Browsing by Author "Tombe, Sekai Lana"

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    Optical and electronic properties of methylammonium lead halide perovskite solar cells
    (University of the Western Cape, 2017) Tombe, Sekai Lana; Iwuoha, Emmanuel I
    Organic-inorganic hybrid perovskite solar cells have emerged as promising materials for next-generation photovoltaics with certified efficiency of 22.1%. Despite rapid developments, achieving precise control over the morphologies of the perovskite films, enhanced stability and reproducibility of the devices remains challenging. In this work, we employed a low-temperature solution processing technique to attain high efficiency inverted planar heterojunction devices with device architecture ITO/PEDOT:PSS/Perovskite/PCBM/Al (indium doped tin oxide; poly(3,4-ethylenedioxythiophene) polystyrene sulfonate; [6,6]-phenyl-C61-butyric acid methyl ester; aluminium). A perovskite solar cell fabrication technique is developed and opto-electronic characterization of solution-processed planar heterojunction perovskite solar cells based on methylammonium (MA) lead halide derivatives, MAPbI3-xYx (Y = Cl, Br, I) is presented in this thesis work. By employing lead iodide (PbI2) with various amounts of additional methylammonium halides, perovskite precursor solutions were obtained, which were used in the fabrication of four perovskite systems, MAPbI3, MAPbI3-xClx and MAPbI3-xBrx and MAPbBr3. The absorption and photoluminescence (steady state and temperature-dependent) behavior were explored in this compositional space.