Graphene-Scaffolded Ultrathin Perovskite Nanocrystal Films for Amplifying Energy Localization via Dual-Mode Nonhybridizing Quasi-BICs
Journal
Nano Letters
Journal Volume
26
Journal Issue
13
Start Page
4439
End Page
4448
ISSN
15306984
Date Issued
2026-04-08
Author(s)
Ho, Ya-Lun
Chen, Mu-Hsin
Liu, Tsung-Hsin
Hsieh, Fong-Liang
Chiang, Chun-Hao
Deng, Chih-Zong
Lai, Man-Hong
Shiue, Jessie
Liu, Shuaicheng
Sakurai, Haruyuki
Fu, Jui-Han
Konishi, Kuniaki
Tung, Vincent
Chang, Yu-Ming
Huang, Shao-Ku
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) CsPbBr3 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.
Subjects
Bound states in the continuum (BIC)
Dual-mode resonance
Graphene scaffolding
Light-matter interaction
Perovskite nanocrystals
Photonic membrane
Publisher
American Chemical Society
Type
letter