Enhancement of light energy harvesting capability of dye-sensitized solar cells through use of pulse width modulated RGB-LED lamps

In this study, a set of red, green and blue LEDs (RGB LEDs) with a pulse width modulation (PWM) driver circuit are used to fabricate a 5700 K lamp that is used to optimize the light harvesting capability and energy output of dye-sensitized solar cells (DSCCs). By separately controlling the duty cycles of the driving signals of the RGB LEDs, it is demonstrated that the energy harvesting efficiency is elevated by 71.72%. Compared to RGB LEDs driven by direct current, using the RGB LEDs driven by PWM signals helps increase the light energy harvesting efficiency by 137.97%, while LED power consumption is also reduced by 52.38%.