Circuit Modeling of Waveguide Grating Nanostructures in Ultrathin Solar Cells

In this paper, a circuit modeling is used to investigate the effects of waveguide grating nanostructures on the performance of ultrathin solar cells. The proposed method is based on transmission line equivalent circuit (TLEC) and it is identified for both of the transverse electric and transverse magnetic polarizations. Under assumption of weak-coupling condition, this method can effectively describe the absorption inside ultrathin solar cells with the one-dimensional grating nanostructure etched into the anti-reflection coating layers. The proposed approach consists of two different circuits accounting for the background and scattering fields. The final result of the TLEC method comprises of the superposition of the background and scattering TLEC circuits.