Aller au menu Aller au contenu
Physico chemistry of solids, thin films, biotechnologies
Applications for micro & nano- technologies, energy, health ...

> Research > Research-FunSurf

Materials Horizons by Viet Nguyen 2018

Published on May 24, 2018
A+Augmenter la taille du texteA-Réduire la taille du texteImprimer le documentTélécharger au format PDFEnvoyer cette page par mail Partagez cet article Facebook Twitter Linked In Google+ Viadeo
Communique from April 27, 2018 to May 24, 2018

The paper "Electron tunneling through grain boundaries in transparent conductive oxides and implications for electrical conductivity" has been published in Materials Horizons.

viets.jpg

viets.jpg

Here  you will find Viet Nguyen's paper.
"In this work, we have applied the Airy Function Transfer-Matrix Method to provide a numerical description of the charge scattering mechanisms taking place at the grain boundaries in polycrystalline, degenerately Al-doped ZnO (ZnO:Al) films, one of the most studied Transparent Conductive Oxides (TCOs). By discretizing the potential barrier at the grain boundary into linear segments, an accurate calculation of the electron tunneling probability through the grain boundaries have been obtained. Conversely to analytical models based on the Wentzel–Kramers–Brillouin (WKB) approximation, our new approach is valid for any doping level. We thus provide a complete model that allows a comprehensive explanation for carrier transport in highly doped semiconductors, for which charge tunneling across grain boundaries cannot be neglected. We have tested our model with ZnO:Al thin films prepared by different physical and chemical deposition techniques, namely, sputtering, atomic layer deposition and atmospheric pressure spatial atomic layer deposition. A linear relationship between trap density at the grain boundaries and carrier density has been extracted by fitting our model to Hall mobility data for the different samples. Our results provide a guidance on how to adapt the deposition conditions to obtain high-quality materials, with an optimum ratio between optical and electrical properties as required for specific applications."


A+Augmenter la taille du texteA-Réduire la taille du texteImprimer le documentTélécharger au format PDFEnvoyer cette page par mail Partagez cet article Facebook Twitter Linked In Google+ Viadeo

Written by David Munoz-Rojas

Date of update May 24, 2018

Communauté Université Grenoble Alpes