Monolithic 2-terminal perovskite silicon tandem solar cells

Patricia S. C. Schulze^a, Özde Ş. Kabakli^a, Alexander J. Bett^a, Martin Bivour^a, Raphael Efinger^a, Bastian Fett^b, Angelika Hähnel^c, Christian Hagendorf^c, Bettina Herbig^b, Maryamsadat Heydarian^a, Minasadat Heydarian^a, Hunter King^d, Stefan Lange^c, Christoph Luderer^a, Christoph Messmer^a, Volker Naumann^c, Michaela Penn^a, Camila A. Romero Sierra^a, Martin Schubert^a, Volker Sittinger^d, Leonard Tutsch^a, Martin Hermle^a, Stefan W. Glunz^a^,^e, Andreas W. Bett^a, Jan Christoph Goldschmidt^a

^aFraunhofer Institute for Solar Energy Systems ISE, Germany, Heidenhofstraße, 2, Freiburg im Breisgau, Germany

^bFraunhofer Institute for Silicate Research ISC, Germany, Germany

^cFraunhofer Institute for Silicon Photovoltaics CSP, Germany, Germany

^dFraunhofer Institute for Surface Engineering and Thin Films IST, Germany, Germany

^eLaboratory for Photovoltaic Energy Conversion, Albert-Ludwigs-Universität Freiburg, DE, Germany

International Conference on Hybrid and Organic Photovoltaics
Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)

Online, Spain, 2021 May 24th - 28th

Organizers: Marina Freitag, Feng Gao and Sam Stranks

Oral, Patricia S. C. Schulze, presentation 061
Publication date: 11th May 2021

Perovskite silicon tandem solar cells promise lower levelized costs of electricity than single-junction silicon and perovskite solar cells. Achieving this goal requires high power conversion efficiencies >27% and stability for long device lifetime. [1] Furthermore, deposition on textured silicon would enable higher energy yields, [2] and lead-free perovskite absorbers would avoid acceptance issues due to environmental concerns. Applicability to different bottom solar cell concepts, such as PERC, TOPCon or SHJ, would further facilitate an evolutionary transition of the PV industry. [3]

Our work addresses the above described challenges towards an industrialization of perovskite silicon tandem solar cells. We present tandem devices in the n‑i‑p and the p‑i‑n device architecture reaching 25.1% certified stabilized efficiency using the photo-stable bandgap adapted perovskite composition FA_0.75Cs_0.25Pb(I_0.8Br_0.2)₃. We further show the deposition of the absorber on industry-relevant random pyramid silicon texture for improved light management and discuss possible options towards upscaling. Regarding lead-free perovskite absorbers, we present process-engineering of Cs₂AgBiBr₆ films and their application in solar cell devices.

References:

[1] Zafoschnig, A. L.; Nold, S.; Goldschmidt, J. C. The Race for Lowest Costs of Electricity Production: Techno-Economic Analysis of Silicon, Perovskite and Tandem Solar Cells. IEEE J. Photovolt. 2020, 10, 1632-1641.

[2] Tucher, N.; et al. Energy yield analysis of textured perovskite silicon tandem solar cells and modules. Opt. Express. 2019, 27, A1419-A1430.

[3] Messmer, C.: The race for the best silicon bottom cell: Efficiency and cost evaluation of perovskite–silicon tandem solar cells. Prog. Photovolt. Res. Appl. 2020, 1-16.

Acknowledgements:

This work was partially funded by the Fraunhofer LIGHTHOUSE PROJECT (MaNiTU). Ö.Ş.Kabakli gratefully acknowledges scholarship support from the Dr. Ruth Heerdt Stiftung.

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