Dresden 2026 – scientific programme
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DS: Fachverband Dünne Schichten
DS 14: 2D Materials II (joint session DS/HL)
DS 14.8: Talk
Wednesday, March 11, 2026, 17:00–17:15, REC/C213
Influence of Polymethyl Methacrylate molecular weight on Graphene transfer and its intrinsic properties — •Monika Choudhary1, Rasuole Lukose1, Moriom Akter1, Christian Wenger1,2, and Mindaugas Lukosius1 — 1Leibniz-Institut für Innovative Mikroelektronik (IHP), Frankfurt Oder, Germany — 2Semiconductor Materials, BTU Cottbus-Senftenberg, Cottbus, Germany
Polymethyl methacrylate (PMMA)-assisted wet transfer is widely used for integrating large-scale graphene grown on Ge(100)/Si substrates via chemical vapor deposition onto insulating SiO2/Si substrates[1,2]. However, the influence of PMMA molecular weight (MW) on properties of transferred graphene is insufficiently quantified. To address this, we investigate graphene transferred using low (50K), medium (600K), and high (950K) MW PMMA to isolate how polymer chain length governs film integrity and contamination. Characterization by atomic force microscopy (AFM), and spatially resolved X-ray photoelectron spectroscopy (XPS) reveals reduced contamination and smoother topography for graphene with 600K transfers. Additionally, micro-Raman spectroscopy demonstrates strain-free graphene with reduced doping and a 2D peak full width at half maximum (FWHM) of 35.53 cm-1 consistent with as-grown values. 1. Akhtar F., et al. ACS Appl. Mater. Interfaces 15 (2023). 2. Lukose R., et al. Scientific Reports 11 (2021). Acknowledgement: This research was funded by the European Union*s Horizon Europe research and innovation programme under grant agreement No 101120938 (GATEPOST).
Keywords: Graphene; Raman; Transfer; Polymethyl methacrylate (PMMA); 2D materials