Dr. Yasin Ekinci

Yasin Ekinci was the ad interim head of the former Laboratory for Micro and Nanotechnology (LMN) from July 2018 until December 2021. He also heads the Advanced Lithography and Metrology Group ad interim. He received his Bachelor's degree in Physics at Middle East Technical University, Ankara, Turkey, in 1997; his Master's degree in Engineering Sciences at the University of De Montfort, Leicester, UK, in 1999. He obtained his Ph.D. in Max-Planck Institute for Dynamics and Self-Organization, Göttingen, Germany, in Dec. 2003. In Nov. 2004, he joined PSI as a postdoctoral researcher. Between 2006 and 2012, he worked as a postdoctoral researcher and subsequently as a senior scientist and a lecturer in the Department of Materials at ETH Zürich. Since 2009, he works at PSI as a senior scientist, and in 2016 he was appointed as the head of the Advanced Lithography and Metrology group. The group operates the XIL-II beamline and focuses on patterning, imaging and metrology applications using EUV light, particularly, in collaboration with major semiconductor companies.

He worked on various topics of nanoscience and technology, including atom optics, surface science, EUV lithography, resist materials, coherent scattering, lensless imaging, plasmonics, biosensing, semiconductor nanostructures, and nanofluidics. He is author/co-author of more than 220 papers, 3 book chapters, and 8 patent applications. He received Young investigator of the year award of Swiss Society for Optics and Microscopy in 2009. He is a fellow of SPIE and member of Swiss Nanoscience Institute.

Strategic planning, scientific supervision, funding, personnel and financial management of the Laboratory for Micro and Nanotechnology (LMN). The organization unit is one of six laboratories of the Photon Science Division of the PSI and hosts 6 research groups. Management of the lab with a total number of 40-50 people and an annual budget of about 6 MCHF. Responsibility for the operation of cleanrooms and three beamlines at Swiss Light Source. Strategic lead of the lab for performing outstanding academic and industrial research in nanoscience by exploiting the synergies between advanced micro/nanofabrication and synchrotrons and free-electron lasers. Planning of large projects in instrumentation. Technology development in advanced micro/nanofabrication techniques and optical metrology methods and subsequent commercialization. Lead of the Advanced Lithography and Metrology Group. Supervision of Masters and Ph.D. students and postdocs. Operation and technology development at the XIL-II beamline. Member of various steering committees.

His current research mainly focuses on methods of nanolithography and metrology using photons with short wavelengths and, in particular, at the extreme ultraviolet (EUV) wavelength.

One of his major achievements has been the technological development and operation of the EUV interference lithography tool, which has the world-record resolution in photolithography down to 6 nm half-pitch. His research group has strong collaborations with industrial partners who are the major players in the semiconductor industry. His contributions include the early development of photoresist materials to be used in future technology nodes of semiconductor manufacturing.  At the same time, this novel technology offers new opportunities for academic research by providing nanostructures for various projects, thanks to its high resolution, high throughput, and large area capabilities.

In recent years, his research is also focused on the development of lensless imaging methods for applications in EUV photomask metrology. RESCAN project, which was initiated with industrial funding, involves the development of coherent diffraction algorithms and instrument development to provide solutions to the challenges of semiconductor manufacturing.

He also has research interests in various topics of nanoscience and technology, including semiconductor nanostructures, nanophotonics, nanofluidics, and nanocatalysis. For example, his group is developing nanofluidic devices for reliable, high-throughput and contact-free trapping, manipulation of nanoparticles for applications in soft condensed matter, biology, and medicine.

For an extensive overview, we kindly refer you to our publication repository DORA and for the research profile and the personal  publication lists on Google Scholar (https://scholar.google.com/citations?hl=en&user=aR3ZzTIAAAAJ), Publons (https://publons.com/researcher/2564808/yasin-ekinci/), and ORCID (https://orcid.org/0000-0002-0331-0501).

• Catalyst support effects on hydrogen spillover 
  W. Karim, C. Spreafico, A. Kleibert, J. Gobrecht, J. VandeVondele, Y. Ekinci, and J. A. van Bokhoven, Nature 541, 68 (2017) 

Hydrogen spillover is a phenomenon in which hydrogen reduces a nanoparticle through diffusion on a substrate. This effect contributes decisively to the efficiency of catalysis with hydrogen. It is very difficult to verify experimentally and, therefore, controversially discussed for 60 years. In this paper, in which YE and JAB are the corresponding authors of PSI, we designed a model system using advanced lithographic methods and studied the effect using single-particle spectromicroscopy.

• Photolithography reaches 6 nm half-pitch using extreme ultraviolet light 
  D. Fan and Y. Ekinci 
  J. Micro/Nanolith. MEMS MOEMS 15(3), 033505 (2016) 

EUV lithography is the leading-edge technology in semiconductor manufacturing at 7 nm technology node and below, where 7 nm node corresponds to dense features of about 20 nm half-pitch. With this paper, we set a new record resolution in photolithography and demonstrate that there are no fundamental limitations of photolithography down to this resolution.

• Deep-ultraviolet surface-enhanced resonance Raman scattering of adenine on aluminum nanoparticle arrays, 
  S. K. Jha, Z. Ahmed, M. Agio, Y. Ekinci, and J. F. Löffler,
  J. Am. Chem. Soc. 134, 1966 (2012). 

Surface-enhanced Raman spectroscopy (SERS) is a powerful tool for enhancing the inherently low Raman scattering of molecules. In this paper, where YE is the corresponding author, we used aluminum nanoparticles as plasmonic structure and deep UV excitation wavelength, which provides fluorescence-background free Raman spectra and increased Raman scattering due to reduced wavelength and resonance effects. We achieved real-time, reproducible, and label-free detection of adenine with zeptomole sensitivity.