In $_x$ Ga $_{1-x}$ N–GaN-Based Solar Cells With a Multiple-Quantum-Well Structure on SiCN

In this letter, the author describes an effective method of obtaining a high photovoltaic efficiency of Inx Ga_1- x N-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 Inx Ga_1- x N-GaN sample. Under an air mass 1.5 global solar spectrum, a maximum photovoltaic efficiency of 5.43% in 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 (V _oc) of 2.86-2.96 V, high short-circuit current densities (J _sc) of 2.40-2.45 mA/cm², and high fill factors of 74.8%-76.5%.