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ABOUT/BIOGRAPHY

Polychronis Tsipas studied physics and obtained his M.Sc. in Microsystems and Nanodevices from the National Technical University of Athens (Greece) in 2005 and his Ph.D. from the National Technical University of Athens in collaboration with the Institute of Material Science of NCSR Demokritos (Greece) in 2009 on the growth and characterization of high-k dielectric thin films on Ge. From 2011 to 2012, he worked as a Post-Doctoral Researcher in the Institute of Microelectronics of NCSR Demokritos on plasma etching and characterization of Si, SiO2 and Si3N4 microstructures and nanostructures for microelectronic and optoelectronic applications. The period 2012-2017 he worked at the MBE laboratory of NCSR Demokritos under the SMARTGATE (Smart Gates for the Green Transistor) EU project on search for novel 2D materials like graphene, silicene, germanene, transition metal dichalcogenides and topological insulators for low-power electronic applications. The period 2017-2019, he worked under the Greek State Scholarships Foundation (IKY) program for the strenghtening of post-doctoral research titled as "Information storage in topological (3D Dirac and Weyl) semimetals for applications in non-volatile memories". In the period 2019-2023, he worked for the SKYTOP (Skyrmion-Topological insulator and Weyl semimetal technology) EU project on the search for novel 2D ferromagnets and topological materials (topological insulators and Weyl semimetals) for skyrmionic and spintronic applications. Since 2023, he works for the FIXIT (Scaled Ferroelectric X-bars for AI-driven sensors and actuators) EU project on the fabrication of low-power memories based on ferroelectrics for the realization of electronic artificial intelligence systems. He has (co)authored more than 60 scientific publications in international peer-reviewed journals and he has received >2400 citations for his work (h-index: 24).

Research Interests:

  • Germanium electronic devices (MOSFET, Schottky and p-n diodes)
  • High-k dielectrics for microelectronic devices
  • Ferroelectrics for embedded memories, analog synapses and steep slope switches.
  • 2D materials (transition metal dichalcogenides, graphene, silicene) and their heterostructures for electronic applications
  • Topological materials (topological insulators, Weyl semimetals) and 2D ferromagnets for spintronic and skyrmionic devices
  • Spin-charge conversion at topological material/ferromagnet heterostructures for terahertz (THz) emission applications

Selected publications:

  • P. Tsipas, E. Xenogiannopoulou, S. Kassavetis, D. Tsoutsou, E. Golias, C. Bazioti, G. P. Dimitrakopulos, Ph. Komninou, H. Liang, M. Caymax, A. Dimoulas, “Observation of surface Dirac cone in high quality ultrathin epitaxial Bi2Se3 topological insulator on AlN(0001)”, ACS Nano, 8(7), 6614-6619, 2014
  • P. Tsipas, S. A. Giamini, J. Marquez-Velasco, N. Kelaidis, D. Tsoutsou, K. E. Aretouli, E. Xenogiannopoulou, E. K. Evangelou, A. Dimoulas, “Negative quantum capacitance effects in metal-insulator-semiconductor devices with composite graphene-encapsulated gates”, Advanced Electronic Materials, 2, 1500297, 2016
  • P. Tsipas, D. Tsoutsou, S. Fragkos, R. Sant, C. Alvarez, H. Okuno, G. Renaud, R. Alcotte, T. Baron, A. Dimoulas, “Massless Dirac fermions in ZrTe2 semimetal grown on InAs(111) by van der Waals epitaxy”, ACS Nano, 12(2), 1696-1703, 2018
  • P. Tsipas, S. Fragkos, D. Tsoutsou, C. Alvarez, R. Sant, G. Renaud, H. Okuno, A. Dimoulas, “Direct observation at room temperature of the orthorhombic Weyl semimetal phase in thin epitaxial MoTe2”, Advanced Functional Materials,28,1802084,2018
  • E. Longo, M. Belli, M. Alia, M. Rimoldi, R. Cecchini, M. Longo, C. Wiemer, L. Locatelli, P. Tsipas, A. Dimoulas, G. Gubbiotti, M. Fanciulli, R. Mantovan, “Large spin-to-charge conversion at room temperature in extended epitaxial Sb2Te3 topological insulator chemically grown on silicon”, Advanced Functional Materials,32, 2109361, 2022
  • N. Figueiredo-Prestes, P. Tsipas, S. Krishnia, P. Pappas, J. Peiro, S. Fragkos, V. Zatko, A. Lintzeris, B. Dlubak, S. Chaitoglou, M. Heuken, N. Reyren, H. Jaffrѐs, P. Seneor, A. Dimoulas, J. M. George, “Large fieldlike Spin-Orbit Torque and magnetization manipulation in a fully epitaxial van der Waals two-dimensional-ferromagnet/Topological-insulator heterostructure grown by molecular beam epitaxy”, Physical Review Applied, 19, 014012, 2023
  • E. Georgopoulou-Kotsaki, P. Pappas, A. Lintzeris, P. Tsipas, S. Fragkos, A. Markou, C. Felser, E. Longo, M. Fanciulli, R. Mantovan, F. Mahfouzi, N. Kioussis, A. Dimoulas, “Significant enhancement of ferromagnetism above room temperature in epitaxial 2D van der Waals Ferromagnet Fe5-δGeTe2/Bi2Te3 heterostructures”, Nanoscale, 15, 2223, 2023

PUBLICATIONS

Fakharuddin, Azhar, Armadorou, Konstantina-Kalliopi, Zorba, Leandros P., Tountas, Marinos, Seewald, Tobias, Soultati, Anastasia, Tsipas, Polychronis, Schütz, Emilia R., Tzoganakis, Nikolaos, Panagiotakis, Stylianos, Yannakopoulou, Konstantina, Dimoulas, Athanasios, Psycharis, Vassilis, Kymakis, Emmanuel, Yusoff, Abd Rashid bin Mohd, Aidinis, Konstantinos, Schmidt-Mende, Lukas, Vougioukalakis, Georgios C., Nazeeruddin, Mohammad Khaja and Vasilopoulou, Maria, A Triethyleneglycol C60 Mono-adduct Derivative for Efficient Electron Transport in Inverted Perovskite Solar Cells† Chinese Journal of Chemistry, Volume 41, Pages: 431 – 442, 2023 [doi]

Tsakalos, Evangelos, Athanassas, Constantin, Tsipas, Polychronis, Triantaphyllou, Maria, Geraga, Maria, Papatheodorou, George, Filippaki, Eleni, Christodoulakis, John and Kazantzaki, Maria, Luminescence geochronology and paleoenvironmental implications of coastal deposits of southeast Cyprus Archaeological and Anthropological Sciences, Springer, Volume 10, Pages: 41–60, 2018 [doi]

Aretouli, K.E., Tsoutsou, D., Tsipas, P., Marquez-Velasco, J., Aminalragia Giamini, S., Kelaidis, N., Psycharis, V. and Dimoulas, A., Epitaxial 2D SnSe2/ 2D WSe2 van der Waals heterostructures ACS Applied Materials and Interfaces, Volume 8, Pages: 23222-23229, 2016 [doi]

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