Graphene-Scaffolded Ultrathin Perovskite Nanocrystal Films for Amplifying Energy Localization via Dual-Mode Nonhybridizing Quasi-BICs.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41902776.
- Also identified by DOI 10.1021/acs.nanolett.6c00330 and PMC identifier 13067381.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Solution-processed metal halide perovskite nanocrystals (NCs) have emerged as exceptional emitters for next-generation optoelectronics and nanophotonics, owing to their high photoluminescence quantum yields and tunable optical properties. However, coupling these colloidal nanomaterials with complex photonic resonators faces severe limitations, particularly on suspended structures where capillary-induced solution leakage disrupts film continuity, fundamentally hindering efficient light-matter interactions. Here, we introduce a graphene-scaffolding strategy that overcomes these limitations, enabling the deterministic fabrication of a continuous, ultrathin (∼20 nm) CsPbBr<sub>3</sub> NC film on freestanding photonic membranes. The atomically thin graphene interface effectively bridges air holes, preventing nanomaterial leakage and suppressing scattering losses. This architecture provides an ideal nanophotonic platform to exploit engineered dual-mode nonhybridizing bound states in the continuum. By aligning orthogonal resonances for field superposition, we achieve giant energy localization and a record-high (∼200-fold) photoluminescence enhancement. This work highlights 2D-material scaffolding as a universal interface for integrating solution-processed nanomaterials with advanced nanophotonic architectures.