Abstract
The diffusion behavior of Zn in solar-grade (CIGSe) is found to be similar to that in epitaxial (CISe), which indicates that grain boundaries only play a minor role as segregation sites and fast-transport pathways. The diffusivity obeys the Arrhenius equation DZn = 3.8 × 10−3exp(−1.24 eV∕kBT) cm2 s−1. Surprisingly, the diffusion profiles obtained by the radiotracer technique exhibit anomalous shapes with a second maximum near the CI(G)Se-substrate interface. The observations may be indicative of an interstitial-substitutional diffusion mechanism.
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