Abstract
Transport of mobile ions in n-TiO 2/n-CuInS 2/p-CuInS 2 thin-film devices is studied with the transient ion-drift (TID) method. In contrast to the normal TID method, a mobile ion profile is created in the CuInS 2 layer, which can be described by the Gouy–Chapman theory. Activation energies for diffusion of 0.5 and 1.0 eV are found. We postulate that these activation energies are related to the associated defect, ( Cu In ″ In Cu ) x , which introduces a deep electronic state inside the bandgap of CuInS 2. This defect can accept or release an electron and drift out of the depletion region. This will lower the concentration of recombination centers in the depletion region, which explains the self-healing property of CuInS 2.
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