Publication date: 15th December 2025
Quasi-2D/3D perovskite heterostructures have garnered considerable attention for optoelectronic applications due to their tunable optical properties and enhanced stability in comparison to their 3D counterparts [1,2]. By controlling the composition and structure of heterostructures, it is possible to engineer heterostructures for high-performance photovoltaic applications. In this study, we investigate charge transport in quasi-2D/3D perovskite heterostructures and the impact of different organic spacer cations and the incorporation of thiocyanate additive [3,4]. Using UV-Vis spectroscopy, PL hyperspectral microscopy, and Time-Resolved Photoluminescence measurements, we report differences in phase composition and morphology resulting from the different fabrication routes and observe its impact on recombination dynamics. In addition to defect passivation effects, we reveal how the thiocyanate additive regulates the dynamics of charge-carrier transfer from wide-bandgap 2D domains to low bandgap 3D perovskite. Our findings provide insights into how the choice of spacer cation and incorporation of additives in the fabrication process influence carrier transport and recombination, offering strategies for optimizing quasi-2D perovskites for efficient and stable optoelectronic devices.
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