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Abstract
Halide perovskite nanowires (HP-NWs) exhibit fascinating optical properties, making them attractive for advanced technologies. However, instability and lack of an effective synthetic protocol limit their commercialization. To address this, we use nanoporous anodized aluminum oxide (AAO) metamaterial as templates for the growth of perovskite (CsPbBr3) NW arrays. AAO functions as both growth template and stabilizing medium. The NW array exhibits strong light-trapping ability, the pore geometric features (pore radius-R and distance between pores-d) have the potential to enhance the light-matter interactions (LMI). We demonstrate the impact of R and d on LMI within the AAO/CsPbBr3 system using theoretical Finite Difference Time Domain (FDTD) simulations for the first time. Optimal LMI was observed with R=d=25 nm and R=d=50 nm. We report ligand-free synthesis of CsPbBr3 NW arrays via spin-coating, drop-casting, and inverse temperature crystallization (ITC). The spin-coating and drop-casting yielded poor pore filling while the modified ITC method yielded nearly complete (>90%) pore filling with significant NW lengths. Our findings highlight the potential of AAO templates for protecting CsPbBr3 and addressing synthetic challenges in HPs and other semiconductor NW arrays. This study provides valuable references for LMI in HPs and advances HPs and NW array-based optical devices and renewable energy applications
Supplementary materials
Title
Optimized Growth and Manipulation of Light-Matter Interaction in Stabilized Halide Perovskite Nanowire Array
Description
In summary, our combined simulation and experimental approach offers valuable insights into optimizing LMIs in nanostructured materials. This study not only advances the understanding and synthesis of stable HPs and other NW arrays but also opens new avenues for the commercialization of HP-based devices, particularly in the fields of optical devices and renewable energy.
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