Dr
Ezekiel Omotoso
(Obafemi Awolowo University, Ile-Ife, Nigeria)
11/11/2019, 17:00
Materials
Poster
The capture barrier energy of the E-center deep level defect induced in Pd/Sb-doped Ge by alpha-particle irradiation has been studied. Palladium Schottky barrier diodes (SBDs) fabricated by resistive evaporation technique were successfully characterised by current-voltage (I-V), capacitance-voltage (C-V), conventional and Laplace deep level transient spectroscopy (DLTS). The rectification...
Mr
Masilo Ramafemo
(University of Witwatersrand)
11/11/2019, 17:00
Materials
Poster
Bismuth-oxide based electrolytes are well known for their high oxide ion conductivity at intermediate temperatures (300-700°C). Indeed, the defect fluorite structured δ-phase of Bi2O3 shows the highest known oxide ion conductivity of any material. Unfortunately, this phase is only stable above 730°C and much research has been carried out on stabilizing this phase to lower temperatures through...
Ms
Michelle Thiebaut
(University if the Witwatersrand, School of Chemistry, Materials for Energy Research Group, DST-NRF Centre of Excellence in Strong Materials (DST – NRF CoE-SM))
11/11/2019, 17:00
Materials
Poster
Lithium ion batteries convert chemical energy into electrical energy and the process is reversible making them suitable for energy storage systems.(1) Having efficient and long term storage devices allows for increased use of sustainable energy sources. The cathode material remains the largest focus area for the improvement of the battery performance (2) and any structural changes of the...
Ms
Gugulethu Nkala
(Molecular Science Institute, School of Chemistry, University of the Witwatersrand, private bag X3, Johannesburg, 2050, South Africa)
11/11/2019, 17:00
Materials
Poster
NASICON-type materials such as rhombohedral LiTi2(PO4)3 (LTP), belonging to the R-3c space group, have been studied as potential solid-state electrolytes because of their thermal and chemical stability, as well high ionic diffusion attributed to their 3D framework consisting of TiO6 octahedra, corner-linked to PO4 tetrahedra, allowing for fast transportation of Li+ cations. [1] However, the...
Dr
wilfred Mbiombi
(wits university)
11/11/2019, 17:00
Materials
Poster
Diamond-like carbon (DLC) thin film is an amorphous carbon consisting of sp3 bonded and sp2 bonded carbon, and in addition contain up to several tens atomic percent of hydrogen. it can be used as protective anti –reflecting coatings for basic silicon solar cells to enhance the cell efficiency. On the other hand, it can be changed the opto-electronic and mechanical properties that depend on...
Mr
Olayinka Oluwatosin Abegunde
(University of Johannesburg)
11/11/2019, 17:00
Materials
Poster
TiC thin film has many industrial and scientific applications due to its favourable properties. In this study, TiC thin film was deposited on Ti6Al4V alloy substrate to improve the surface properties. Structural characterization of the evolving properties was carried out. Grazing incidence X-ray diffractometer GIXRD was used to determine the crystallographic structure of the film. Structural...
Mr
Dennis Malihase
(University of the Witwatersrand)
11/11/2019, 17:00
Materials
Poster
The demand for electricity is rapidly growing in developing countries and electrochemical devices such as solid oxide fuel cells (SOFCs) have shown promising developments to mitigate the demand. SOFCs are devices that convert chemical fuels (such as CO, H2 and ethanol) directly into electrical energy and this process is more efficient than any combustion process. They reduce the dependence on...
Ms
Thalia Carstens
(Stellenbosch University)
11/11/2019, 17:00
Materials
Poster
The discovery of actuating materials, or materials that respond to external stimuli (light, heat, pressure etc.) has shed light on an entirely new area for exploration in the fields of crystal engineering and the chemistry of the solid state. Many of these actuating responses coincide with some sort of phase transformation or solid state reaction. Although the mechanisms of the transformations...
Adam Shnier
(University of Witwatersrand)
11/11/2019, 17:00
Materials
Poster
Hybrid-perovskite solar cells have shown rapid development over the last decade reaching 25.2% efficiency in 2019 [1]. Their commercialization is precluded by device stability. The use of mixed cations to substitute the A-site cation site in the prototypical MAPbX3 has shown to greatly improve stability, tune the bandgap and modify the microstructure of the photoactive layer towards a more...
Mr
Mathias Kiefer
(Wits University)
11/11/2019, 17:00
Materials
Poster
SOFCs have emerged as a leading candidate in the search for an efficient and environmentally friendly source of electrical energy.[1-7] SOFCs are, however, marred by a variety of limitations[1,4,6] which have prevented the widespread commercialization of this technology. Most of these limitations stem from the high operating temperature (typically 800-1000 °C) that is associated with these...
