Design and characterisation of a power amplifier using GaN technology

Modeling of radiation effects in GaN components

Radiations from space or from environments related produce failures and accelerates the lifetime of electronic components. Ionization and charges produced during irradiations disrupt the operation of system electronics in a transient or cumulative way. This produces transients leading to drifts of the characteristics of the electronic components. It is essential to evaluate the densities of charge carriers generated by radiation in the sensitive parts of the components which transform the induced charges into a transient signal ("Single Event") and the insulators in which increasing quantities of charges can be trapped, which will lead to failures over time (cumulative dose). The accurate modeling of particle transport (electrons, protons and ions) in microelectronic materials is essential to better estimate the deposition in the sensitive volumes of elementary structures of electronics. In this context, the CEA in partnership with ONERA has developed, during several PhD, the MicroElec module implemented in the Geant4 framework (international collaboration see dedicated to the transport of particles in matter. This module allows to estimate the spatial distribution of the charges induced by the particle range in the active material of microelectronic transistors. Currently, the MicroElec module deals with 11 materials suitable for modern Silicon microelectronics.
Over the past few years, R&D in GaN components has made significant progress in terms of performance, reliability and cost. GaN technology is now of industrial interest even for applications to be used with radiations and a high level of reliability. However, today, some materials used in GaN technology electronics are not taken into account in MicroElec. Thus, the PhD student will contribute to the extension of the list of MicroElec materials, which will be proposed to the scientific research community of the Geant4 international collaboration where the supervisors of this thesis participate. The models developed will be compared with the results of tests carried out in the laboratory, which the candidate may attend or participate in. The TCAD (Technology Computer-Aided Design) tools of the laboratory will be used to reproduce the electronic effects of the perturbations evaluated by MicroElec in the electronic components.

Modeling of electronic components and functions in a radiative environment