional additives and process optimization for durable PSCs. The addition of bismuth to mixed 3D-0D electrodeposited perovskites (MAPbI3)1-(MA)3Bi2I9)x enhances their resistance to environmental stress, enabling 70% PV efficiency retention after 1,000 hours in high-humidity conditions. This demonstrates the critical role of composition engineering and deposition control. Lead-free perovskites (MA3Bi2I9, BiI3) were also synthesized via electrodeposition, offering an environmentally safer alternative while maintaining optimized optoelectronic properties, thus paving the way for sustainable PSCs. Finally, a recycling strategy that regenerates degraded perovskite layers and reconstructs functional devices enables the recovery of about 75% of the initial PV efficiency while reducing environmental impact and manufacturing costs. This approach establishes the proof of concept for a circular use of materials, even for applications as complex as PSCs, thereby paving the way for new strategies for sustainable and responsible deployment.