A5063775626- Chalcogenide Semiconductor Thin Films
- Heusler alloys: electronic and magnetic properties
- Quantum Dots Synthesis And Properties
- TiO2 Photocatalysis and Solar Cells
- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and interfaces
- Advanced Thermoelectric Materials and Devices
- Transition Metal Oxide Nanomaterials
- Boron and Carbon Nanomaterials Research
- Copper-based nanomaterials and applications
- Conducting polymers and applications
- MXene and MAX Phase Materials
- 2D Materials and Applications
- Perovskite Materials and Applications
- Electrophoretic Deposition in Materials Science
- Intermetallics and Advanced Alloy Properties
- Organic Electronics and Photovoltaics
- Advanced Semiconductor Detectors and Materials
- Electronic and Structural Properties of Oxides
- Silicon and Solar Cell Technologies
- Metal and Thin Film Mechanics
- Surface and Thin Film Phenomena
- Advanced Welding Techniques Analysis
- Analytical Chemistry and Sensors
University of Nairobi
2014-2024
Moi University
2022
Indian Institute of Technology Mandi
2017
University of Nebraska–Lincoln
2017
Chuka University
2017
German Orient Foundation
2005
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2005
Interfacial modulation is crucial for optimizing charge carrier management and thwarting undesired ion-metal diffusion in perovskite photovoltaics. This study highlights a groundbreaking approach, employing semiconducting perylene-diimide (PDINN) as cathode interlayer (CIL) an inverted tin halide solar cell (THPSC). PDINN imparts the THPSCs with remarkable efficiency rate of 13.05% well substantial stability, achieving best performance among reported thus far. The incorporation improves...
The electronic, mechanical, elastic, dynamical, and optical properties of the ZrCoAs half-Heusler compound have been systematically investigated using plane wave self-consistent field approach with Perdew-Burke-Erzerhof generalized gradient approximation (GGA-PBE) exchange-correlation functional. study includes examinations without spin orbit coupling (SOC) effects. Results indicate a decrease in Kohn-Sham band gap inclusion SOC Electronic bandgap formation was attributed to Co 3d, Zr As 2p...
Aluminum sheets were polished to reduce ruggedness and then textured in varying acid-ethanol concentration etchant form pores. The surface was characterized structurally by using X-ray diffraction (XRD) which revealed aluminum crystallographic planes (1 1 1), (2 0 0), 2 0) (3 1). Its morphology studied energy dispersive (EDX) scanning electron microscope (SEM) that confirmed purity of sheet be 99.66% at. Reflectance plain analyzed spectrophotometric measurements showed texturing reduced the...
<b> </b><b> </b>Undoped and nitrogen-doped titanium dioxide (TiO2) thin films of 400 nm thick deposited by spray pyrolysis were structurally optically characterized. The effect substrate temperature on the optical properties was also investigated. Structural studies undertaken X-ray diffraction (XRD). Energy dispersive (EDX) spectrum analysis used to confirm presence nitrogen atoms in film after doping. such as refractive index (n), energy band gap (Eg) Urbach (Eu) determined from...
The study investigates the impact of Hubbard U correction and spin-orbit coupling (SOC) on structural, mechanical, electronic, optical properties Ti[Formula: see text]O[Formula: text] SrTiO[Formula: compounds. research is motivated by potential applications these materials in photovoltaics, with a focus understanding their for such use. ductility, ionicity, mechanical stability both compounds at zero pressure are assessed, indicating as resilient materials. Also, display high refractive...
The most widely used material in electron transport layers (ETL) of inverted organic solar cells (iOSCs) is zinc oxide (ZnO). However, the brittleness, inorganic nature, surface defects, and photocatalytic activity ZnO lead to poor stability iOSCs. Herein, light‐soaking thermal iOSCs are substantially improved by modifying with polyurethane diacrylate (SAR) or urethane acrylate (OCS)‐based ultraviolet (UV) resins. UV resins significantly reduce energy barrier, suppress improve interfacial...
Investigation of the structural, electronic and magnetic properties full-Heusler Co2VIn as well half-Heusler CoVIn Cobalt based Heusler compounds using density functional theory (DFT) leads to general conclusion that are half-metallic materials with a gap at Fermi level in minority states majority respectively. A Hubbard-like Coulomb correlation term U has been included DFT (DFT+U) for computation compounds. The structural have calculated paramagnetic ferromagnetic phases, both found be...
Pd-F:SnO2 thin films have been prepared by spray pyrolysis technique. Optimization has done doping SnO2 with palladium at varying levels of concentration and then recording sheet resistance. The resistivity observed to decrease gradually as at% Pd is increased; an optimum value 2.71 × 10−2 Ω cm recorded. in attributed presence ions which contribute increment charge carrier density. Using the doping, same procedure repeated study effect fluorine on Pd:SnO2; 1.64 10−4 This substitution O−...
Efficient materials with good optoelectronic properties are required for the performance of photovoltaic devices. In this work, we present findings a theoretical investigation structural, electronic, elastic, mechanical, and optical K2CuX (X = As, Sb) ternary compounds. The computations were carried out by using density functional theory (DFT) formalism as implemented in quantum espresso (QE) software package. calculated lattice constants 19.1414 a.u (K2CuAs) 20.0041 (K2CuSb) agreement...
In this study, the structural, electronic, mechanical, optical, and thermoelectric properties of cubic half-Heusler compound ZrCoY(Y[bond, double bond]Sb Bi) obtained using first-principles calculations are presented. The following exchange-correlation functionals have been employed: Generalized Gradient Approximation with Perdew-Burke-Ernzerhoff (GGA-PBE), Perdew-Burke-Enzerhoff for solids (GGA-PBESol) Local Density (LDA). Both ZrCoSb ZrCoBi compounds mechanically dynamically stable, based...
In this study, the structural, electronic, elastic, mechanical, and optical properties of a new Zintl phase K2AgAs ternary semiconductor compound have been investigated by first-principles method using plane-wave self-consistence field method. A triangulation different exchange-correlation functionals, including local density approximation-LDA-PZ, generalized gradient approximation (GGA)-Q2D, GGA-BLYP, GGA-Perdew–Burke–Ernzerhof (PBE), GGA-PBESol, GGA-revPBE, utilized to predict material....
Abstract Temperature‐dependent electrical characterization of a highly structured TiO 2 /In(OH) x S y /Pb(OH) /PEDOT:PSS eta solar cell has been carried out. The transport mechanism in this type investigated. A schematic energy band diagram which explains the photoelectrical properties device proposed. characterized temperature range 200–320 K at illumination intensities between 0.05 mW/cm and 100 . diode ideality factor under found to vary 1.2 1.6, whereas dark 6.9 ≤ 10.1. undergo thermally...