Role of defects and their complexes on the dependence of photoconductivity on dark resistivity of single ZnO microwires

Abstract

We have studied the correlation between the photoconductivity and the dark resistivity of single ZnO microwires. We found that as-grown microwires with higher dark resistivities have higher photoconductivities. However, when the microwires are thermal treated in vacuum, this correlation is inverted. We have also analyzed the behavior of photoconductivity on protonated as-grown samples. We discuss the origin of these behaviors in terms of the interplay of oxygen and zinc vacancies and their complexes acting as recombination or trapping centers. Published by AIP Publishing.

Quantitative characterization of the long-term charge storage of a ZnO-based nanorod array film through persistent photoconductance

“…Since V 0 O has a small capture cross section, the possibility of electrons being captured by V 0 O is slim, signifying that V 0 O might be the centre for charge storage. Obviously, those processes come up during the UV Zn , sub-process (12); oxygen desorption by surface trapped holes, sub-process (13); photogenerated electrons are captured by surface adsorbed oxygen molecules, sub-process (18); donor-acceptor transition involving V O + and V Zn À , subprocess (17); photoexcitation of Cu 0…”

“…, sub-process (15); photogenerated electrons are captured by photoionized V O + , sub-process (16); donor-acceptor transition involving V O + and V Zn À , sub-process (17); photogenerated electrons captured by surface adsorbed oxygen molecules, sub-process (18); the recombination of free holes and electrons captured by Cu 0…”

Effect of Doping and Morphology on UV Emission in Low‐Dimensional ZnO:Na Structures

“…It is widely accepted that for any of its mentioned technological applications, it is crucial to gain further understanding about the role of the native defects, the impurities or dopants in the ZnO physical properties at and beyond room temperature. In this researche line, our investigation is particularly motivated by the renewed interest of the role of defects in the observed room temperature magnetic order and in optic and electronic properties …”

Propiedades magnéticas de óxidos modificados por implantación de iones livianos de baja energía

“…Los microhilos de ZnO se prepararon mediante el proceso carbotérmico consistente en la descomposición térmica de ZnO de alto punto de fusión (2248 K) en Zn o subóxidos de Zn de bajo punto de fusión (692 K). Para la evaporación carbotérmica (Villafuerte et al 2017) se colocó un blanco de ZnO/grafito prensado (relación de masa de 1: 1) en un soporte de cerámico y se emplazó dentro de un tubo de cuarzo. Cuando la temperatura de un horno tubular programable alcanzó los 1423 K, se insertó el tubo de cuarzo.…”

“…Como puede verse en la figura 3.13b, los microhilos obtenidos tienen forma hexagonal con superficies planas. Imagen que muestra la superficie hexagonal facetada de uno de los microhilos irradiados en esta tesis (Villafuerte et al 2017).…”