Surface-Plasmonic-Coupled Photodetector Based on MAPbI₃ Perovskites with Au Nanoparticles: Significantly Enhanced Photoluminescence and Photodetectivity

Abstract

Organic–inorganic metal halide perovskites (OMHPs) are promising active materials suitable for highly efficient solar cells, photodetectors, light-emitting diodes, and sensors. In this study, methylammonium lead iodide (MAPbI3) thin sheets (TSs) were synthesized as OMHPs using both hybrid vapor-solution method for optical study and anti-solvent solution method for the photodetector. π-Conjugated polyelectrolyte (π-CPE), such as poly­(9,9-bis­(4′-sulfonatobutyl)­fluorene-alt-1,4-phenylene) potassium (FPS-K), was spin-coated on the MAPbI3 TS, and functionalized gold nanoparticles (Au-NPs) were hybridized. The laser confocal microscope photoluminescence (PL) intensity of the MAPbI3 TS was significantly enhanced after hybridization with Au-NPs/FPS-K, owing to the passivating effect of the FPS-K and the generation of extra-photoexcited charges by local surface plasmon resonance (LSPR) coupling with Au-NPs. These results were supported by the variation in the exciton lifetime measured from the time-resolved PL decay curves. The photocurrent of the MAPbI3 photodetector increased up to 1.1 × 104 times, and the photoresponsivity (R) and photodetectivity (D*) increased by 70 and 13 times, respectively, with the hybridization of Au-NPs/FPS-K. The highest D* of the Au-NPs/FPS-K/MAPbI3 photodetector was measured to be 7.5 × 1010 Jones at 735 nm excitation. The power and wavelength dependencies of R and D* for the MAPbI3 photodetector were also significantly improved by the Au-NPs/FPS-K hybrid. These results support the development of high-performance perovskite photodetectors utilizing LSPR coupling with the π-CPE layer.

Interlayer and intermolecular excitons in various donor–acceptor heterostructures: applications to excitonic devices

“…OIHPs have been extensively studied as active materials in optoelectronics, photonics, and sensors owing to their high quantum yield, excellent light absorption, and long carrier lifetimes. OIHPs can be synthesized using various techniques, such as chemical vapor deposition (CVD) growth, 30,44,48 solution spin coating, 22,24,45 hybrid vapor-solution method, 21,46 and mechanical exfoliation, 15,47 as depicted in Fig. 3.…”

“…Reproduced with permission. 46 Copyright 2022, American Chemical Society. (d) Exfoliation from single crystal.…”

“…(c) Hybrid vapor-solution method. Reproduced with permission 46. Copyright 2022, American Chemical Society.…”

Integrating Hybrid Perovskite Nanocrystals into Metal–Organic Framework as Efficient S-Scheme Heterojunction Photocatalyst for Synergistically Boosting Controlled Radical Photopolymerization under 980 nm NIR Light

“…Therefore, the perovskite occupies the channels of PCN-222, and PCN-222 encapsulates perovskite in situ successfully. The X-ray powder diffraction (PXRD) patterns show that the peaks at 14.16, 20.09, 28.43, and 40.59° in MAPbI 3 @PCN-222­(10%) correspond to the (110), (200), (220), and (400) planes of the tetragonal crystal MAPbI 3 , respectively, which do not disturb the framework structure of PCN-222 (Figure c). Also, pure-phase MAPbI 3 was obtained in the catalyst MAPbI 3 @PCN-222­(10%) without the PbI 2 residue (Figure S3).…”

GaAs Nanowire Photodetectors Based on Au Nanoparticles Modification

“…The key in the modification process of GaAs nanowires is to properly adjust the diameter and number of Au nanoparticles by controlling the evaporation rate time, respectively, to effectively amplify the photocurrent. The reason for promoting the photoelectric detection performance is the coupling of the electron gas in the Au nanoparticles with the excitation light [ 31 , 32 , 33 , 34 , 35 ]. Furthermore, the metal particles on the surface of the GaAs nanowires will introduce a local Schottky barrier, which generates a space charge region which promotes the separation and collection of photogenerated carriers effectively [ 36 , 37 , 38 , 39 ].…”