A5081137183- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Silicon and Solar Cell Technologies
- solar cell performance optimization
- Semiconductor materials and interfaces
- Copper-based nanomaterials and applications
- Thin-Film Transistor Technologies
- Silicon Nanostructures and Photoluminescence
- ZnO doping and properties
- Photovoltaic System Optimization Techniques
- Semiconductor materials and devices
- Advanced Semiconductor Detectors and Materials
- Perovskite Materials and Applications
- Gas Sensing Nanomaterials and Sensors
- Advancements in Semiconductor Devices and Circuit Design
- Nanowire Synthesis and Applications
- Solar Radiation and Photovoltaics
- Conducting polymers and applications
- Transition Metal Oxide Nanomaterials
- Acoustic Wave Resonator Technologies
- TiO2 Photocatalysis and Solar Cells
- Ferroelectric and Piezoelectric Materials
- GaN-based semiconductor devices and materials
- Ga2O3 and related materials
- Advanced ceramic materials synthesis
Center for Research and Advanced Studies of the National Polytechnic Institute
2014-2024
Instituto Politécnico Nacional
2014-2023
Universidad Nacional de Colombia
2019-2022
Instituto de Estudios Avanzados
2014-2021
Centro de Investigación en Materiales Avanzados
1996-2019
The effects of quasi-electric fields, caused by the band-gap variation active semiconductor, upon illumination current density and open-circuit voltage a solar cell will be discussed. In addition, it shown that improvement is possible when gradually increased within space charge region from neutral to hetero-junction interface so dark saturation reduced. Our estimation in case where increases 1.15 eV 1.4 eV, at (of order 0.2 μm), an increase around 80 mV observed with respect single gap...
Polycrystalline nickel titanate thin films were deposited on silicon substrates by the radio-frequency (rf) sputtering method using NiTiO3 targets, which in turn sintered from powders obtained solid state reaction. The deposition parameters such as rf-powers, partial pressures of argon and oxygen, well substrate temperatures optimized to ensure homogeneous stoichiometric composition films. Post-synthesis annealing at suitable time durations was realized stabilize ilmenite structure with...
Structural, electronic and vibrational properties of nanostructured (NiTiO<sub>3</sub>)<sub>n</sub>clusters were calculated by numerical models based on DFT semi-empirical quantum chemistry codes.
Thin films of CdO were prepared by spray pyrolysis using cadmium acetate as the Cd source. The intentionally doped with fluorine adding NH4F in solution. substrate temperature was varied range from 170 to 290 °C while keeping other deposition parameters constant, except concentration solution, which up 8 wt%. structural, optical, and electrical properties studied order obtain, under our experimental conditions, optimal values for temperature. We show that best conditions a photovoltaic...
In this paper, we present a comparative study of photoluminescence and its relation to the structural properties cadmium sulphide (CdS) thin films grown by chemical bath deposition (CBD), close spaced vapour transport, laser ablation (LA) sputtering. Taking into account that physical CdS depend upon growth technique optimization conditions for each technique, show best crystal perfection occurs LA-CdS since main peak at low temperature is due bound excitons (2.53 eV). As expected, with worst...
Polycrystalline thin film solar cells made with absorber materials such as CdTe, CIGS, CZTS and metalorganic halides (perovskites) are currently important alternatives for the silicon cell technology, which still dominates photovoltaic market. Then, it is to have tools can be used design this kind of cells. For purpose, we developed a unified simple analytical model that applied The based on basic physics hetero-junction devices, but takes into consideration space charge region extend along...
Modelling solar cells has, in recent years, become a fundamental tool for their optimum design. Here, we present an optical study of CuInGaSe2 (CIGS) order to improve them by selecting the appropriate transparent conductive oxide (TCO) layer thickness. The system interest our case was glass/TCO/CdS/CIGS/Mo, considering radiation incident perpendicular cell from glass and taking into account absorbent nature TCO, CdS CIGS layers. reflectance this layered calculated using matrix method three...
The present study reports the synthesis of colloidal Cu 2 ZnSnS 4 (CZTS) nanocrystals (average size ~4–9 nm) by a simple and low cost hot-injection method. These form larger particles with sizes around 40 nm. Oleylamine (OLA) was used as both solvent nanocrystal stabilizer. effect time on structural, compositional, morphological, optical properties studied. As revealed XRD, Raman, TEM measurements all prepared samples are comprised kesterite wurtzite CZTS nanocrystals. phase contribution...