Browsing by Author "Modibane, Kwena D."

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    Fabrication, characterization, and photovoltaic performance of titanium dioxide/metal-organic framework composite
    (Elsevier, 2022) Ramaripa, Phuti S.; Modibane, Kwena D.; Ramoroka, Morongwa E.
    The titanium dioxide-metal-organic framework (TiO2−MOF) composite was prepared using the sol-gel method for photovoltaic applications. Raman analyses showed the presence of MOF clusters in the TiO2 sol-gel network. Using the Brunauer-Emmett-Teller method, the resultant composite material exhibited a surface area of 111.10 m2 g−1 as compared to the surface area values of 262.90 and 464.76 m2 g−1 for TiO2 and MOF, respectively. The small optical band gap values of 2.63 for direct electronic transition and 2.70 eV for indirect allowed electronic transition in TiO2/MOF composite were observed using ultraviolet-visible supported by cyclic voltammetry (CV).
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    Photoluminescent Responses of Polypropylenethiophenoimine-Co-Pedot/ Polystyrenesulfonic Acid and Zinc Selenide Quantum Dot Composite Materials
    (University of the Western Cape, 2018) Mdluli, Siyabonga Beizel; Iwuoha, Emmanuel I.; Modibane, Kwena D.
    Research in renewable energy has gained momentum and become a centre of attention as a possible alternative solution to the energy catastrophe. This is attained by the use of solar energy as an alternative clean energy source. The creation of solar energy arises as a consequence of direct conversion of light photons from the sun into electrical energy by the use of solar cells made up of semiconducting materials incorporated into the system. In the context of solar energy, hybrid photovoltaics comprising of organic molecules and nanomaterials have emerged to be one of the most promising candidates to lower the cost of construction of solar cells as well as improving the power conversion efficiency (PCE). This is mainly due to the ease of processability of the active layer and the unique properties brought by the use of nanomaterials. In the exponential increasing wide field of nanotechnology, focus has shifted to novel hybrid dendritic star copolymers as the organic donor materials and quantum dots as the inorganic acceptor materials.