Towards up-scaling the 4-terminal all-perovskite tandem solar modules on flexible substrates
Vivek Babu a, Mario Alejandro Mejia Escobar a, Rosinda Fuentes Pineda a, Mateusz Ścigaj a, Pierpaolo Spinelli a b, Konrad Wojciechowski a b
a Saule Technologies, Wroclaw Technology Park, 11 Dunska, Wroclaw, 54-427, Poland
b Saule Research Institute, Wroclaw Technology Park, 11 Dunska, Wroclaw, 54-427, Poland
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Vivek Babu, presentation 129
Publication date: 20th April 2022

Multi-junction all-perovskite solar cells hold a great promise for reaching record high power conversion efficiency values. Additionally, the employment of flexible substrates provides attractive new functionalities, opening many new commercial exploitation routes. The present state-of-the-art of the flexible perovskite tandem devices is limited to very small areas, and non-scalable fabrication methods. Here, the development of large-area blade-coating of wide- and narrow-bandgap perovskite photoactive layers on flexible substrates is reported.  Optimized sub-junctions are assembled into the 4-terminal tandem solar modules, delivering 15.3% efficiency for the 50 cm2 active area. Applied surface modification strategies and interfacial engineering for both perovskite sub-modules, together with the robust flexible encapsulation, delivers promising reliability results, achieved in different indoor and outdoor aging tests.

This project was funded by the European Union’s Horizon 2020 MSCA Innovative Training Network (Grant 764787), the Foundation of Polish Science (First TEAM/2017-3/30), and the National Centre for Research and Development (POIR.01.02.00- 00-0309). We acknowledge the research team at Saule Technologies for their support.

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