We have used the fine structure in the Cu K-edge x-ray absorption spectrum to help elucidate the lattice location of Cu in polycrystalline, thin-film CdTe solar cells. In particular, we have studied how the typical CdCl2 vapor treatment in dry air changes the local environment of the Cu in CdTe. We find the Cu absorption spectrum to be similar to that of Cu2Te in the as-deposited CdTe film but to convert to a spectrum similar to Cu2O environment after the vapor CdCl2 treatment.
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Liu, X., Compaan, A.D., Leyarovska, N. et al. Cu K-edge XAFS in CdTe before and after treatment with CdCl2. MRS Online Proceedings Library 763, 35 (2002). https://doi.org/10.1557/PROC-763-B3.5