Accession Number : ADA289265

Title :   Total Ionizing Dose Effects in MOSFET Devices at 77 K.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Daul, Kevin J.

PDF Url : ADA289265

Report Date : DEC 1994

Pagination or Media Count : 126

Abstract : Total ionizing dose effects on thermal oxide and reoxidized nitrided oxide (RNO) MOSFET devices at 77 K were studied. The MOSFETs were immersed in liquid nitrogen and irradiated, using a Co-60 source, up to 1 Mrad(Si) at a dose rate of 107 rads(Si)/sec. Drain current-gate voltage characteristics were obtained and used to determine threshold voltage and transconductance. At 77 K the subthreshold slopes indicated no observed buildup of interface states in any of the transistors. Furthermore, all transistors experienced very little change in the transconductance. Typical negative shifts in threshold voltage as dose increased were observed in all of the thermal oxide devices. The threshold voltage shifts of the RNO devices were typically less than those for thermal oxide devices.

Descriptors :   *MOSFET SEMICONDUCTORS, *RADIATION DAMAGE, THRESHOLD EFFECTS, THESES, OXIDES, THERMOCHEMISTRY, DOSE RATE, CRYOGENICS, SUBSURFACE, IONIZING RADIATION, TRANSISTORS, TRANSCONDUCTANCE.

Subject Categories : Nuclear Radiation Shield, Protection & Safety
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE