With the discovery of observable tunnel emission through thin insulating films, much attention has been focused on this mechanism of current transfer. The importance of space-charge limited current in somewhat thicker films has also been recognized. We have recently observed a third mechanism of current transfer, namely, the high-fie Id emission of hot electrons from a metal into the conduction band of an insulator in contact with it; this process is identical with Schottky emission into the vacuum. 1 The system consists of a thin insulating layer J between two metals M x and M 2 , a voltage V being maintained between the metals (see Fig. 1). The work function between / and M x is

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