Role of oxygen interstitials in Zn1-xGaxO for faster response to UV light

TL;DR

This paper investigates how oxygen interstitials influence the UV light response in Ga-doped ZnO, revealing that doping improves conductivity and photocurrent but affects sensitivity due to defect state changes.

Contribution

It uncovers the role of oxygen interstitials in enhancing response speed and conductivity in Ga-doped ZnO for UV sensing applications.

Findings

Gallium doping improves crystalline quality and conductivity.

Oxygen interstitials control sensing speed by affecting defect states.

Photocurrent increases with Ga incorporation, impacting sensitivity.

Abstract

ZnO doped with Gallium (Ga3+) demonstrates better crystalline nature and conductivity increases. Latent defect states are suppressed. However, due to the larger charge of Ga3+ oxygen interstitials are generated which control the sensing speed. The conductance increases as a consequence of reduced defect states, especially the oxygen vacancies. The photocurrent increases with Galium incorporation, but a more intense increase in the current reduces the sensitivity.