Abstract
Doping of Cu-poor CuInS2 thin films by sodium and oxygen species, such as O2 and O, was investigated by SIMS and conductivity measurements. Increased oxygen concentration is found for Na-doping. The SIMS signals of CuO and CuOS were detected. They coincide for O-doped films but differ for Na and O2 doped films. This is interpreted as due to grain boundary effects. Na doping leads to an increase in lateral conductivity. This finding supports the model previously proposed by L. Kronik, D. Cahen, H.W. Schoek, Adv. Mater. 10 (1998) 31] that oxygen plays a major role in Na doping. The presented results, furthermore, propose oxygen single doping for chalcopyrite films.
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