Rectification was observed on polycrystalline samples of metalhyphen;free, copper, nickel, and molybdenum phthalocyanines when these materials were sandwiched between different metal electrodes. The presence of a small amount of a liquid polar impurity proved essential for rectification, and it is suggested that the observed rectification is caused by the formation of an ionic spacehyphen;charge barrier in the vicinity of the least noble electrode. The highest rectification ratio observed was 500 and was obtained with copper phthalocyanine between a platinum and a silver electrode and also between a silver and an aluminum electrode. The effects of temperature, electrode material, and electrode size on the rectification ratio are given.
展开▼
