Department of Physics , College of Science ,University of Baghdad , Baghdad , Iraq
Email: Hosen . 6 oct 2010@ yahoo.com
A photovoltaic cell or other optoelectronic device having a Wide-bandgap semiconductor used in the Window layer. This Wider bandgap is achieved by using a semiconductor com position that is not lattice-matched to the cell layer directly beneath it and/ or to the growth substrate. The Wider bandgap of the Window layer increases the transmission of short Wavelength light into the emitter and base layers of the photovoltaic cell. This in turn increases the current generation in the photovoltaic cell. Additionally, the Wider bandgap of the lattice mismatched Window layer inhibits minority carrier injection and recombination in the Window layer. SiO2 thin ﬁlms have been prepared by RF (Radio Frequency) Sputtering.