Analytical model for the optimization of locally contacted solar cells

An empiric analytical model is presented that describes both, the diode saturation current j₀ and the dark series resistance R_s of the passivated and locally contacted rear side of solar cells. The model is experimentally verified for both, point and stripe contacts. Metallization fractions from 1.0% to 50% are realized in the experiments. The measured values of j₀ and R_s fit the theory within the error of the measurement. We use the modelled j₀ and R_s in a one-dimensional simulation of the solar cell performance, to optimize the rear contact geometry for maximum efficiency.