Boosting Perovskite Photodetector Performance in NIR Using Plasmonic Bowtie Nanoantenna Arrays

Abstract

Triple‐cation mixed metal halide perovskites are important optoelectronic materials due to their high photon to electron conversion efficiency, low exciton binding energy, and good thermal stability. However, the perovskites have low photon to electron conversion efficiency in near‐infrared (NIR) due to their weak intrinsic absorption at longer wavelength, especially near the band edge and over the bandgap wavelength. A plasmonic functionalized perovskite photodetector (PD) is designed and fabricated in this study, in which the perovskite ((Cs0.06FA0.79MA0.15)Pb(I0.85Br0.15)3) active materials are spin‐coated on the surface of Au bowtie nanoantenna (BNA) arrays substrate. Under 785 nm laser illumination, near the bandedge of perovskite, the fabricated BNA‐based plasmonic PD exhibits ≈2962% enhancement in the photoresponse over the Si/SiO2‐based normal PD. Moreover, the detectivity of the plasmonic PD has a value of 1.5 × 1012 with external quantum efficiency as high as 188.8%, more than 30 times over the normal PD. The strong boosting in the plasmonic PD performance is attributed to the enhanced electric field around BNA arrays through the coupling of localized surface plasmon resonance. The demonstrated BNA‐perovskite design can also be used to enhance performance of other optoelectronic devices, and the concept can be extended to other spectral regions with different active materials.

2D Cs2AgBiBr6 with Boosted Light–Matter Interaction for High‐Performance Photodetectors

“…These fast response times can be attributed to the high crystal quality and less grain boundaries in the 2D Cs 2 AgBiBr 6 , which is beneficial to the carrier transport. [ 62,63 ]…”

“…These fast response times can be attributed to the high crystal quality and less grain boundaries in the 2D Cs 2 AgBiBr 6 , which is beneficial to the carrier transport. [62,63] In conclusion, 2D lead-free double perovskite Cs 2 AgBiBr 6 was synthesized successfully using a simple space-confined method. By modifying the surface properties of the substrate, the concentration of precursor, and the gap spacing, synthesis of Cs 2 AgBiBr 6 ranging from bulk to 2D was achieved.…”

A Flexible Plasmonic-Membrane-Enhanced Broadband Tin-Based Perovskite Photodetector

“…As shown in Figure 4d, upon excitation by monochromatic light sources at 300, 365, 410, 460, 500, 600, and 630 nm, all photodetectors with Al 2 O 3 spacer of different thickness show high photocurrents at a bias voltage of 3 V. The highest photocurrent is at the excitation wavelength of 410 nm, which is in accordance with the plasmonic absorption peak of the Ag nanospheres capped with the Al 2 O 3 spacer, indicating that the local electric field can indeed achieve a significantly enhanced absorption in the perovskite QDs and result in an increased concentration of photogenerated electron−hole pairs. 49 According to a previous study, 50 the photocurrent enhancement factor (EF) of a photodetector can be defined by…”

Recent Progress on Electrical and Optical Manipulations of Perovskite Photodetectors

“…Aside from the nanoparticles, the LSP antenna structure has also been realized by Guo and co‐workers in 2020 (Figure 4d ). [ 148 ] An enhanced electric field from the plasmonic integration in this work increases light absorption through the LSP coupling of Au bowtie antenna arrays and the incident optical radiation. The photoresponsivity under 785 nm laser illumination is demonstrated with an enhancement factor of 2962%.…”