In the framework of a European project, NATCO (Novel Advanced Transparent Conducting Oxides) we are working towards a deeper understanding of the optical properties and conduction mechanism of Cu based TCOs, which are currently the leading p-type TCO candidates. In this contribution, we review and correlate modelling studies and experimental results of optical and electrical properties of SrCu₂O₂. Using first principles modeling we have investigated point defects such as Cu and oxygen vacancies providing insights into the origin of p-type conduction. The experimental optical constants of both bulk and thin films of SrCu₂O₂ over a large spectral range have been inferred from spectroscopic ellipsometry and reflectance/transmission spectrophotometry measurements. Computed and experimental phonon modes obtained from Raman and Fourier Transform Infrared spectroscopy are reported for the tetragonal SrCu₂O₂ phase. In conjunction with XRD and FTIR, Raman measurements provide a more comprehensive understanding of the SrCu₂O₂ thin films crystalline structure. The correlation between optical and microstructural properties and the assignment of infrared and Raman active modes for SrCu₂O₂ in thin films deposited by Pulsed Laser deposition and MOCVD is discussed. Temperature-resolved optical and electrical properties of SrCu₂O₂ thin films will be also presented.

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