Study on non-destructive identification of gallium concentration gradients in Cu(In, Ga)Se2 solar cells and their efficiency impact

摘要

The concentration gradient of gallium within the absorber layer is known to play an important role for the efficiency of Cu(In, Ga)Se2 solar cells. A promising method for their non-destructive analysis is angle-resolved x-ray fluorescence analysis. We present an investigation of the effect of different gallium concentration gradients on fundamental parameter-based calculations of the fluorescence spectra in comparison to their influence on the solar cell efficiency as derived by device simulations. The aim is to determine the ability of the analytical method to detect gradient variations relevant for solar cell performance.