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Tatarczak, Piotr; Iwański, Jakub; Dąbrowska, Aleksandra; Tokarczyk, Mateusz; Binder, Johannes; Stępniewski, Roman; Wysmołek, Andrzej, 2023, "Strain modulation of epitaxial h-BN on sapphire: the role of wrinkle formation for large-area two-dimensional materials", https://doi.org/10.18150/CSTOTJ, RepOD, V1
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The experimental data is related to the article: Strain modulation of epitaxial h-BN on sapphire: the role of wrinkle formation for large-area two-dimensional materials
Strain built-in electronic and optoelectronic devices can influence their properties and lifetime. This effect is particularly significant at the interface between two-dimensional materials and substrates. One such material is epitaxial hexagonal boron nitride (h-BN), which is grown at temperatures often exceeding 1000 °C. Due to the high growth temperature, h-BN based devices operating at room temperature can be strongly affected by strain generated during cooling due to the differences in lattice thermal expansion of h-BN and the substrate. Here, we present results of temperature-dependent Raman studies of the in-plane E2ghigh phonon mode in the temperature range of 300 K - 1100 K measured for h-BN grown by metalorganic vapor phase epitaxy. We observe a change, by an order of magnitude, in the rate of the temperature-induced frequency shift for temperatures below 900 K, indicating a strong reduction of the h-BN/substrate interaction. We attribute this behavior to the creation of h-BN wrinkles which results in strain relaxation. This interpretation is supported by the observation that no change of layer/substrate interaction and no wrinkles are observed for delaminated h-BN films transferred onto silicon. Our findings demonstrate that wrinkle formation is an inherent process for two-dimensional materials on foreign substrates that has to be understood to allow for the successful engineering of devices based on epitaxially grown van der Waals heterostructures.
Hexagonal boron nitride, Metalorganic Vapor Phase Epitaxy, Raman spectroscopy, Strain, Thermal expansion, Wrinkles
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