Enhanced Photoluminescence Quantum Yield, Lifetime, and Photodetector Responsivity of CsPbBr₃ Quantum Dots via Antimony Tribromide Post-Treatment

Abstract

Herein, we present the synthesis of CsPbBr 3 quantum dots (QDs) by a ligand-assisted reprecipitation (LARP) technique under an ambient atmosphere. Besides, the optoelectronic properties of CsPbBr 3 QDs were improved through antimony tribromide (SbBr 3 ) post-treatment. Photoluminescence quantum yield (PLQY) was enhanced from 72 to 89% for SbBr 3 post-treated QDs compared to as-synthesized QDs. High-resolution transmission electron microscopy (HR-TEM) analysis shows the formation of uniform-size CsPbBr 3 QDs (9.4 ± 1.3 nm) after SbBr 3 treatment. The X-ray diffraction (XRD) pattern confirms the presence of the cubic phase of CsPbBr 3 QDs before and post-treatment. Moreover, temperature-dependent PL and X-ray photoelectron spectroscopy (XPS) characterizations confirm the effective defect passivation with SbBr 3 post-treatment. The timeresolved PL lifetime of CsPbBr 3 QDs was enhanced from 24.80 ± 0.10 to 37.71 ± 0.09 ns after post-treatment. Finally, the posttreated QD-based self-powered photodetector device showed a high responsivity of 48.1 μA/W compared to the as-synthesized QD device's responsivity of 10.2 μA/W.

Solvent Evaporation Induced Large-Scale Synthesis of Cs4PbBr6 and CsPbBr3 Microcrystals: Optical Properties and Backlight Application for LEDs

“…Also, the ratio of precursors plays a major role in the stoichiometry of the so-formed perovskite solids. Mixing distinct ratios of CsBr and PbBr 2 into suitable solvents leads to the formation of perovskites of different dimensionalities. , Stringently, fruitful research is going on the synthesis of 0D Cs 4 Pbr 6 , 3D CsPbBr 3 , and their composites owing to their excellent luminescent properties though the origin behind the luminescent mechanism is still uncertain . Most of the optoelectronic applications including solar cells and LEDs are focused on developing microcrystals with fewer defects so that the recombination of charge carriers is reduced and is more stable when compared to nanocrystals.…”

“…Among the many, 0D Cs 4 PbBr 6 with robust green emission has pivoted the research interest into these areas of intervention involving the manufacturing of optoelectronic devices together with LEDs. A good deal of strategies including antisolvent vapor assisted crystallization, , inverse temperature crystallization, anion–cation reactions ligand assisted super saturated recrystallization, inhomogeneous interface reaction routes, reverse microemulsion techniques, and Couette–Taylor flow method , have been explored for the synthesis of Cs 4 PbBr 6 perovskite solids. Bakr et al reported the synthesis of pure phase perovskite solids via low-cost and low-temperature solution processing methods. , But all these methodologies either demand the presence of ligands (dodecylamine, oleylamine, oleic acid, etc.…”

Morphology‐Dependent Charge Carrier Dynamics and Ion Migration Behavior of CsPbBr3 Halide Perovskite Quantum Dot Films

“…[ 1–3 ] Several studies shed light on utilizing halide perovskite quantum dots (P‐QDs) as an effective optoelectronic component for the optical devices. [ 4,5,6 ] Inorganic perovskite quantum dots (QDs) of CsPbX 3 exhibit ultra‐stable stimulated emission with tunable wavelength [ 7 ] and cost‐effective preparation. [ 8 ] For example, by adjusting the halides ratio of the P‐QDs, the emission spectrum can be tuned over the entire visible region.…”

Synthesis of Mn2+:CsPb (Br1−xClx)3perovskite quantum dots in an ambient atmosphere: stability analysis and self-powered photodetector applications

“…Perovskite quantum dots (QDs) have gained wide attention in optoelectronic devices because of their strong optical absorption, long carrier diffusion length, low exciton binding energy and high PL quantum yield (PLQY). 1,2 These properties paved the way for their application in light emitting diodes (LEDs), 3,4 photodetectors, 5,6 lasers, and solar cells. 7,8 At first, the organometal halide perovskite QDs gained greater interest because of their low cost, broad absorption, and tunable PL emission 9 over the entire visible spectrum.…”