Publication date: 15th December 2025
3D superlattices made of colloidal quantum dots are a promising candidate for the next generation of optoelectronic devices as they are expected to exhibit a unique combination of tunable optical properties and coherent electrical transport through minibands. In my presentation I will show the fabrication of 3D superlattices of PbSe and PbS QDs with nanoscale-level controlled ordering over large areas [1, 2], and of outstanding transport properties. The measured electron mobilities for PbSe superlattices are the highest ever reported for a self-assembled solid of fully quantum-confined objects (electron mobility up to 278 cm2 V−1 s−1). This ultimately demonstrates that optoelectronic metamaterials with highly tunable optical properties (in this case in the short-wavelength infrared spectral range) and charge mobilities approaching that of bulk semiconductor can be obtained. This finding paves the way toward a new generation of optoelectronic devices.
[1] J. Pinna, R. Mehrabi Koushki, D. S. Gavhane, M. Ahmadi, S. Mutalik, M. Zohaib, L. Protesescu, B. J. Kooi, G. Portale, M. A. Loi, Approaching Bulk Mobility in PbSe Colloidal Quantum Dots 3D Superlattices. Adv. Mater., 35, 2207364 (2023).
[2] J. Pinna, E. Pili, R. Mehrabi Koushki, D. S. Gavhane, F. Carlà, B. J. Kooi, G. Portale, and M. A. Loi PbI2 Passivation of Three Dimensional PbS Quantum Dot Superlattices Toward Optoelectronic Metamaterials ACS Nano, 18, 29, 19124 (2024).
[3] Pinna, J., Mednicov, A., Mehrabi Koushki, R. et al. Langmuir-Schaefer deposition of 2D PbS quantum dot superlattices with millimetre square coverage. Nat Commun 16, 9008 (2025). https://doi.org/10.1038/s41467-025-64065-y
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