Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.263
Publication date: 16th December 2024
The demand for sustainable and efficient optoelectronic materials has led to significant interest in lead-free halide perovskites. Among these, CsCu2I3, a one-dimensional copper-based halide perovskite, has emerged as a promising material due to its excellent optoelectronic properties, high stability, and non-toxic composition. CsCu2I3 exhibits strong quantum confinement and broad absorption in the ultraviolet (UV) region, making it suitable for applications in photodetectors. Its self-trapped exciton (STE) emission mechanism ensures a high photoluminescence quantum yield in the visible range and substantial Stokes shift, critical for UV detection. [1], [2]
In this study, CsCu2I3 was processed into thin films using an environmentally friendly inkjet printing method. A stable precursor ink was synthesized by dissolving CsI and CuI in dimethyl sulfoxide (DMSO) at a 1:2 molar ratio to obtain a 0.5 M solution. Films were printed onto ozone-treated ITO-patterned glass substrates with interdigitated electrodes at varying distances (50–200 µm) in order to define our photoconductor, with a thickness about 50 nm. Inkjet printing parameters such as drop spacing and platen temperature were optimized to produce high-quality and uniform films. The printed films were annealed at 100 °C under vacuum to enhance their crystallinity and stability.
The fabricated photoconductors were characterized both optically and electrically. Transmittance and reflectance measurements of thin films revealed an absorption edge at Eg = 3.75 eV, i.e., wavelengths shorter than 330 nm are efficiently absorbed. Electrical measurements, including current-voltage and current-time responses under illumination across the 280–500 nm range, confirmed the significant photodetection capabilities of our photoconductors in the UV region (see Figure), with responsivities above 0.1 A/W at wavelengths below 300 nm at 5 V. These results position inkjet-printed CsCu2I3 as a versatile, lead-free material for the next generation of UV photodetectors. This work highlights the potential of scalable, low-cost manufacturing techniques for eco-friendly photonic applications.
This work was financially supported by the Spanish national projects LIP-FREE (PID2022-140978OB-I00) and PIXIE_SENS (PDC2023-145804-I00).
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