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Articles by M.U. Onuu
Total Records ( 2 ) for M.U. Onuu
  E.L. Efurumibe , A.D. Asiegbu and M.U. Onuu
  In this study mathematical model of electron transport through the anode (TiO2) of a standard dye-sensitized solar cell was developed. The modeling led to the generation of a set of differential equations and a linear equation. The linear equation relates the rates of electron emission, α from the sensitized Dye, rate of electron trapping, β by TiO2 and the rate of electron diffusion, γ through the TiO2. The linear equation was transformed such that it could compare the rate of electron trapping, β with the thickness, T of the TiO2. The aim of the research was to determine the parameters of TiO2 that influences its electron trapping. The specific objective was to look at the relationship between the rate of electron trapping by the anode and the thickness of the anode. The set of differential equations were solved jointly using two different methods: the Euler’s method and the Runge-Kutta’s method. Result showed that the size (thickness) of TiO2 influences its electron trapping rate. And the solution to the system of differential equation showed that the thickness of the TiO2 deteriorate with time. So from the result obtained, the recommendation is that the size of the anode use in the design of Dye-sensitized solar cell should be increased in order to improve the efficiency of the standard dye-sensitized solar cell. By improving electron transmission through the anode, we are invariably improving the efficiency of the solar cell.
  E.L. Efurumibe , A.D. Asiegbu and M.U. Onuu
  Titanium dioxide is an important raw material for the fabrication of the anode of a dye-sensitized solar cell. The fact it that electrons are trapped within this anode as they flow through it. These trapped electrons tend to set the atoms of titanium dioxide into vibration. Here this vibration (interaction) has been investigated. The aim of the research was to generate the dispersion relation owing to the interaction between the atoms of titanium and oxygen in a unit cell of the crystal of TiO2. Certain assumptions were made before formulation the mathematical mode that generated the dispersion relation. The result showed a dispersion relation at various angular steps.
 
 
 
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