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The well known transient ion drift (TID) method is used to quantify the density of mobile Cu interstitial ions in polycrystalline CdTe PV cells. Average Cui+ ion densities in optimally processed cells are 20% of the background ionized acceptor doping level. A preliminary estimate of the diffusion coefficient for Cu i+ ions in the polycrystalline CdTe absorber is D(Cui)=1.3E-6 [cm2/sec] times exp[-0...
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