Amonrat Kerdpradist, A. Ruangphanit, W. Titiroongruang, R. Muanghlua
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The Effect of Gamma Irradiation on Threshold Voltage and Channel Mobility Degradation of NMOS
This paper presents the effect of Gamma Irradiated on threshold voltage, surface mobility and transconductance on N-channel MOSFET devices at a gate oxide thickness of 15 nanometers, which is fabricated at Thai Microelectronics Center by 0.8-micron CMOS technology. Then gamma irradiation (Co-60) at a total dose varied from 1 to 10 $\mathbf{kGy}$. By performing five rounds to observe changes in threshold voltage when the devices were exposed to gamma rays for measurement to extraction threshold Voltage (VTH) into the surface mobility $(Uo)$ from IDSVs VGs curves in the saturation region. As a result, the threshold Voltage reduces at highest dose by approximately 38% compared with conventional N-channel MOSFET, for a parameter extraction in the level 3 model for MOSFET SPICE parameters is presented.
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