Potential well ≈ Potential well
View article
Observation of Quantum Confinement in Monodisperse Methylammonium Lead Halide Perovskite Nanocrystals Embedded in Mesoporous Silica Open
Hybrid organic-inorganic metal halide perovskites have fascinating electronic properties and have already been implemented in various devices. Although the behavior of bulk metal halide perovskites has been widely studied, the properties o…
View article
Quantum confinement effects across two-dimensional planes in MoS2 quantum dots Open
The low quantum yield (∼10−5) has restricted practical use of photoluminescence (PL) from MoS2 composed of a few layers, but the quantum confinement effects across two-dimensional planes are believed to be able to boost the PL intensity. I…
View article
Effect of nitrogen doping on structural and optical properties of ZnO nanoparticles Open
Influence of nitrogen doping on structural and optical properties of ZnO nanoparticles has been studied. Undoped and N doped ZnO nanoparticles were synthesized via chemical precipitation approach. The prepared samples were characterized th…
View article
Nanotexturing To Enhance Photoluminescent Response of Atomically Thin Indium Selenide with Highly Tunable Band Gap Open
Manipulating properties of matter at the nanoscale is the essence of nanotechnology, which has enabled the realization of quantum dots, nanotubes, metamaterials, and two-dimensional materials with tailored electronic and optical properties…
View article
Quantum confinement effect and exciton binding energy of layered perovskite nanoplatelets Open
We report the preparation of monolayer (n = 1), few-layer (n = 2–5) and 3D (n = ∞) organic lead bromide perovskite nanoplatelets (NPLs) by tuning the molar ratio of methylammonium bromide (MABr) and hexadecammonium bromide (HABr). The abso…
View article
Quantum Confinement Effect and Photoenhancement of Photoluminescence of PbS and PbS/MnS Quantum Dots Open
The quantum confinement effect and photoenhancement of photoluminescence (PL) of lead sulphide (PbS) quantum dots (QDs) and lead sulphide/manganese sulphide (PbS/MnS) core shell QDs capped with thiol ligands in aqueous solution were invest…
View article
Quantum Confinement Effect of 2D Nanomaterials Open
Quantum confinement is the spatial confinement of electron‚Äìhole pairs (excitons) in one or more dimensions within a material, and also electronic energy levels are discrete. It is due to the confinement of the electronic wave function to…
View article
Nanoshell quantum dots: Quantum confinement beyond the exciton Bohr radius Open
Nanoshell quantum dots (QDs) represent a novel class of colloidal semiconductor nanocrystals (NCs), which supports tunable optoelectronic properties over the extended range of particle sizes. Traditionally, the ability to control the bandg…
View article
One-Dimensional Carrier Confinement in “Giant” CdS/CdSe Excitonic Nanoshells Open
The emerging generation of quantum dot optoelectronic devices offers an appealing prospect of a size-tunable band gap. The confinement-enabled control over electronic properties, however, requires nanoparticles to be sufficiently small, wh…
View article
Synthesis and Size-Dependent Optical Properties of Intermediate Band Gap Cu<sub>3</sub>VS<sub>4</sub> Nanocrystals Open
Intermediate band gap semiconductors are an underex-plored class of materials with unique optical properties of interest for photovoltaic and optoelectronic applications. Herein, we synthesize highly crystalline cubic Cu3VS4 nanocrystals w…
View article
HgSe Self-Doped Nanocrystals as a Platform to Investigate the Effects of Vanishing Confinement Open
Self-doped colloidal quantum dots (CQDs) attract a strong interest for the design of a new generation of low-cost infrared (IR) optoelectronic devices because of their tunable intraband absorption feature in the mid-IR region. However, ver…
View article
Size effects on structural and optical properties of tin oxide quantum dots with enhanced quantum confinement Open
Size-controllable tin oxide (SnO2) quantum dots (QDs) in aqueous solution were prepared by using stannous chloride and thiourea as source materials and the hydrothermal treatment was employed for size control during the self-assembly of Sn…
View article
Synergy of Excitation Enhancement and the Purcell Effect for Strong Photoluminescence Enhancement in a Thin-Film Hybrid Structure Based on Quantum Dots and Plasmon Nanoparticles Open
Reliable control of spontaneous radiation from quantum emitters, such as quantum dots (QDs), is an extremely important problem in quantum science, nanophotonics, and engineering. The QD photoluminescence (PL) may be enhanced near plasmon n…
View article
Controlled synthesis and optical properties of tunable CdSe quantum dots and effect of pH Open
Cadmium selenide (CdSe) quantum dots (Q-dots) were prepared by using non-coordinating solvent octadecene instead of coordinating agent trioctylphosphine oxide (TOPO). Reaction processes were carried out at various temperatures of 240°, 260…
View article
Top-Down Fabrication of Luminescent Graphene Quantum Dots Using Self-Assembled Au Nanoparticles Open
A new graphene quantum dot (GQD) fabrication method is presented, which employs a lithographic approach based on self-assembled Au nanoparticles formed by solid-state dewetting. The GQDs are formed by the patterned etching of a graphene la…
View article
Dense Ge nanocrystals embedded in TiO2 with exponentially increased photoconduction by field effect Open
Si and Ge nanocrystals in oxides are of a large interest for photo-effect applications due to the fine-tuning of the optical bandgap by quantum confinement in nanocrystals. In this work, dense Ge nanocrystals suitable for enhanced photocon…
View article
Many-body effects in doped WS2 monolayer quantum disks at room temperature Open
Due to strong Coulomb interactions, reduced screening effects, and quantum confinement, transition-metal dichalcogenide (TMD) monolayer quantum disks (MQDs) are expected to exhibit large exciton binding energy, which is beneficial for the …
View article
Effects of gap thickness and emitter location on the photoluminescence enhancement of monolayer MoS <sub>2</sub> in a plasmonic nanoparticle-film coupled system Open
Plasmonic nanocavities comprised of metal film-coupled nanoparticles have emerged as a versatile nanophotonic platform benefiting from their ultrasmall mode volume and large Purcell factors. In the weak-coupling regime, the particle-film g…
View article
Optical Properties of Silicon Nanowires Fabricated by Environment-Friendly Chemistry Open
Silicon nanowires (SiNWs) were fabricated by metal-assisted chemical etching (MACE) where hydrofluoric acid (HF), which is typically used in this method, was changed into ammonium fluoride (NH4F). The structure and optical properties of th…
View article
Structural and optical modifications of CdS properties in CdS-Au thin films prepared by CBD Open
In this work highlights the modifications of the crystalline structure and properties of the nanostructured cadmium sulphide (CdS) thin films, including gold quantum dots grown to form a hybrid metal-semiconductor system. By means of chemi…
View article
Effects of functionalization and side defects on single-photon emission in boron nitride quantum dots Open
Boron nitride quantum dots (BNQDs) functionalized with chemical ligands exhibit intriguing optoelectronic properties due to the quantum confinement effect. This paper presents peculiar insights on the effect of side defects on the electron…
View article
A Study of Quantum Confinement Effects in Ultrathin NiO Films Performed by Experiment and Theory Open
Ultrathin NiO films in the thickness range between 1 and 27 nm have been deposited on high-quality quartz substrates by direct magnetron sputtering under a rough vacuum with a base pressure of 2 × 10−2 mbar. The sputtering target was metal…
View article
Thickness-Induced Metal-Insulator Transition in Sb-doped SnO2 Ultrathin Films: The Role of Quantum Confinement Open
A thickness induced metal-insulator transition (MIT) was firstly observed in Sb-doped SnO 2 (SnO 2 :Sb) epitaxial ultrathin films deposited on "Equation missing" sapphire substrates by pulsed laser deposition. Both electrical and spectrosc…
View article
Surface passivation by l-arginine and enhanced optical properties of CdS quantum dots co-doped with Nd3+–Li+ Open
l-Arginine-passivated Nd3+ and Li+ co-doped CdS quantum dots (QDs) were synthesized by chemical precipitation method. Ultraviolet–visible absorption spectra of prepared QDs show absorption in the range of 477–450 nm indicating huge blue sh…
View article
Photoluminescence from colloidal silicon nanoparticles: significant effect of surface Open
Silicon nanoparticles (NPs) have long been regarded as a promising alternative for commercial organic dyes and typical quantum dots (e.g. CdSe) for applications in light emitting, bio-imaging, sensing, etc. The photoluminescence (PL) of Si…
View article
Gas-Phase Synthesis of Tunable-Size Germanium Nanocrystals by Inert Gas Condensation Open
Size-dependent optical properties of germanium (Ge) nanocrystals (NCs) make them a desirable material for optoelectronic applications. So far, the synthesis of ligand-free and tunable-size Ge NCs by inert gas condensation has been scarcely…
View article
Spectral Fingerprint of Quantum Confinement in Single CsPbBr<sub>3</sub> Nanocrystals Open
Lead halide perovskite nanocrystals are promising materials for classical and quantum light emission. To understand these outstanding properties, a thorough analysis of the band-edge exciton emission is needed, which is not reachable in en…
View article
Synthesis of copper quantum dots by chemical reduction method and tailoring of its band gap Open
Metallic copper nano particles are synthesized with citric acid and CTAB (cetyltrimethylammonium bromide) as surfactant and chlorides as precursors. The particle size and surface morphology are analyzed by High Resolution Transmission Elec…
View article
Cathodoluminescence in single and multiwall WS2 nanotubes: Evidence for quantum confinement and strain effect Open
For nanoparticles with sub-10 nm diameter, the electronic bandgap becomes size dependent due to quantum confinement; this, in turn, affects their electro-optical properties. Thereby, MoS2 and WS2 monolayers acquire luminescent capability, …
View article
Surface-Originated Weak Confinement in Tetrahedral Indium Arsenide Quantum Dots Open
While the shape-dependent quantum confinement (QC) effect in anisotropic semiconductor nanocrystals has been extensively studied, the QC in facet-specified polyhedral quantum dots (QDs) remains underexplored. Recently, tetrahedral nanocrys…