Abstract
A section of complete solar cell device consisting of Ag/Al:ZnO/i-ZnO/Cu(In,Ga)Se 2/Mo/glass was in situ annealed inside of TEM column and the interfacial variation was directly investigated in real-time. A pore structure was formed in CdS layer adjacent to CIGS after annealing at 200 °C, and the compositional mapping obtained after 300 °C annealing showed a heavy diffusion of Ga into ZnO layer. Therefore, Ga-assisted Cd diffusion is suggested to be responsible for the pore evolution, which is highly relevant to the device degradation after high temperature annealing.
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