Optimization of film structure for wide angle incident light for hybridization of photovoltaic and solar thermal power generation

Abstract

By appropriately determining each layer's refractive index and film thickness, optical multilayer films can control the light spectrum using the interference effect of light. Combining solar and thermal power generation is possible using a heliostat with an optical multi-layer film attached to a solar cell panel in a tower-concentrated solar power generation facility. This research aims to design a super multilayer film that can control wide-angle and wide-band wavelengths based on the spectral sensitivity characteristics of solar cells. It is formulated as an optimization problem that seeks the optimum values of parameters such as the reflection center wavelength of one structural unit, the number of layers, and the incident angle. Design results for the case where the super multilayer film is attached to the back surface of the cover glass of the solar cell are reported.