研究目的
To improve the monochromatic conversion efficiency of photovoltaic cells used for optical power transmission by introducing a light trapping configuration that utilizes the unique illumination condition of laser light incident from limited directions.
研究成果
The combination of the front ASF and rear DR on a PV cell used for optical power transmission significantly traps both the normally incident laser light into and radiation from the cell, improving the monochromatic conversion efficiency of a GaAs PV cell by 9% (absolute) compared with that for the ×4n2 trapping, under 872 nm and 1 W cm?2 laser illumination. This configuration does not require two- or three-dimensional nanostructures or lithographic processes and is applicable to PV cells using wider-bandgap materials for higher conversion efficiency.
研究不足
The study omits the issue of series resistance under intense illumination and the surface recombination that is well suppressed by introducing window and back-surface-field layers. The impact of the rear DR reflectivity on the conversion efficiency is notable for the ASF/DR configuration.
