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Two-dimensional (2D) materials represent an ultrathin material class with unique properties. For example, graphene as the first 2D material reported combines high electrical conductivity and high transparency making it ideally suited as transparent contact layer in GaN-based LEDs. Graphene has been grown by plasma-enhanced CVD and integrated into GaN-based light emitting devices for the visible and for the UV spectral range by a transfer-free approach. Pronounced lateral current spreading, and a reduced turn-on voltage indicate the suitability of our concept.
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Gerd Bacher, Johanna Meier, Hehe Zhang, Umut Kaya, Wolfgang Mertin, "Graphene as low-absorbent contact layers in GaN-based LEDs," Proc. SPIE PC12906, Light-Emitting Devices, Materials, and Applications XXVIII, PC129060D (13 March 2024); https://doi.org/10.1117/12.2692824