Electron current in excess of the ideal square law occurred in p+-~-Al diodes and was interpreted in terms of double injection mechanism. The drain (Al) potential steps and the Richardson constants for electrons and for holes were determined using the excess electron current, and found to be 4nZ0.504 eV, Rn z 461 A cm-2 K-2 and $p z 0.61 6 eV, RI, z 93 A cm-2 K-2 respectively.
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