Perovskite/Silicon Tandem Solar Cells: Challenges Towards HighEfficiency in 4-Terminal and Monolithic Devices

Abstract
Perovskite and silicon solar cells have recently been shown to be perfect partners for tandem devices with potentially very high efficiency at low additional costs over standard silicon cells. Here, we present the development of efficient perovskite top cells suitable for 4-terminal and monolithic tandem integration on silicon heterojunction bottom cells. We show a 4-terminal tandem measurement with 25.6% efficiency on small cells and 23.2% on a 1 cm 2 fully integrated device. Monolithic tandems with >20% efficiencies were developed on several types of silicon wafers, allowing for a direct optical comparison. We identify parasitic absorption to be the limiting factor for high performance and discuss several practical solutions to reduce them.

Citation
Werner, J., Sahli, F., Kamino, B., Sacchetto, D., Brauninger, M., Walter, A., … Allebe, C. (2017). Perovskite/Silicon Tandem Solar Cells: Challenges Towards High- Efficiency in 4-Terminal and Monolithic Devices. 2017 IEEE 44th Photovoltaic Specialist Conference (PVSC). doi:10.1109/pvsc.2017.8366665

Acknowledgements
The project comprising this work is evaluated by the Swiss National Science Foundation and funded by Nano-Tera.ch and by the NRP 70 “Energy Turnaround” Program with financing from the Swiss National Science Foundation and the Swiss Federal Office of Energy, under Grant SI/501072-01. This work has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 653296.

Publisher
IEEE

Conference/Event Name
2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)

DOI
10.1109/PVSC.2017.8366665

Additional Links
https://ieeexplore.ieee.org/document/8366665/

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