Lennard-Jones Centre for Computational Materials Science

Impact of amorphization on the electronic properties of Zn-Ir-O systems.

Muñoz Ramo, D and Bristowe, PD (2016) Impact of amorphization on the electronic properties of Zn-Ir-O systems. J Phys Condens Matter, 28. p. 345502.

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Abstract

We analyze the geometry and electronic structure of a series of amorphous Zn-Ir-O systems using classical molecular dynamics followed by density functional theory taking into account two different charge states of Ir (+3 and +4). The structures obtained consist of a matrix of interconnected metal-oxygen polyhedra, with Zn adopting preferentially a coordination of 4 and Ir a mixture of coordinations between 4 and 6 that depend on the charge state of Ir and its concentration. The amorphous phases display reduced band gaps compared to crystalline ZnIr2O4 and exhibit localized states near the band edges, which harm their transparency and hole mobility. Increasing amounts of Ir in the Ir(4+) phases decrease the band gap further while not altering it significantly in the Ir(3+) phases. The results are consistent with recent transmittance and resistivity measurements.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Unnamed user with email sms67@eng.cam.ac.uk
Date Deposited: 13 Jul 2016 09:36
Last Modified: 17 Jun 2021 15:40
DOI: 10.1088/0953-8984/28/34/345502

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