Reflections on the Use of Density Functional Theory in the Understanding of the Effects of Moderate

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Reflections on the Use of Density Functional Theory in the Understanding of the Effects of Moderate Amounts of Sulfur Substitutional Impurities on ZnO | Chapter 06 | New Advances in Materials Science and Engineering Vol. 1

A theoretical study on the effects of a moderate amount of sulfur when used as substituent impurity in place of oxygen in zinc oxide at its crystal form using Density Functional Theory (DFT). S-substituent amounts in percent go from 0.1% up to 1.0% and we analyze modifications in the crystal properties such as lattice characteristics, total energy, and gap energy. Lattice parameter c increased slightly as S-substituent percent increased, lattice parameter a had an opposite behavior because it decreased as the S-substituent increased and c/a rate had ups and downs but with very slight variation between consecutive values. Total energy calculations showed an increasing trend at all times and binding energy showed a decreasing trend at all times as the substituent percent increase but the variation between consecutive points was small. Gap energy had a decreasing trend with a maximum variation of 6.57% at 1.0% S substituent from pristine ZnO. In order to correct the DFT underestimation of gap energy we applied a correction factor and found a decreasing trend as the substituent percent increase and observed the highest difference from undoped ZnO was 1.42% at 1.0% S-substituent. We study the effects on the ZnO structure occurring when moderate S-substituent amounts from 0.1% to 1.0% are used and provide new knowledge to predict if the geometric and electronic structure changes may be suitable for new applications of ZnO in optoelectronics.

Author(s) Details

Manuel Alberto Flores-Hidalgo
Facultad de Ciencias Qu´ımicas, Universidad Ju´arez del Estado de Durango, Durango, Durango 34120, Mexico.

Diana Barraza-Jim´enez
Facultad de Ciencias Qu´ımicas, Universidad Ju´arez del Estado de Durango, Durango, Durango 34120, Mexico.

Daniel Glossman-Mitnik
Laboratorio Virtual NANOCOSMOS, Departamento de Medio Ambiente y Energ´ıa, Centro de Investi- gaci´on en Materiales Avanzados, Chihuahua, Chih 31136, Mexico.

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