Electrical properties of (SN)_x films

The temperature dependence of the thermopower S and the conductivity σ of (SN)x films has been investigated as a function of the substrate temperature during film deposition Ts. In contrast to the transport properties of SNx films previously reported, films made with high Ts have metallic-like transport properties approaching those of (SN)x crystals. For low substrate temperatures σ and S are found to increase strongly with rising temperature and thermopower values up to 0.9 mV/K are observed. This conduction behavior is explained by a heterogeneous model with areas having different electronic gaps. Annealing as well as decomposition effects suggest that the gap width is correlated to the (SN)x chain length. No evidence was seen for superconductivity in these films. © 1978.