Boosting Photodetection via Plasmonic Coupling in Quasi-2D Mixed-n Ruddlesden-Popper Perovskite Nanostripes

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Quasi-2D metal halide perovskites show promise for photodetection due to their optoelectronic properties and stability.
• Developing high-performance photodetectors from these materials is challenging due to quantum and dielectric confinement.
• Plasmonic nanostructures offer an effective approach to enhance device efficiency.

Purpose of the Study:

• To enhance the photodetection capabilities of quasi-2D metal halide perovskite nanostripes.
• To investigate the effects of incorporating octadecanethiol (ODT)-functionalized silver nanostructure arrays (ANA).
• To optimize plasmon-exciton coupling and resonant energy transfer for improved photodetector performance.

Main Methods:

• Fabrication of ANA using colloidal lithography.
• Characterization using reflectance spectroscopy.
• Analysis using finite element method (FEM) simulations to understand plasmon-exciton interactions.

Main Results:

• ANA supports localized surface plasmon resonance (LSPR) modes that spectrally overlap with perovskite absorption and emission.
• ODT-functionalized ANA photodetectors exhibit weak to intermediate coupling, facilitating resonant energy transfer.
• A photocurrent enhancement factor of 838% was achieved, with photoresponsivities up to 70.41 mA W⁻¹, detectivities of 1.48 × 10¹¹ Jones, and external quantum efficiencies of 21.55%.

Conclusions:

• Incorporating ODT-functionalized ANA significantly enhances quasi-2D perovskite photodetector performance.
• The spectral overlap and coupling between plasmons and excitons are crucial for efficient energy transfer.
• This strategy offers a pathway for developing high-performance plasmonic-perovskite photodetectors.