Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 16: Oxide Semiconductors (joint session HL/KFM)

KFM 16.7: Vortrag

Mittwoch, 7. September 2022, 11:15–11:30, H33

Investigation of CuBrxI1−x thin films and CuI bulk material — •Michael Bar1, Evgeny Krüger1, Steffen Blaurock2, Stefan Merker2, Holger von Wenckstern1, Harald Krautscheid2, and Marius Grundmann11Universität Leipzig, Felix-Bloch Institute, Germany — 2Universität Leipzig, Institute of Inorganic Chemistry, Germany

Oxide based wide-bandgap materials with suitable transparency in the visible range are typically unipolar, such that heterostructures are needed for complementary devices. The search for a suitable p-type candidate has led to copper iodide (CuI), which unites transparency in the visible spectral range with exceptional hole mobility, therefore sharing and yet complementing typical properties of oxides. Fabrication methods include sputtering, spin coating and molecular beam epitaxy. [1,2] We present structural, electrical and optical properties of CuI bulk material, and thin films which were grown by pulsed laser deposition (PLD). Furthermore, alloyed thin films of CuBrxI1−x were deposited with a segmented target PLD approach and investigated using x-ray diffraction, transmission and photoluminescence measurements. This PLD approach allows for deposition of thin films in the full composition range using only a single target without the need of sintering. [3] A systematic shift of lattice constants as well as the excitonic features can be observed as function of alloy composition.

[1] C. Yang et al., Proc. Natl. Acad. Sci. USA, 113(46), 12929, (2016).

[2] S. Inagaki et al., Appl. Phys. Lett., 116(19), 192105, (2020).

[3] H. Wenckstern et al., Phys. Stat. Sol. (b), 257(7), 1900626, (2020).

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