Observation of Radiation-Induced Leakage Current Defects in MOS Oxides With Multifrequency Electrically Detected Magnetic Resonance and Near-Zero-Field Magnetoresistance

Extraction of isotropic electron-nuclear hyperfine coupling constants of paramagnetic point defects from near-zero field magnetoresistance spectra via least squares fitting to models developed from the stochastic quantum Liouville equation

“…An interaction distant 29 Si interaction with a Pb center has an isotropic hyperfine coupling constant that ranges between 1.4-1.6 mT. [50][51][52] We find the 1.4 mT electron-nuclear hyperfine constant generated as result of the fit to be consistent with interactions between Pb centers with distant 29 Si while we attribute the 0.2 mT to an interaction with nearby hydrogen.…”

“…From the ratio of the relative contribution scaling factors, we found the relative abundances of the distant 29 Si and nearby hydrogen to be about 7% and 93% respectively. This is consistent with what we would expect at the interface; while the amount of hydrogen is not precisely known, it is reasonable to assume it to be much greater than the number of 29 Si sites.…”

“…We constructed our fitting algorithm to consider two separate recombination paths each with their own isotropic hyperfine coupling constant acting as an adjustable parameter with which to fit the experimental data. The first recombination path describes an electron falling from the intermediate state to a deep level Pb center that is interacting with distant 29 Si while the second path describes an electron falling from the intermediate state to a deep level Pb center that is interacting with nearby hydrogen. The recombination and dissociation rates were tethered together since we assume that these rates should be the same at all Pb centers regardless of the interaction taking place with the Pb center.…”

“…10 During a standard EDMR measurement, a change in current can also be measured when the magnetic field is swept through zero: the NZFMR response. [8][9][10]23,[25][26][27][28][29] The NZFMR response occurs with or without the presence of the oscillating magnetic field. The elimination of the oscillating magnetic field makes the measurement much simpler than conventional EPR and EDMR.…”

“…The small magnetic fields utilized in NZFMR also simplify the measurement. In some systems, the NZFMR response has been shown to closely scale with the amplitude of the EDMR response to the EDMR response in studies of device stressing 25 , radiation damage 10,23,29 , changes in temperature 26 and bias. 9,10,26 Although some analytical results have been extracted from the 6 NZFMR spectrum, no systematic approach has been available with which to obtain information on the strength of the interaction given a defined spin cluster.…”