Regensburg 2019 – scientific programme

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DS: Fachverband Dünne Schichten

DS 22: Thin Film Applications

DS 22.2: Talk

Thursday, April 4, 2019, 09:45–10:00, H39

Electrical and optical characterization of the correlated metals AMoO₃ (A = Ca, Sr, Ba) — •Mahdad Mohammadi, Aldin Radetinac, Iliya Radulov, Leopold Diop, Philipp Komissinskiy, and Lambert Alff — Institute of Materials Science, Technische Universität Darmstadt, Darmstadt

Transparent conducting materials (TCMs) are facing a steadily increasing demand for a variety of applications such as capacitive touchscreens, LCDs, solar cells and LEDs. In the majority of devices, ITO, a doped wide-gap semiconductor, is used due to the very good transparency in the visible light spectrum. Recently, correlated metals have gained attention as an alternative material class for application as TCMs. One prominent representative of this material class is the perovskite compound SrMoO₃ [1]. In this work, the influence of the A-site cation on the electrical and optical properties has been investigated by substituting Sr with Ca and Ba. The compounds were epitaxially grown using pulsed-laser deposition and characterized via XRD, XPS, UPS, Hall transport measurements and UV/VIS spectrophotometry. Due to the high conductivity of the molybdates, very thin films in the range of 10-30 nm are sufficient to achieve application relevant sheet resistances below 50 Ω / .This leads to similar transparencies in the visible light spectrum at comparable sheet resistances compared to ITO. Among the three investigated compounds, BaMoO₃ showed the highest transparency with resistivities around 30 µ Ωcm.
A. Radetinac et al., J. Appl. Phys., 119, 055302 (2016)