L
Lothar Frey
Researcher at University of Erlangen-Nuremberg
Publications - 308
Citations - 6052
Lothar Frey is an academic researcher from University of Erlangen-Nuremberg. The author has contributed to research in topics: Ion implantation & Focused ion beam. The author has an hindex of 28, co-authored 308 publications receiving 5083 citations. Previous affiliations of Lothar Frey include Fraunhofer Society.
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Journal ArticleDOI
Ferroelectricity in Simple Binary ZrO2 and HfO2
Johannes Müller,T. S. Böscke,Uwe Schröder,Stefan Mueller,D. Bräuhaus,Ulrich Böttger,Lothar Frey,Thomas Mikolajick +7 more
TL;DR: A structural investigation revealed the orthorhombic phase to be of space group Pbc2(1), whose noncentrosymmetric nature is deemed responsible for the spontaneous polarization in this novel, nanoscale ferroelectrics.
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Ion Implantation and Annealing for an Efficient N-Doping of TiO2 Nanotubes
Andrei Ghicov,Jan M. Macak,Hiroaki Tsuchiya,Julia Kunze,Volker Haeublein,Lothar Frey,Patrik Schmuki +6 more
TL;DR: In this paper, self-organized anodic titania nanotube layers were doped with nitrogen successfully using ion implantation, resulting in a N-doped crystalline anatase nanotubite structure with strongly enhanced photocurrent response in both the UV and the visible range.
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Ferroelectricity in yttrium-doped hafnium oxide
Johannes Müller,Uwe Schröder,T. S. Böscke,I. Müller,Ulrich Böttger,L. Wilde,Jonas Sundqvist,Martin Lemberger,P. Kücher,Thomas Mikolajick,Lothar Frey +10 more
TL;DR: In this article, structural and electrical evidence for a ferroelectric phase in yttrium doped hafnium oxide thin films is presented, based on X-ray diffraction.
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Ferroelectric Zr0.5Hf0.5O2 thin films for nonvolatile memory applications
Johannes Müller,T. S. Böscke,D. Bräuhaus,Uwe Schröder,Ulrich Böttger,Jonas Sundqvist,P. Kücher,Thomas Mikolajick,Lothar Frey +8 more
TL;DR: In this article, the observation of ferroelectricity in capacitors based on hafnium-zirconium-oxide thin films of 7.5 to 9.5 nm thickness was reported.
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“Black” TiO2 Nanotubes Formed by High-Energy Proton Implantation Show Noble-Metal-co-Catalyst Free Photocatalytic H2-Evolution
Ning Liu,Volker Häublein,Xuemei Zhou,Umamaheswari Venkatesan,Martin Hartmann,Mirza Mačković,Tomohiko Nakajima,Erdmann Spiecker,Andres Osvet,Lothar Frey,Patrik Schmuki +10 more
TL;DR: High-energy proton ion-implantation is applied to modify TiO2 nanotubes selectively at their tops to induce specific defects and a characteristic modification of the electronic properties not only in nanot tubes but also on anatase single crystal (001) surfaces.