Multi-Timescale Microscopic Theory for Radiation Degradation of Electronic and Optoelectronic Devices
Danhong Huang, Fei Gao, D.A. Cardimona, C.P. Morath and V.M. Cowan
DOI : 10.3844/ajssp.2015.3.27
American Journal of Space Science
Volume 3, Issue 1
A multi-timescale hybrid model is proposed to studymicroscopically the degraded performance of electronic devices, covering threeindividual stages of radiation effects studies, including ultra-fastdisplacement cascade, intermediate defect stabilization and cluster formation,as well as slow defect reaction and migration. Realistic interatomic potentialsare employed in molecular-dynamics calculations for the first two stages up to100 ns as well as for the system composed of layers with thicknesses ofhundreds of times the lattice constant. These quasi-steady-state results for individuallayers are input into a rate-diffusion theory as initial conditions tocalculate the steady-state distribution of point defects in a mesoscopic-scalelayered-structure system, including planar biased dislocation loops andspherical neutral voids, on a much longer time scale. Assisted by thedensity-functional theory for specifying electronic properties of pointdefects, the resulting spatial distributions of these defects and clusters aretaken into account in studying thedegradation of electronic and optoelectronic devices, e.g., carriermomentum-relaxation time, defect-mediated non-radiative recombination,defect-assisted tunneling of electrons and defect or charged-defect Ramanscattering as well. Such theoretical studies are expected to be crucial infully understanding the physical mechanism for identifying defect species,performance degradations in field-effect transistors, photo-detectors,light-emitting diodes and solar cells and in the development of effectivemitigation methods during their microscopic structure design stages.
© 2015 Danhong Huang, Fei Gao, D.A. Cardimona, C.P. Morath and V.M. Cowan. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.