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While ultra-thin (<1µ) semiconductor layers result in poorer cell performances due to shunting, incomplete photon absorption and interference between the main and the back contact  junction \cite{Paudel_2012}, they are cheaper from a material point view. If efficent light trapping techniques are used, the absortion efficency can be increased allowing for minimal loss. Intead of 1-2 µm thin films, 100nm could be adequete for CdTe.  ## Post-growth treatments and electron absorbers  The "CdCl2" treatment or “activation” process, while poorly understood is a treatment that consists of growth or post-growth heat treatment of CdTe layers in the presence of CdCl2 or halogens (mostly, chlorine, and fluorine) molecules, atoms or ions.  (a)  CdTe grain enhancement; (b) enhanced interdiffusion between CdTe and CdS (that leads to the