New observation and the modeling of gate and drain currents in off-state p-MOSFET's
Abstract
New observations concerning the gate and drain currents measured at off-state conditions in buried-type p-channel LDD MOSFET devices are presented. Detailed investigation of the observed phenomena reveals that: (1) the drain current can be separated into two distinct components: band-to-band tunneling in the gate-to-drain overlap region and collection of holes generated via impact ionization by electrons inside the oxide; and (2) the gate current can be separated into two distinct components: the hot electron injection into the oxide and the Fowler-Nordheim electron tunneling through the oxide. At low negative drain voltage, the dominant component of the drain current is the hole generation inside the oxide. At high negative drain voltage, the drain current is essentially due to band-to-band tunneling, and it is correlated with the hot-electron injection-induced gate current.
- Publication:
-
IEEE Transactions on Electron Devices
- Pub Date:
- May 1994
- DOI:
- 10.1109/16.285025
- Bibcode:
- 1994ITED...41..734C
- Keywords:
-
- Electric Current;
- Electron Tunneling;
- Field Effect Transistors;
- Gates (Circuits);
- Hot Electrons;
- Doped Crystals;
- Electrical Measurement;
- Ionization;
- Oxides;
- Electronics and Electrical Engineering