A5033558957- Silicon Nanostructures and Photoluminescence
- Quantum Dots Synthesis And Properties
- Carbon and Quantum Dots Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Perovskite Materials and Applications
- Nanowire Synthesis and Applications
- Advanced biosensing and bioanalysis techniques
- Conducting polymers and applications
- ZnO doping and properties
- Photonic and Optical Devices
- Chalcogenide Semiconductor Thin Films
- Silicone and Siloxane Chemistry
- Advanced Sensor and Energy Harvesting Materials
- Heat Transfer and Numerical Methods
- Aerospace Engineering and Control Systems
- Advanced Thermoelectric Materials and Devices
- Biosensors and Analytical Detection
- Nanomaterials and Printing Technologies
- Organoboron and organosilicon chemistry
- Plasma Diagnostics and Applications
- Luminescence Properties of Advanced Materials
- Synthetic Organic Chemistry Methods
- Semiconductor materials and devices
- Nanofabrication and Lithography Techniques
Nanyang Technological University
2025
University of Victoria
2024-2025
University of Alberta
2018-2024
Sensitizing crystalline silicon (c-Si) with an infrared-sensitive material, such as lead sulfide (PbS) colloidal quantum dots (CQDs), provides a straightforward strategy for enhancing the infrared-light sensitivity of Si-based photodetector. However, it remains challenging to construct high-efficiency photodetector based upon Si:CQD heterojunction. Herein, we demonstrate that Si surface passivation is crucial building high-performance heterojunction We have studied one-step methyl iodine...
Halide perovskites are positioned at the forefront of photonics, optoelectronics, and photovoltaics, owing to their excellent optical properties, with emission wavelengths ranging from blue near-infrared, ease in manufacturing. However, vast composition space corresponding energies still not fully mapped, guided high-throughput screening that allows for targeted material synthesis would be desirable. To this end, we use experimental data literature build a machine learning model, predicting...
We report the cosolvency effect of formamidinium lead triiodide (FAPbI3) in a mixture γ-butyrolactone (GBL) and 2-methoxyethanol (2ME), phenomenon where FAPbI3 shows higher solubility solvent blend than either alone. found that exhibits 10× 30% 2ME GBL alone 40% at 90 °C. This enhanced is attributed to disruption hydrogen bonding network within 2ME, allowing its hydroxyl ether groups interact more freely with solute. Leveraging this phenomenon, we grew phase-stable α-FAPbI3 thin single...
Integrating lead sulfide (PbS) colloidal quantum dots (CQDs) with crystalline silicon (c-Si) has been proven to be an effective strategy in extending the sensitivity of Si-based photodetectors into infrared regime. Here, we demonstrate successful integration PbS CQD inks Si and construct a highly efficient heterojunction photodiode operating range from 800 up 1500 nm. Thanks well-passivated surface by two-step chlorination/methylation method high-quality inks, yields low density trap states,...
Abstract Luminescent colloidal silicon quantum dots (SiQDs) are explored as alternatives to metal‐based for light‐emitting diodes (LEDs) because of the abundance and biocompatibility silicon. To date, broad electroluminescence (EL) bandwidth (>100 nm) blueshifting EL at high applied voltages SiQD‐LEDs outstanding challenges that limit a competitive spectral purity device stability. Herein, fabrication testing incorporate Fabry–Pérot cavity reported which exhibit narrow linewidth low ≈23...
The discovery of metallic conductivity in polyacetylene [-HC=CH-]n upon doping represents a landmark achievement. However, the insolubility and dearth methods for its chemical modification have limited widespread use. Here, we employ ring-opening metathesis polymerization (ROMP) protocol to prepare functionalized polyacetylenes (fPAs) bearing: (1) electron-deficient boryl (-BR2 ) phosphoryl (-P(O)R2 side chains; (2) electron-donating amino (-NR2 groups, (3) ring-fused 1,2,3-triazolium units...
Luminescent colloidal silicon quantum dots (SiQDs) are sustainable alternatives to metal-based QDs for various optical applications. While the materials reliant on their photoluminescence efficiency, relationship between structure and photostability of SiQDs is yet be well studied. An amorphous (a-Si) shell was recently discovered in prepared by thermally-processed oxides. As a-Si known as a source defects upon UV irradiation, disordered could potentially have an adverse effect properties...
We introduce a straightforward and cost-effective water-assisted approach to transfer patterns of nanomaterials onto diverse substrates. The method relies on the hydrophobic effect utilizes water-soluble polymer film as carrier from patterned source substrate target substrate. Using this approach, are transferred readily solutions surfaces various shapes compositions with high fidelity for feature sizes approaching 10 microns.
Luminescent silicon nanoparticles have been widely recognized as an alternative for metal-based quantum dots (QDs) optoelectronics partly because of the high abundance and biocompatibility silicon. To date, broad photoluminescence line width (often >100 nm) QDs has a hurdle to achieving competitive spectral purity incorporating them into light-emitting devices. Herein we report fabrication testing straightforward configuration Fabry–Pérot resonators that incorporates thin layer SiQD–polymer...
Doped silicon quantum dots (SiQDs) with defined size, dopant distribution, and surface chemistry are highly sought after as a scientific curiosity because their unique properties offer wide array of potential applications including multimodal medical imaging photovoltaic devices. This report describes diffusion-based postsynthesis doping method for incorporating high concentrations B (2.5–5.0 at. %) into preformed SiQDs predefined sizes while simultaneously maintaining structure morphology....
Doped silicon nanocrystals (SiNCs) are promising materials that could find use in a wide variety of applications. Realizing methods to tailor the surface chemistry these particles offers greater tunability material properties as well broader solvent compatibility. Herein, we report organic-soluble B-doped SiNCs prepared via thermal processing method followed by phosphorous pentachloride etching induced functionalization with alkoxy ligands varied chain lengths. This approach provides...
Abstract Tin oxide (SnO x ) films synthesized by atomic layer deposition (ALD) are widely explored in a range of optoelectronic devices including electrochemical sensors, transistors, and photovoltaics. However, the integrity key ALD‐SnO precursor, namely tetrakis(dimethylamido)tin (IV) (TDMASn), its influence on properties ultimate remain unexplored. Here significant degradation TDMASn into bis(dimethylamido)tin(II) via Sn‐imine complex is reported, impact corresponding examined. It found,...
Nanoparticles (NPs) continue to be developed as labels for bioanalysis and imaging due their small size and, in many cases, emergent properties such photoluminescence (PL) superparamagnetism. Some applications stand benefit from amplification of the advantageous a NP, but this is not simple matter scaling size-dependent properties. One promising approach is, therefore, assemble copies NP into larger still nanoscale colloidal entity. Here, we use multiple types hydrophobic nanocrystal show...
Doped silicon quantum dots (SiQDs) with defined dopant distribution, size, and surface chemistry are highly sought-after as a scientific curiosity because their unique properties offer wide array of potential applications including multi-modal medical imaging photovoltaic devices. This report describes diffusion based post-synthesis doping method for incorporating high concentrations B (2.5 – 5.0 atomic %) into pre-formed SiQDs predefined sizes while simultaneously maintaining structure...
A study of energy transfer between silicon nanocrystals and dye acceptors revealed features consistent with a Förster mechanism, effects from polydispersity, consequences for quantitative measurements.
Current LED lights are created with quantum dots made of metals like selenium, tellurium, and cadmium which can be toxic. Silicon is used as a non-toxic substance the second most abundant element in earth's crust. When silicon prepared at nanometer size, unique luminesce optical properties emerge that tuned using sized surface chemistry. Therefore, nanoparticles an alternative emitter for lights. To produce hydride-terminated we must synthesize particles. Hydrogen silsesquioxane (HSQ)...
Luminescent colloidal silicon quantum dots (SiQDs) have been explored as alternatives to metal-based QDs for light-emitting diodes (LEDs) because of the abundance and biocompatibility silicon. To date, broad electroluminescence (EL) bandwidth (> 100 nm) blue-shifting EL at high applied voltages SiQD-LEDs outstanding challenges that limited competitive spectral purity device stability. Herein, we report fabrication testing incorporate a Fabry-Pérot cavity exhibit narrow linewidth low ca....
Abstract The discovery of metallic conductivity in polyacetylene [‐HC=CH‐] n upon doping represents a landmark achievement. However, the insolubility and dearth methods for its chemical modification have limited widespread use. Here, we employ ring‐opening metathesis polymerization (ROMP) protocol to prepare functionalized polyacetylenes ( f PAs) bearing: (1) electron‐deficient boryl (‐BR 2 ) phosphoryl (‐P(O)R side chains; (2) electron‐donating amino (‐NR groups, (3) ring‐fused...