Publication date: 15th December 2025
Halide perovskites are revolutionizing the field of optoelectronic devices, encompassing applications from solar cells to LEDs, thanks to their outstanding optical and electrical properties. These materials are characterized by high absorption coefficients, long carrier diffusion lengths, and efficient charge transport, positioning them as frontrunners in advanced technology development. Perovskite solar cells (PSCs) have now exceeded 27% efficiency, making them the leaders among thin-film technologies. However, despite their high efficiency, the widespread commercialization of three-dimensional (3D) perovskites is hindered by their instability, particularly in humid environments, as their soft ionic lattice degrades upon exposure to moisture and oxygen, presenting a significant challenge to their long-term viability. To address this, quasi-two-dimensional (2D) perovskites have emerged as promising alternatives. Their layered structure, incorporating larger organic cations, enhances environmental stability by shielding the inorganic framework from degradation. In addition, in these materials the electronic properties, such as bandgaps and exciton binding energies, can be precisely adjusted, essential for optimizing device performance.
The charge dynamics and transfer processes in thin films of mixed-dimensional quasi-2D MAPI-based perovskites will be presented. By combining femtosecond transient absorption spectroscopy (FTAS) and photoluminescence (PL), the role of specific n-phases in the charge transfer dynamics will be discussed in the light of the correlation between the phase distribution within the film and the corresponding band-alignment.[3,4] Particular attention is given to the temporal evolution of photobleaching features, which reveals charge transfer and separation between higher- and lower-dimensional phases.
Our findings emphasize the critical importance of controlling the dimensionality gradient in active materials composed of mixed 2D perovskites, optimizing charge transport and separation by promoting efficient transitions between low-n and high-n phases.
S.T., G.A., D.C., P.O.K. acknowledge funding from the European Union – NextGenerationEU, M4C2, within the PNRR project NFFA-DI, CUP B53C22004310006, IR0000015. D.C., S.T., G.A., P.O.K., A.P., F.T., and A.A. acknowledge financial support under the National Recovery and Resilience Plan (NRRP), Mission 4, Component 2, Investment 1.1, Call for tender No. 104 published on 2.2.2022 by the Italian Ministry of University and Research (MUR), funded by the European Union – NextGenerationEU – Effective Light management in 2D perOvskite absorbeRs for A disruptive tanDem phOtovoltaic technology (ELDORADO) – CUP E53D23001720001 – Grant Assignment Decree No. 957 adopted on 30/06/2023 by the Italian Ministry of University and Research (MUR).
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