High-Resolution Raman-Atomic-Force-Microscopy

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Raman spectroscopy is based on inelastic scattering of light within solids. It is a power technique to investigate the chemical composition, mechanical stress as well as crystallinity and crystal-orientation of thin-films. In this proposal we apply for funding for a combined high-resolution Raman- and Atomic-Force-Microscope. Research of the group of Prof. Tappertzhofen (Chair for Micro- and Nanoelectronics, TU Dortmund University) is focused on fabrication and modification of semiconductor, multifunctional and novel low-dimensional materials. These materials are the building blocks for new micro- and nanoelectronic devices for application in information technology, sensor systems, photonics and micro- and nanosystems. The combined high-resolution Raman- and Atomic-Force-Microscope will be an integral part of the group’s research infrastructure. The proposed measurement system will combine the high sensitivity (stoichiometry, crystallinity and interface stress) of two-dimensional Raman spectroscopy with the ultra-high lateral resolution of Atomic-Force-Microscopy. With its powerful analytic capabilities, the microscope system will enable to carry out challenging and original research-projects targeting fundamental and application-oriented aspects. In particular, we will use this high-resolution technique to investigate the chemical composition and crystallinity of memristively switching transition-metal-oxides for neuromorphic applications. In another project, the measurement system will be used to analyze defects and the morphology of low-dimensional materials at the same lateral position. Based on these findings novel tunnel field effect transistors will be fabricated and investigated. In combination with a dedicated sample chamber for adjusting variable temperatures and atmospheres physico-chemical phenomena of multifunctional materials will be investigated in situ. Special attention will be paid to the interplay of nanoionic redox-reactions in thin-films with the ambient gas. These materials have a high application potential for advanced nano-structured sensor technology. The measurement system will be operated by users based in the electrical engineering and information technology, chemistry, and bio-chemical engineering departments. It will thus take a key role in original research projects across departments and will enable future interdisciplinary synergies.