High Photovoltaic Efficiency of In_xGa_1-xN/GaN-Based Solar Cells with a Multiple-Quantum-Well Structure on SiCN/Si(111) Substrates

Abstract

In this paper, I describe an effective method of obtaining a high photovoltaic efficiency of InxGa1-xN/GaN-based solar cells with a multiple-quantum-well (MQW) structure using a SiCN/Si (111) substrate. The MQW region had a higher solar cell absorption than the non-MQW InxGa1-xN/GaN sample. Under an air mass 1.5 global solar spectrum, an average increase of 38.5% in the photovoltaic efficiency of the MQW sample over the control sample was observed. It was found that the device and fabrication technology developed in this study are applicable to the realization of solar cells with high open-circuit voltages (Voc) of 2.92 to 3.16 V, high short-circuit current densities (Jsc) of 55.1 to 56.5 mA/cm2, and high fill factors of 89.5 to 91.8%.