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DS: Fachverband Dünne Schichten

DS 24: Layer Properties II: Optical Properties

DS 24.5: Vortrag

Mittwoch, 18. März 2020, 12:00–12:15, CHE 91

Tuning of Optical Properties in Highly Conducting Perovskites — •Mahdad Mohammadi, Aldin Radetinac, Thorsten Schneider, Alexey Arzumanov, Philipp Komissinskiy, and Lambert Alff — Institute of Materials Science, Advanced Thin Film Technology, Technische Universität Darmstadt, Darmstadt

The demand for transparent, conducting materials (TCMs) has skyrocketed in the past decades and will further increase due to the development and commercial success of devices like LCDs, capacitive touchscreens and OLEDs. For most TCM applications, doped wide-bandgap semiconductors like ITO (In₂O₃:Sn) are used due to the very good transparency in the visible. However, the conductivity in doped semiconductors is limited by the solubility of dopant elements. Recently, a new type of material has gained attention for application as TCM. The perosvkites SrMO3 (M = V, Mo, Nb) are all highly conducting, with SrMoO₃ (ρ = 5.1 µΩcm) even surpassing the electrode material platinum. In addition, a moderately enhanced electron correlation reduces the plasma frequency ω_p and therefore induces transparency in large parts of the visible spectrum^[1]. The scope of this work is to investigate the materials SrVO₃, SrMoO₃ and SrNbO₃ and related compounds to evaluate how and to what extend the properties can be manipulated towards desired characteristics. For this purpose, epitaxial thin films were deposited via pulsed laser deposition and characterized regarding structural, chemical, optical and electrical properties.
^[1]A. Radetinac et al., J. Appl. Phys., 119, 055302 (2016)