Using Silver Nanoparticles-Embedded Silica Metafilms as Substrates to Enhance the Performance of Perovskite Photodetectors

Abstract

Plasmonic metal nanostructures provide a promising strategy for light trapping and therefore can dramatically enhance photocurrent in optoelectronics only if the trapped light can be coupled effectively from plasmons to excitons, whereas the reverse transfer of energy, charge, and heat from excitons to plasmons can be suppressed. Motivated by this, this work develops a scheme to implement a metafilm with Ag nanoparticles (NPs) embedded in 10 nm thick silica (Ag NPs–silica metafilm) to the active device channel of a hybrid perovskite film/graphene photodetector. Remarkably, an enhancement factor of 7.45 in photoresponsivity, the highest so far among all the reports adopting plasmonic metal NPs in perovskite photodetectors, has been achieved on the photodetectors with the Ag NPs–silica metafilms. Considering that the synthesis of the Ag NPs–silica metafilms can be readily scaled up to coat both rigid and flexible substrates, this result provides a low-cost metaplatform for a variety of high-performance optoelectronic device applications.

Localized surface plasmon effects on the photophysics of perovskite thin films embedding metal nanoparticles

“…[7][8][9] Among the various contributions from the field of photonics proposed to improve light harvesting efficiency, photoemission, or other concomitant effects such as carrier dynamics, those based on the use of plasmonic resonances stand as the most widely explored. [10][11][12][13][14] In particular, numerous experimental works report the photovoltaic or photodetection performance enhancement that results from coupling metallic nanostructures to organic metal halide perovskite films. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] However, the origin of the improvement reported remains, in most cases, unclear.…”

Fast and Low-Cost Synthesis of MoS2 Nanostructures on Paper Substrates for Near-Infrared Photodetectors

“…Thus, we believe that, in our device, the surface plasmon resonance in the Ag NPs electrode is light excited and generates hot electrons via nonradiative decay plasmonic resonance, since the Ag NPs show a plasmonic resonance signal in the near-infrared region, as shown in Figure S3 in the supplementary file. The energy of the hot electrons may be greater than the small Schottky barrier between Ag NPs and MoS 2 , and it can be injected into the MoS 2 multilayer generating a photocurrent [57][58][59]. Additionally, the effect of the MoS 2 phases (1T and 2H) on the electrical performances of hybrid PDs was compared by Wang et al [60] and results indicated that the metallic 1T phase exhibited a high R value.…”

Nanohybrid Photodetectors

“…Reproduced with permission. [153] Copyright 2019, American Chemical Society. mechanical stability and high-performance photodetection.…”

“…Plasmonic metal nanostructures may be placed in proximity to nanohybrids photodetectors for the benefit of light trapping. [ 153 ] A recent work by Alamri et al [ 154 ] combines the plasmonic effects from TMD nanodiscs grown on graphene and Ag nanoparticles deposited using an in vacuo process to obtain an enhanced photoresponse.…”

“…i) Schematic of silver nanoparticles embedded in silica metafilms to enhance the responsivity of the perovskite photodetector. Reproduced with permission [153]. Copyright 2019, American Chemical Society.…”