A5035363012- ZnO doping and properties
- Chalcogenide Semiconductor Thin Films
- Copper-based nanomaterials and applications
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Transition Metal Oxide Nanomaterials
- Semiconductor materials and interfaces
- Solar Thermal and Photovoltaic Systems
- Silicon Carbide Semiconductor Technologies
- Semiconductor materials and devices
- Silicon and Solar Cell Technologies
- Ga2O3 and related materials
- Career Development and Diversity
- Thin-Film Transistor Technologies
- Aluminum Alloys Composites Properties
- Science Education and Perceptions
- Biotechnology and Related Fields
- Biomedical and Engineering Education
- Thermal Radiation and Cooling Technologies
- Metal Alloys Wear and Properties
- Copper Interconnects and Reliability
- Solar Radiation and Photovoltaics
- Science, Research, and Medicine
- solar cell performance optimization
- Advanced Semiconductor Detectors and Materials
University of Dar es Salaam
2012-2024
Port Elizabeth Provincial Hospital
2001-2004
This study reports on the influence of substrate temperature properties Ag-doped TiO2 thin films. The films were deposited by reactive DC co-sputtering Ti and Ag targets at different temperatures target sputtering powers. Grazing incident X-ray diffractometer confirmed that all polycrystalline with dominant peak oriented along (101) planes representing anatase phase. average grain size samples improved increase in deposition temperature. At a 450, had rutile phase, suggesting partial...
Solar collectors may receive significantly more solar radiation if some kind of Sun tracking is utilised. Optimal collector tilt angles, however, depend on the geographic location and other parameters including insolation for site. In this study, daily, monthly, biannual annual optimum angles are calculated using a angle-latitude relation model. The data then used to obtain monthly yearly through weighted averages considering fluctuations in radiation. angle Dar es Salaam found be 5.3°...
Several studies have attempted to overcome the sudden volume expansion of precursor during sulfurization by use oxygen-containing precursors when growing CZTS absorber. This work demonstrates influence stacking orders on properties thin film absorber layer from DC-sputtered oxygenated for solar cell applications. layers were prepared three types stacks, namely, Zn-O/Sn/Cu, Sn/Zn-O/Cu, and Sn/Cu/Zn-O. The sequentially deposited a soda lime glass (SLG) using DC-magnetron sputtering annealed in...
Herein, ultrathin Al 2 O 3 is investigated as a rear interface passivation layer for kesterite solar cells with F:SnO (FTO) back contact potential performance improvement. On the layer, thin Mo deposited to improve FTO's ohmicity. Further, NaF evaporated on copper zinc tin sulfide (CZTS) precursors create openings at and achieve Na‐induced benefits in absorber. The CZTS absorbers directly ‐coated FTO peel off, while those interlayer do not. For pure devices, reduces short‐circuit current...
In this paper, a comparative study of the thermal stability Ru, Pd and to lesser extent Al Schottky contacts p-type 6H-SiC influence hydrogen plasma treatment on these systems is presented. Ohmic were prepared by thermally evaporating (180 nm) followed Ti (50 back surface SiC. subsequently formed polished top ∼0.8 mm diameter dots, 40 nm in thickness, through metal contact mask. Isochronal (15 min) anneals revealed general improvement SBD quality for temperatures up 400 °C case Ru 300 Pd,...
We report on the passivation by hydrogen and subsequent thermal reactivation of acceptors in Al-doped p-type 6H-SiC. Capacitance-voltage measurements revealed that near-surface free carrier concentration was reduced at least an order magnitude after plasma treatment. The stability Al-H complex hydrogenated SiC investigated through a series isothermal anneals temperatures ranging from 200 to 275 °C, while applying reverse bias Ru Schottky barrier. chosen as barrier metal for both its...
ZnO-based transparent and conducting oxides (TCOs) are commonly used as a window layer in thin-film solar cells. However, TCOs with high transparency the visible near-infrared parts of electromagnetic spectrum, plus excellent electrical properties required this application. In study, based on ZnO:B films deposited by DC reactive sputtering using Zn:B alloy target were investigated. The impact deposition temperature growth physical was examined. Structural, optical these investigated means...
Chromium thin films exhibit several properties that make them potential for solar thermal applications. In this work the effect of film thickness and sputtering power based multilayer structure on optical DC sputtered chromium is reported. The structural, topological, these were determined by X-ray diffractometer, Atomic Force Microscopy, Ultraviolet-Visible-Near Infrared spectrophotometer, respectively. XRD spectra revealed a single peak with preferential orientation (200) (210) layer...