Effect of an Incoherent Glass Substrate on the Absorption Efficiency of Organic Solar Cells at Oblique Incidence Analyzed by the Transfer Matrix Method with a Glass Factor

Abstract

We theoretically investigate the effect of the incoherent glass substrate on the absorption efficiency of organic solar cells (OSCs) at oblique incidence. The light propagation in the mixed incoherent glass substrate and coherent multilayer is calculated based on the transfer matrix method with a simple correction factor, which is derived at oblique incidence by taking multiple reflections inside the glass substrate. The validity of the proposed method is demonstrated by comparing the calculation results with those obtained by the generalized transfer matrix method. We investigate how the multiple reflections within the incoherent glass substrate affect the light absorption efficiency of thin-film OSCs, depending on the incidence angle and polarization.