Cathodoluminescence of Irradiated Hafnium Dioxide

<p>The purpose of this research is to understand the effect of radiation on HfO2 thin films and to compare the quality of HfO2 thin films produced by both atomic layer deposition (ALD) and pulsed laser deposition (PLD); PLD samples had varying substrate temperatures during deposition (300-C 500-C and 750-C). The entirety of this research was conducted using cathodoluminescence (CL) as the examination method. The excitation source was a Kimball Physics EMG-12 electron gun. The photomultiplier tube contained a gallium arsenide photocathode. Measurements were made with beam energies ranging from 1 to 10 keV and beam currents ranging from 30 to 50 ??A both at room temperature and at 7K. The experimentally-determined band gap of HfO2 was consistent with published data but many other features found in the literature were not present in the CL data obtained. HfO2 appeared to be radiation hard up to the levels of radiation to which it was exposed. A higher substrate temperature during deposition for PLD samples produced a better material than lower temperatures. ALD produced a more consistent thickness but PLD ultimately produced a better quality material with respect to the spectrum obtained.</p><p>This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact and remains as true to the original work as possible. Therefore you will see the original copyright references library stamps (as most of these works have been housed in our most important libraries around the world) and other notations in the work.</p><p>This work is in the public domain in the United States of America and possibly other nations. Within the United States you may freely copy and distribute this work as no entity (individual or corporate) has a copyright on the body of the work.</p><p>As a reproduction of a historical artifact this work may contain missing or blurred pages poor pictures errant marks etc. Scholars believe and we concur that this work is important enough to be preserved reproduced and made generally available to the public. We appreciate your support of the preservation process and thank you for being an important part of keeping this knowledge alive and relevant.</p><br>