An Efficient Photovoltaic Cell Design by Composite of Back Contact EWT Technique and Surface Texturisation

Abstract

Photovoltaic cell is the source of potential energy for the future because it is a renewable energy and pollution free. The potential of photovoltaic cells have not been yet fully tapped due to lack of energy conversion efficiency. However, the recent technology still does not achieve high Watt/m2 and also it is not cost efficient. Nevertheless, accompanied by some losses such as light reflection loss, recombination loss, grid shadowing loss, and low carrier concentration the energy conversion efficiency of a solar cell remains unsatisfactory. Photovoltaic cell technology still needs to be developed and improved further to obtain optimal efficiency at the least cost. A lot of research work has been done and yet been continued in order to enhance the solar cell efficiency. Among them, surface texturization is quite enough achieved to reduce reflectance through light trapping in the cell enhancing higher light absorption. Also back contact, Emitter-Wrap-Through (EWT) cell technology helps to reduce grid loss and enables double-sided carrier collection. This therefore increases short circuit current. However, at present, Emitter-Wrap-Through (EWT) modeling and texture are used individually. In this paper we promote a possible efficient solar cell design by combining these two features along with a PC1D software simulation, thus enhancing the efficiency of PV cell.