Investigation and Improvement of Photovoltaic Cells based Zn doped Molybdenum oxide on porous silicon substrates

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Saudi Digital Library
In the context of contributing to the objectives of Saudi Arabia's Vision 2030, which is focused on the invention of renewable energy sources such as photovoltaic cells it was undertaken the improvement into structural, optical, and electrical properties of MoO3 semiconductor to be used in photovoltaic cells with high performances. Initially, it was prepared using the hydrothermal method and doped with different concentrations of zinc to obtain powder in the shape of the nanobelts. XRD analysis revealed that the structure of these samples undergoes a transition from α-MoO3 to β-MoO3 orthorhombic phases. It was noted that MoO3 has a band gap of approximately 2.96 eV. This decreases after the Zn doping percentage to become 2.83 eV for 5%Zn. Then, the effect of depositing 5%Zn doped MoO3 on porous silicon with different etching time on all physical properties was studied. The XRD analysis reveals that these materials have an amorphous structure which can be partially crystallized with the etching time. The photocatalytic analysis indicates that these materials possess distinct optical photocatalytic effects. Following the UV-Vis, SEM, Pl and EIS analysis it was deduced that the etching time in the preparation of the PSi substrates improves the electrical and optical properties which can be used in photovoltaic cells with a high degree of efficiency.