Boosting the Performance of Flexible Perovskite Photodetectors Using Hierarchical Plasmonic Nanostructures

Abstract

Plasmonic nanostructures can enhance the performance of photodetectors (PDs) owing to their amplification effect in light absorption, leading to overcoming the inherent properties of the photoactive layer. Herein, hierarchical plasmonic nanopatterns have been prepared and used for high‐performance flexible perovskite PDs. The developed hierarchical nanostructures, featuring nanoposts on cross‐nanograting patterns, exhibit a notably enhanced light trapping effect compared to hierarchical nanostructures based on a unidirectional simple nanograting structure. Moreover, hierarchical pattern‐based perovskite PDs show a photoresponsivity of 580 mA W−1 and a specific detectivity of 3.2 × 1012 Jones, which are 420% and 990% higher than those of perovskite PDs without plasmonic nanostructures, respectively. Furthermore, a flexible 10 × 10 PD array has been developed, which enables the accurate mapping of light signals with exceptional operational and mechanical stabilities, under a bending radius as small as 8 mm and after undergoing more than 1000 bending cycles. Comprehensive analyses using finite‐difference time‐domain calculations and photoluminescence mapping reveal the effective light trapping effect of hierarchical plasmonic patterns in the perovskite layers. This work provides an efficient approach to achieve high‐performance perovskite optoelectronic devices.

Formation of Linear Plasmonic Heterotrimers Using Nanoparticle Docking to DNA Origami Cages

“…Within assemblies of plasmonic metal nanoparticles (NPs), the surface plasmons of these NPs can interact and hybridize, forming collective modes in a fashion that is analogous to how electronic wave functions in atoms create molecular orbitals. , These molecule-like collective modes give rise to numerous properties unavailable in individual particles, such as strong local field enhancement, Fano resonances, magnetic resonances, , and chiral optical properties. , Consequently, these assemblies hold significant potential for applications in biomolecular sensing, , surface-enhanced Raman scattering (SERS) and fluorescence spectroscopy, , and energy harvesting. , …”

“…8,9 Consequently, these assemblies hold significant potential for applications in biomolecular sensing, 10,11 surface-enhanced Raman scattering (SERS) and fluorescence spectroscopy, 12,13 and energy harvesting. 14,15 Strong plasmonic coupling, crucial for these collective properties, depends heavily on geometric features like gap sizes and "bond angles". However, precisely defining these parameters, especially in more complex assemblies comprising NPs of different sizes, remains a formidable challenge.…”

“… 8 , 9 Consequently, these assemblies hold significant potential for applications in biomolecular sensing, 10 , 11 surface-enhanced Raman scattering (SERS) and fluorescence spectroscopy, 12 , 13 and energy harvesting. 14 , 15 …”

Charge Transfer in 2D Halide Perovskites and 2D/3D Heterostructures

“…Halide perovskites are emerging materials commonly used in photovoltaics (PVs), − light-emitting diodes (LEDs), − transistors, − and photodetectors. − Conventional three-dimensional (3D) halide perovskites have the structural formula ABX 3 , where A + represents a small cation (e.g., Cs + , methylammonium (MA + ), formamidinium (FA + ), etc. ), B 2+ denotes the central metal atom (e.g., Pb 2+ , Sn 2+ , etc.…”