Ta/anodized Ta2 O5/Al is used as metal-insulator-metal (MIM) element, in experiments. The current -voltage (I-V) characteristic of the MIM element depends on the chamber pressure in heat-treating anodixed Ta2 O5 film. Good nonlinear I-V characteristic has been obtained in the pressure range from 10-2 to 10-4 Torr. Meanwhile, the conductivity coefficient α of the Poole-Frenkel (PF) equation which describes the I-V characteristic can be regulated by about two orders of magnitude in this pressure range, while the non-linearity coefficient β of the PF equation is not affected by the chamber pressure. * Supported by the National Natural Science Foundation of China under Grant Nos, C9576012 and 59631060.
ASJC Scopus subject areas
- Physics and Astronomy(all)