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Solar Energy Materials & Solar Cells

  • Photovoltaics

Contactless Characterization of Metastable Defects in Cu(In,Ga)Se2 Solar Cells Using Time-Resolved Photoluminescence

Authors G. El-Hajje, D. Ory, M. Paire, J.-F. Guillemoles, and L. Lombez


The authors present a contactless optical characterization method for the study of metastable defects in Cu(In,Ga)Se2 solar cells. A methodology for the analysis of time-resolved photoluminescence (TRPL) signals is presented. It leads to the observation of a hysteresis phenomenon regarding the minority carrier dynamics following the activation of the metastable defects. The amplitude of the hysteresis phenomena was compared between CIGS solarcells with different absorber/buffer layer interface properties. It is in these particular spatial regions where the metastable defects can be mostly found. The developed contactless characterization method was compared with classical current–voltage measurements. TRPL leads to a more complete understanding of the physics of metastable defects in terms of quantifying the shift in minority charge carriers dynamics that it induces.