Performance enhancement methods of an ultra-thin silicon solar cell using different shapes of back grating and angle of incidence light

The goal of this research is to evaluate the efficiency dependence of a silicon based ultra-thin film solar cell on angle of incident of light. Here, the optical path length of incoming light inside the active layer is increased using a distributed Bragg reflector (DBR) and a rectangular, triangular or cylindrical shaped grating horizontally arranged and place on top of DBR. This arrangement of DBR and horizontal grating is used to control the light inside the absorber. It is shown that by implementing these structures, it is possible to enhance the efficiency of a 3 mu m thin silicon solar cell near up to %20. In addition, when incidence angles of 0 degrees-30 degrees are considered, it is learned that cylindrical shaped backside reflector, when is combined with the DBR results in best efficiency.