Solvated Palladium (II) Complexes for Efficient and Stable All-Inorganic CsPbI2Br Perovskite Solar Cells

We present a novel approach to enhance the efficiency and stability of inorganic CsPbI2Br based perovskite solar cells (PSCs) through the incorporation of a solvated palladium (Pd) complex, PdBr2(PhCN)2, into perovskite precursor inks (PhCN = benzonitrile). This modification not only stabilizes the α-phase of CsPbI2Br perovskite owing to Pd2+ ions, which were found to be incorporated into the perovskite structure at the B-site, but also effectively improves the perovskite film morphology through the removal of benzonitrile molecules during annealing. Further systematic study reveals that the addition of PdBr2(PhCN)2 results in a better matched energy-level alignment and reduced charge carrier recombination compared to the unmodified material. As a result, the optimized device enables an efficiency of 16.4% with an open-circuit voltage (VOC) of 1.27 V, which outperforms the control device (14.1%, 1.19 V). The device with PdBr2(PhCN)2 shows substantially enhanced environmental and operational stabilities, retaining ≈75% and 90% of their initial PCEs after 500 h aging, respectively. This study demonstrates the potential of B-site engineering via solvated precursors as an effective route toward stable and efficient inorganic perovskite photovoltaics.

Keywords

all-inorganic halide perovskite palladium complexes perovskites solar cells stability

Citation

Small 2026, 22, e14110. https://doi.org/10.1002/smll.202514110

URI

https://open.icm.edu.pl/handle/123456789/26715

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Artykuły ICHF PAN / IPC PAS Articles

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