CMOS and beyond CMOS
Discover why imec is the premier R&D center for advanced logic & memory devices. anced logic & memory devices.
Connected health solutions
Explore the technologies that will power tomorrow’s wearable, implantable, ingestible and non-contact devices.
Life sciences
See how imec brings the power of chip technology to the world of healthcare.
Sensor solutions for IoT
Dive into innovative solutions for sensor networks, high speed networks and sensor technologies.
Artificial intelligence
Explore the possibilities and technologies of AI.
More expertises
Discover all our expertises.
Be the first to reap the benefits of imec’s research by joining one of our programs or starting an exclusive bilateral collaboration.
Build on our expertise for the design, prototyping and low-volume manufacturing of your innovative nanotech components and products.
Use one of imec’s mature technologies for groundbreaking applications across a multitude of industries such as healthcare, agriculture and Industry 4.0.
Venturing and startups
Kick-start your business. Launch or expand your tech company by drawing on the funds and knowhow of imec’s ecosystem of tailored venturing support.
/Job opportunities/Developing Tip-Enhanced Raman Spectroscopy for advanced nanoelectronics

Developing Tip-Enhanced Raman Spectroscopy for advanced nanoelectronics

PhD - Leuven | More than two weeks ago

Nanoscale phonons

Metrology and materials characterization are critical components in the development of advanced nanoelectronics structures for both CMOS and more exotic applications. Within the family of characterization techniques, Raman spectroscopy is of particular interest due to its non-destructive character and exceptionally fast time-to-result. The technique is uniquely sensitive to mechanical stress, chemical composition, doping and crystallographic structure. However, regardless of the concept, state-of-the-art semiconductor devices are defined on length scales that are far beyond the optical diffraction limit. This prevents the applicability of classical Raman spectroscopy for nanoelectronics applications, as it relies on the scattering of light at visible wavelengths and hence is limited to spatial resolutions of the order of 1 µm. Through plasmonic coupling with ultra-sharp Scanning Probe Microscopy (SPM) tips, the strengths of both techniques are combined in what is known as Tip-Enhanced Raman Spectroscopy (TERS), translating the versatility of Raman spectroscopy into the SPM nanoscale resolution. This opens the path toward answering key questions for materials’ research like how currents and strain behave at nanoscale dimensions and how these parameters affect device performance. The technique has the potential to reveal non-uniformities in the material on nanometer length scales and elucidate on how these defects correlate with the electrical properties of the eventual device.

Despite the availability of a best-in-class setup, TERS remains an expert technique requiring extensive insight in both the SPM and Raman component, which the student will have the opportunity to develop. The objective is to come to a deep understanding of the laser-tip interaction, which will enable us to extract critical material parameters like mechanical stress, composition and doping from this non-standard Raman scattering configuration. The combination of the localized nature of the TERS experiment and the complexity of the advanced structures to be investigated (2D materials, scaled devices,...) sets a great metrology challenge. The ultimate goal is to cross-correlate the Raman results with information from the other available SPM modes (KPFM, MFM, SCM,...). Building on extensive in-house know-how on both the spectroscopy and SPM aspects of the technique, the PhD candidate will develop and optimize TERS measurement approaches and explore their interpretation for deep-subwavelength semiconductor structures. The unique and stimulating imec research environment and the availability of flagship metrology equipment will enable breakthrough scientific results.

Required background: Physics, Engineering

Type of work: 70% experimental, 30% interpretation and modelling

Supervisor: Ingrid De Wolf

Co-supervisor: Claudia Fleischmann

Daily advisor: Thomas Nuytten

The reference code for this position is 2021-005. Mention this reference code on your application form.

This website uses cookies for analytics purposes only without any commercial intent. Find out more here. Our privacy statement can be found here. Some content (videos, iframes, forms,...) on this website will only appear when you have accepted the cookies.