Single-crystal hybrid perovskites (SC-HP) stand out as prominent materials in the family of next-generation semiconductors, owing to their outstanding properties, including tunable bandgaps, high absorption coefficients, excellent photophysical properties, intense luminescence, and their low-cost solution-based processability ^{[1, 2]}. Compared to their polycrystalline counterparts, single-crystal perovskites exhibit longer carrier lifetimes and diffusion lengths, lower trap state density, and enhanced environmental stability ^[3,4]. Two-dimensional SC-HP are especially interesting as their long-range ordered multiple quantum well structure induces additional properties such as large excitonic effects.

In this work, we present the progress in the growth of single crystal hybrid perovskites using the space-confined approach. We then investigate the structural properties, morphology, and optoelectronic behavior of 2D thin film of PEA₂PbI₄ single-crystals grown with this technique. We fabricate a planar photodetector and study its spectral photoresponse as a function of temperature and wavelength and its stability under environmental conditions.

The results demonstrate the synthesis of high-quality single crystalline materials, displaying low defect density and suppressed bias induced ion migration, and provide advancement in the comprehension of photodetection mechanisms in this material.

[1] Simbula, A. et al. Nat Commun 2023, 14, 4125.
[2] Simbula A, Demontis V et al. ACS Omega 2024, 9, 36865−36873.
[3] Liu, Y. et al. Nat Commun 2018, 9, 5302.
[4] Gao, X. et al. Advanced Science 2019,6,1900941.