Chloride-Substituted Perovskite Enables Thick Middle Cell for Perovskite/Perovskite/Silicon Triple-Junction Solar Cells

Date

2026-06-28

Author

Heydarian, Minasadat
Fischer, Oliver
Heydarian, Maryamsadat
Wo, Yujie
Karalis, Orestis
Bett, Alexander J.
Sedani, Salar H.
Yıldız, İlker
Artuk, Kerem
Milot, Rebecca L.
Schindler, Florian
Wolff, Christian M.
Schubert, Martin C.
Borchert, Juliane
Schulze, Patricia S. C.
Glunz, Stefan W.

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Increasing the thickness of perovskite thin film absorbers allows for enhanced photo absorption, which increases the current and performance of the solar cells. In multijunction devices, thickness optimization is critical to achieve current matching between subcells, depending on the bandgap combination. However, maintaining film quality while balancing charge transport and recombination becomes more challenging as thickness increases. Herein, we investigate thickness limitations of wet-chemically processed 1.56 eV mixed cation mixed halide perovskites as middle cell in monolithic perovskite/perovskite/silicon triple-junction solar cells. It is found that Cs0.05(FA0.90MA0.10)0.95Pb(I0.95Br0.05)3 perovskite shows a decrease in performance for thickness >450 nm. Substituting bromide with chloride (Cl−) in the composition allows to increase layer thickness up to ∼700 nm without sacrificing fill factor (FF) and open-circuit voltage (VOC). The Cl-substituted absorbers show larger grain size, less nonradiative recombination loss, higher carrier lifetime, and mobility as evidenced by steady-state and transient photoluminescence, and optical pump/terahertz probe spectroscopy measurements. Thick Cl-substituted absorbers enhance performance up to 20% in 1 cm2 semitransparent single-junction devices. By integrating the ∼700 nm perovskite as middle cell in a perovskite/perovskite/silicon triple-junction device, an efficiency of 23.4% with a short circuit current density of 9.6 mA/cm2, a FF of 80.5%, and a VOC of 3026 mV is achieved.

Subject Keywords

chlorine-based perovskite, perovskite thickness, perovskite-based triple-junction solar cells, photovoltaics

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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105043113556&origin=inward
https://hdl.handle.net/11511/119879

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Test and Measurement Center In advanced Technologies (MERKEZ LABORATUVARI), Article