Abstract
The mobility crossover phenomenon observed in NH/sub 3/-nitrided N-MOSFET's has been interpreted by the reduced acceptor-type interface states which are located near and above the conduction band edge. However. A direct confirmation of such a hypothesis is not available from the conventional electrical measurement techniques. In this work, for the first time, we used both 1/f noise and random telegraph signal (RTS) measurements which are capable of probing those oxide traps near and above Si conduction band of energy, to study the modification of interface traps induced by N/sub 2/O nitridation. The 1/f noise measurement results confirm that thermal nitridation decreases the near-interface oxide trap density at the higher energy levels, as a result, trapping of the mobile electrons is decreased. The RTS measurement further suggests that thermal nitridation moves the oxide traps farther away from the Si-SiO/sub 2/ interface and thus suppresses the Coulombic scattering of mobile electrons by the trapped charges. Both nitridation-induced interfacial modifications result in enhanced high-field mobility of nitrided-oxide devices over the standard MOS devices. >
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.