On the role of different paramagnetic centers in conducting nickel oxide thin films

Angela Ebere Ezugwu; Victor Wong; Paul Bazylewski; Giovanni Fanchini

doi:10.1117/12.2509171

1 March 2019 On the role of different paramagnetic centers in conducting nickel oxide thin films

Angela Ebere Ezugwu, Victor Wong, Paul Bazylewski, Giovanni Fanchini

Proceedings Volume 10919, Oxide-based Materials and Devices X; 109191G (2019) https://doi.org/10.1117/12.2509171
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Transparent conducting oxides (TCOs) are extensively investigated because of their applications as transparent electrodes in solar cells and light-emitting devices. TCOs of interest include indium-tin oxide, aluminum-doped zinc oxide, nickel oxide (NiO), and their combinations. There is strong interest in NiO because no heteroatoms are required to “dope” it at high transparency levels. It has been speculated that paramagnetic defects due to Ni³⁺ centers and O interstitials are responsible for the electrical conductivity of otherwise insulating and antiferromagnetic NiO, but direct investigation of such defects has been limited. Here, the electrical conductivity in nanostructured NiO thin films is investigated and correlated to the paramagnetic defect density extracted from electron spin resonance (ESR). Two types of ESR-active centers are identified. Our work points at defect engineering as a necessary step to optimize NiO thin films for their applications as TCOs.

Conference Presentation

Citation Download Citation

Angela Ebere Ezugwu, Victor Wong, Paul Bazylewski, and Giovanni Fanchini "On the role of different paramagnetic centers in conducting nickel oxide thin films", Proc. SPIE 10919, Oxide-based Materials and Devices X, 109191G (1 March 2019); https://doi.org/10.1117/12.2509171

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