Publication date: 15th May 2026
Hybrid organic–inorganic metal halide perovskites are promising materials for next-generation optoelectronic devices due to their strong light absorption, tunable electronic properties, and solution-processable synthesis. Here, we report the fabrication of holey perovskite (BA2PbBr4, PEA2PbX4, PEA4AgBiX8 and OA2PbBr4, where BA = butylamonium, PEA = phenylethylammonium, OA = octylammonium, and X = Br or I) microcrystals directly on top of SiO₂/Si substrates using a simple solvent + anti-solvent mediated approach. The resulting microcrystals exhibit well-defined porous morphologies while retaining their overall crystallinity and structural integrity. Microscopy studies reveal uniformly distributed holes throughout the microcrystal body, whereas X-ray diffraction confirms preservation of the perovskite phase after the morphology modification. The engineered holey architecture creates new surfaces for endo-epitaxial growth of heterostructures such as BA2PbBr4-BA2PbI4, PEA2PbBr4-PEA2PbI4 etc.. The formation of the holey morphology is attributed to the selective dissolution of the organic spacer cations from the surface and enabling controlled material removal without complete crystal degradation. This facile morphology-engineering strategy offers a lithography-free route for tailoring perovskite microstructures and may enable applications in photodetectors, sensing, lasing, and advanced hybrid optoelectronic heterostructures.
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