Publication

Gigarad Ionizing Radiation-Induced Carrier Mobility Degradation in 28 Nm Commercial Cmos

Jean-Michel Sallese
2025

Abstract

This paper presents an experimental study on the impact of total ionizing dose (TID) damage on free carrier mobility in a commercial 28 nm bulk CMOS technology, with exposure levels reaching up to 1 Grad. The analysis is based on a proposed, accurate methodology for extracting free carrier mobility, which assumes drift-diffusion transport in advanced field-effect transistors [1], [2]. Using this approach, we investigate the degradation of carrier mobility caused by Coulomb scattering from radiation-induced interface trapped charges. The study provides new insights into the physical mechanisms behind mobility reduction in deeply scaled nodes under high-dose radiation. The extracted mobility trends offer valuable benchmarks for reliability assessment and radiation-hardened design in nanoscale CMOS technologies.

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https://infoscience.epfl.ch/entities/publication/97b19321-5bc9-4d7a-8ae5-79399d50e8f1

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Jean-Michel Sallese
2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/97b19321-5bc9-4d7a-8ae5-79399d50e8f1

About this result

Related concepts (32)

Ionizing radiation

Ionizing radiation (or ionising radiation), including nuclear radiation, consists of subatomic particles or electromagnetic waves that have sufficient energy to ionize atoms or molecules by detaching electrons from them. Some particles can travel up to 99% of the speed of light, and the electromagnetic waves are on the high-energy portion of the electromagnetic spectrum. Gamma rays, X-rays, and the higher energy ultraviolet part of the electromagnetic spectrum are ionizing radiation, whereas the lower energy ultraviolet, visible light, nearly all types of laser light, infrared, microwaves, and radio waves are non-ionizing radiation.

Absorbed dose

Absorbed dose is a dose quantity which is the measure of the energy deposited in matter by ionizing radiation per unit mass. Absorbed dose is used in the calculation of dose uptake in living tissue in both radiation protection (reduction of harmful effects), and radiology (potential beneficial effects, for example in cancer treatment). It is also used to directly compare the effect of radiation on inanimate matter such as in radiation hardening. The SI unit of measure is the gray (Gy), which is defined as one Joule of energy absorbed per kilogram of matter.

Electron mobility

In solid-state physics, the electron mobility characterises how quickly an electron can move through a metal or semiconductor when pulled by an electric field. There is an analogous quantity for holes, called hole mobility. The term carrier mobility refers in general to both electron and hole mobility. Electron and hole mobility are special cases of electrical mobility of charged particles in a fluid under an applied electric field. When an electric field E is applied across a piece of material, the electrons respond by moving with an average velocity called the drift velocity, .

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