Dopant effects on the photoluminescence of interstitial-related centers in ion implanted silicon
This work is supported by a grant from the Australian 
Research Council. B.C.J. is partially supported by the Japan 
Society for the Promotion of Science (JSPS) (Grant-in-aid 
for Scientific Research, 22.00802).
Simulation study of ion implanted defects associated to luminescence centers in silicon
Ion implantation is a technique commonly used in the fabrication of semiconductor devices. The introduction of ions generates a large concentration of defects in the Si lattice. The presence of these defects can adversely affect the device performance. Conversely, in more recent years, ion induced defects have opened the possibility of new Si based optoelectronic devices. The areas which are currently being explored for efficient light emission in Si include luminescence through optically active defect clusters and extended defects. An interstitial related luminescence centre which is often present in ion implanted Si is the W-center. In this work we analyzed by KMC simulations the influence of the presence of B atoms and the annealing temperature on the density of Si interstitial defects in ion implanted samples, which in turn affect the luminescence of the W-center.
Geomagnetic Polarity Epochs: Sierra Nevada Data, 3
Available paleomagnetic and radiometric results for about 60 igneous rocks 3.6 m.y. old or less are consistent with the following geomagnetic polarity epoch time scale: Brunhes normal polarity epoch, 0.0 to 0.85±0.15 million years; Matuyama reversed polarity epoch, 0.85±0.15 to 2.4±0.1 million years; Gauss normal polarity epoch, 2.4±0.1 to 3.35±0.1 million years; Gilbert reversed polarity epoch, 3.35±0.1 million years to (?). A brief interval of normal polarity (the Olduvai event) occurs within the Matuyama reversed epoch at about 1.9 m.y., and a brief interval of reversed polarity (the Mammoth event) occurs within the Gauss normal epoch at about 3.06 m.y. Data for twelve units from eastern California and Nevada, reported here for the first time, are particularly useful in defining the Gauss-Gilbert boundary and for recognizing the Mammoth event.