Publication date: 5th November 2025
The presentation focuses on tin-based perovskite (Sn-PVK), which is a promising candidate for the light-harvesting layer in high-efficiency solar cells. Device efficiency has been improved step by step1,2. Stability is another critical issue that must be addressed. Improvements in stability have been achieved by suppressing ion migration from various layers, such as H⁺ diffusion from PEDOT:PSS (HTL), halide ion diffusion from the perovskite layers, and Sn⁴⁺ diffusion from the perovskite3-5. Sn⁴⁺ tends to diffuse toward heterointerfaces when samples are maintained at 85 °C, resulting in decreased efficiency. To prevent Sn⁴⁺ formation, 2-methylaminopyridine (2-MAP) was used instead of DMSO. Stability under light exposure was enhanced by passivating both the top surface and the buried interface using passivation molecules containing ethylenediamine moieties⁶. In conclusion, reducing the concentration of Sn⁴⁺ (via DMSO-free ink), avoiding ionic species (by replacing PEDOT:PSS as the HTL), and suppressing ion diffusion through the use of inorganic layers such as GeOx and ALD-deposited SnOx have all contributed to improved device stability.
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International Conference on Hybrid and Organic Photovoltaics
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