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Hole current in dual dielectric under positive gate voltage

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3 Author(s)
Yau, L.D. ; Intel Corporation, Aloha, OR ; Liou, F.-T. ; Chen, S.

n-channel dual-dielectric transistors with SiO2:Si3N4gate insulators were fabricated with and without boron implant in the channel. Under positive gate voltage stress, electrons can enter the insulator from the silicon, and holes can enter the silicon from the insulator. The electrons and holes were measured by the technique described by Ginovker et al.[1]. For oxides thicker than 30 Å, it is always observed that the silicon hole current is 3-4 orders of magnitude below the silicon electron current. The physical origin of this hole current is shown to be field-enhanced excitation of electrons from the valence band to the conduction band in the silicon prior to entering the insulator, and is not due to the holes from the insulator entering the silicon.

Published in:

Electron Device Letters, IEEE  (Volume:4 ,  Issue: 8 )

Date of Publication:

Aug 1983

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