Absorption properties of organic tandem solar cells for different wavelengths by computational simulation

Abstract

In this work, we have been investigating an organic tandem solar cell composed of P3HT:PCBM and CuPc:C60 by using optical modeling and a simulation method to investigate the optimal design for different wavelengths. Energy dissipation flow per time is an important factor that can represent the absorption process in solar cells and plays an important role as a main source for exciton generation. The distribution of energy dissipation in terms of z, the distance in depth of the active‐layer thickness, was analyzed for the different wavelengths. From the simulation, photon‐absorbed profiles were derived in terms of front and back active‐layer thicknesses for different wavelengths. In ideal tandem solar cells, with a series configuration, each subcell must be engineered so that photocurrent can be accurately controlled by light absorption to balance the system. For this reason, in order to find the materials with appropriated absorption, we have identified a set of parameters including optical constants so that it gives an indication of the materials with desirable matching for an active layer with optimal thickness.

Effect of the additional anode layers on the absorption enhancement characteristic of plasmonic organic solar cells

“…Although the maximum optical absorption can be obtained when the thickness of the PEDOT:PSS layer is zero, we set the thickness of the PEDOT:PSS layer to be considering the electrical conductivity and referring to the literature. 35,36) Finally, we calculate the integrated absorbance in the active layer at various thicknesses of the ITO layer. The thickness is determined to be T i = 100 nm, which corresponds to the first Fabry-Perot maximum.…”