InGaN/GaN Multiple Quantum Well Solar Cells with Good Open-Circuit Voltage and Concentrator Action

Abstract

The photovoltaic properties of large-chip-size (2.5×2.5 mm2) InGaN/GaN multiple quantum well (MQW) solar cells grown by metal organic chemical vapor deposition were studied under concentrated AM1.5G sun irradiation. We demonstrate a high open-circuit voltage of 2.31 V for blue-light-emitting InGaN/GaN MQW solar cells under 1 sun. The higher open-circuit voltage is mainly ascribed to the extremely low reversed saturation current density of approximately 10-19 mA/cm2. The open-circuit voltage and short-circuit current density were found to increase as sunlight intensity increases, with a peak value of 2.50 V observed at 190 suns, showing a great potential for concentrator applications.