Modifications of Fowler-Nordheim injection characteristics in {gamma} irradiated MOS devices
- Univ. di Padova (Italy). Dipt. di Elettronica e Informatica
- LPCS/ENSERG, Grenoble (France)
- SGS-THOMSON Microelectronics, Agrate Brianza (Italy)
- CNR-FRAE, Bologna (Italy)
In this work the authors have investigated how gamma irradiation affects the tunneling conduction mechanism of a 20 nm thick oxide in MOS capacitors. The radiation induced positive charge is rapidly compensated by the injected electrons, and does not impact the gate current under positive injection after the first current-voltage measurement. Only a transient stress induced leakage current at low gate bias is observed. Instead, a radiation induced negative charge has been observed near the polysilicon gate, which enhances the gate voltage needed for Fowler-Nordheim conduction at negative gate bias. No time decay of this charge has been observed. Such charges slightly modify the trapping kinetics of negative charge during subsequent electrical stresses performed at constant current condition.
- OSTI ID:
- 644133
- Report Number(s):
- CONF-970934--
- Journal Information:
- IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 3Pt3 Vol. 45; ISSN 0018-9499; ISSN IETNAE
- Country of Publication:
- United States
- Language:
- English
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