@phdthesis{Jia, author = {Jia, Guobin}, title = {Characterization of electrical and optical properties of silicon based materials}, pages = {II, 153}, language = {en} } @phdthesis{Wiatrek, author = {Wiatrek, Andrzej}, title = {Untersuchung der Eigenschaften der ges{\"a}ttigten stimulierten Brillouin-Streuung und ihrer Anwendeungsm{\"o}glichkeiten}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus-29577}, pages = {XIII, 111 Bl.}, language = {de} } @phdthesis{Hartmann, author = {Hartmann, Carsten}, title = {Aluminiumnitrid-Volumenkristallz{\"u}chtung mittels physikalischen Gasphasentransports}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus-28992}, pages = {XV, 138}, language = {de} } @misc{GregorcicSedlacekPodgorniketal., author = {Gregorcic, Peter and Sedlacek, Marko and Podgornik, Bojan and Reif, J{\"u}rgen}, title = {Formation of laser-induced periodic surface structures (LIPPS) on tool steel by multiple picosecond laser pulses of different polarizations}, series = {Applied Surface Science}, volume = {387}, journal = {Applied Surface Science}, issn = {0169-4332}, pages = {698 -- 706}, language = {en} } @misc{ReifVarlamovaUhligetal., author = {Reif, J{\"u}rgen and Varlamova, Olga and Uhlig, Sebastian and Varlamov, Sergej and Bestehorn, Michael}, title = {On the physics of self-organized nanostructure formation upon femtosecond laser ablation}, series = {Applied Physics A}, volume = {117}, journal = {Applied Physics A}, number = {1}, issn = {0947-8396}, doi = {10.1007/s00339-014-8339-x}, pages = {179 -- 184}, abstract = {We present new results on femtosecond LIPSS on silicon, fostering the dynamic model of self-organized structure formation. The first set of experiments demonstrates LIPSS formation by irradiation with a femtosecond white light continuum. The ripples are, as usual, perpendicular to the light polarization with a fluence-dependent wavelength between 500 and 700 nm. At higher dose (fluence × number of shots), the LIPSS turn to much coarser structures. The second set of experiments displays the dose dependence of pattern evolution at about threshold fluence. In contrast to the general case of multi-pulse LIPSS, where a strong dependence of the structures on the laser polarization is observed, single-shot exposition of silicon at about the ablation threshold results in a concentric pattern of very regular sub-wavelength ripples following the oval shape of the irradiated spot, without any reference to the laser polarization. When increasing the number of pulses, the usual, typical ripples develop and then coalesce into broader perpendicular structures, interlaced with remnants of the first, finer ripples.}, language = {en} } @misc{ObrosovGulyaevZaketal., author = {Obrosov, Aleksei and Gulyaev, Roman and Zak, Andrzej and Ratzke, Markus and Naveed, Muhammad and Dudzinski, Wlodzimierz and Weiß, Sabine}, title = {Chemical and Morphological Characterization of Magnetron Sputtered at Different Bias Voltages Cr-Al-C Coatings}, series = {Materials}, volume = {10}, journal = {Materials}, number = {2}, issn = {1996-1944}, doi = {10.3390/ma10020156}, pages = {156}, abstract = {MAX phases (M = transition metal, A = A-group element, and X = C/N) are of special interest because they possess a unique combination of the advantages of both metals and ceramics. Most attention is attracted to the ternary carbide Cr2AlC because of its excellent high-temperature oxidation, as well as hot corrosion resistance. Despite lots of publications, up to now the influence of bias voltage on the chemical bonding structure, surface morphology, and mechanical properties of the film is still not well understood. In the current study, Cr-Al-C films were deposited on silicon wafers (100) and Inconel 718 super alloy by dc magnetron sputtering with different substrate bias voltages and investigated using Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD), Atomic Force Microscopy (AFM), and nanoindentation. Transmission Electron Microscopy (TEM) was used to analyze the correlation between the growth of the films and the coating microstructure. The XPS results confirm the presence of Cr2AlC MAX phase due to a negative shift of 0.6-0.9 eV of the Al2p to pure aluminum carbide peak. The XRD results reveal the presence of Cr2AlC MAX Phase and carbide phases, as well as intermetallic AlCr2. The film thickness decreases from 8.95 to 6.98 µm with increasing bias voltage. The coatings deposited at 90 V exhibit the lowest roughness (33 nm) and granular size (76 nm) combined with the highest hardness (15.9 GPa). The ratio of Al carbide to carbide-like carbon state changes from 0.12 to 0.22 and correlates with the mechanical properties of the coatings. TEM confirms the columnar structure, with a nanocrystalline substructure, of the films.}, language = {en} } @misc{ObrosovGulyaevRatzkeetal., author = {Obrosov, Aleksei and Gulyaev, Roman and Ratzke, Markus and Volinsky, Alex A. and Bolz, Sebastian and Naveed, Muhammad and Weiß, Sabine}, title = {XPS and AFM Investigations of Ti-Al-N Coatings Fabricated Using DC Magnetron Sputtering at Various Nitrogen Flow Rates and Deposition Temperatures}, series = {Metals}, volume = {7}, journal = {Metals}, number = {2}, issn = {2075-4701}, doi = {10.3390/met7020052}, pages = {52}, abstract = {Ti-Al-N coatings were deposited by direct current magnetron sputtering (DCMS) onto IN 718 at different nitrogen flow rates and deposition temperatures. The coatings' properties were characterized using atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) as well as nanoindentation. It was found that higher deposition temperature leads to higher surface roughness and nitrogen flux influences the shape of grains. According to XPS, the bonding structure of all coatings exhibited the (Ti,Al)N phase. Mechanical properties depend on the Al content within the films. The coating with the best mechanical properties (deposited at 500 °C and 20 standard cubic centimeters per minute (sccm)) was further deposited onto tungsten carbide (WC) cutting tools for cylindrical turning experiments. A quasi-constant flank wear was observed until a machining volume of 23,500 mm³.}, language = {en} } @misc{BorciaBorciaBestehornetal., author = {Borcia, Rodica and Borcia, Ion-Dan and Bestehorn, Michael and Varlamova, Olga and Hoefner, Kevin and Reif, J{\"u}rgen}, title = {Drop Behavior Influenced by the Correlation Length on Noisy Surfaces}, series = {Langmuir}, volume = {35}, journal = {Langmuir}, doi = {10.1021/acs.langmuir.8b03878}, pages = {928 -- 934}, language = {en} } @incollection{Reif, author = {Reif, J{\"u}rgen}, title = {Surface Functionalization by Laser-Induced Structuring}, series = {Advances in the Application of Lasers in Materials Science}, booktitle = {Advances in the Application of Lasers in Materials Science}, editor = {Ossi, Paolo M.}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-96844-5}, doi = {10.1007/978-3-319-96845-2_3}, pages = {63 -- 88}, language = {en} } @misc{VarlamovaHoefnerRatzkeetal., author = {Varlamova, Olga and Hoefner, Kevin and Ratzke, Markus and Reif, J{\"u}rgen and Sarker, Debasish}, title = {Modification of surface properties of solids by femtosecond LIPSS writing: comparative studies on silicon and stainless steel}, series = {Applied Physics A}, volume = {123}, journal = {Applied Physics A}, number = {12}, issn = {0947-8396}, doi = {10.1007/s00339-017-1362-y}, pages = {6}, language = {en} } @misc{CzajkowskiRatzkeVarlamovaetal., author = {Czajkowski, Klaus and Ratzke, Markus and Varlamova, Olga and Reif, J{\"u}rgen}, title = {Femtosecond-laser-induced periodic surface structures on magnetic layer targets: The roles of femtosecond-laser interaction and of magnetization}, series = {Applied Surface Science}, volume = {417}, journal = {Applied Surface Science}, issn = {0169-4332}, doi = {10.1016/j.apsusc.2017.03.148}, pages = {84 -- 87}, language = {en} } @misc{VarlamovaReifStolzetal., author = {Varlamova, Olga and Reif, J{\"u}rgen and Stolz, Michael and Borcia, Rodica and Borcia, Ion-Dan and Bestehorn, Michael}, title = {Wetting properties of LIPSS structured silicon surfaces}, series = {The European Physical Journal B}, volume = {92}, journal = {The European Physical Journal B}, number = {5}, issn = {1434-6036}, doi = {10.1140/epjb/e2019-90672-2}, pages = {8}, abstract = {The controlled dynamics of liquid drops via generation of specific wetting states on a solid surface is of great interests both in the fundamental and applied sciences. Considering that the wettability is strongly dependent on the surface topography and surface roughness, we investigate - through experiments and theory - the effect of laser-induced periodic surface structures (LIPSS) generated on silicon (100) targets as a control parameter of wetting properties. To obtain structured silicon surfaces with different morphological features, we patterned the surface by irradiation with femtosecond pulses from an amplified Ti:Sapphire laser system (790 nm/100 fs/1 kHz) at a fluence in the range of 0.4-1.2 J/cm2 on a spot with a diameter about of 100 μm. Variation of the applied irradiation dose results in surface modifications with the roughness about of a few tens of nanometers are ranging from regular LIPSS patterns with the lateral period of about 500-700 nm to complex agglomerations of 3-D microstructures with several-μm feature size. The theoretical study on the correlation of wetting properties with the surface topography has been performed within a phase field model. We found an excellent agreement of numerical results with experiments.}, language = {en} } @misc{SchlipfMartinStchakovskyetal., author = {Schlipf, Jon and Martin, Elena and Stchakovsky, Michel and Benedetti, Alessandro and Fischer, Inga Anita and Schulze, J{\"o}rg and Chiussi, Stefano}, title = {Ellipsometric analysis of concentration gradients induced in semiconductor crystals by pulsed laser induced epitaxy}, series = {Journal of Vacuum Science \& Technology B}, volume = {37}, journal = {Journal of Vacuum Science \& Technology B}, number = {6}, issn = {2166-2754}, doi = {10.1116/1.5122777}, language = {en} } @misc{FunkKernWeisshauptetal., author = {Funk, Hannes S. and Kern, Michael and Weisshaupt, David and S{\"u}rgers, Christoph and Fischer, Inga Anita and Oehme, Michael and Slageren, Joris van and Schulze, J{\"o}rg}, title = {Magnetic Characterization of a Mn Based Ferromagnet on SixGe(1-x-y)Sny with High Sn Content}, series = {ECS Transactions}, volume = {93}, journal = {ECS Transactions}, number = {1}, issn = {1938-5862}, doi = {10.1149/09301.0101ecst}, pages = {101 -- 104}, language = {en} } @misc{FischerAugelBerkmannetal., author = {Fischer, Inga Anita and Augel, Lion and Berkmann, Fritz and Kawaguchi, Yuma and Schlipf, Jon and Schulze, J{\"o}rg}, title = {Plasmonics-Integrated Ge PIN-Photodetectors}, series = {ECS Transactions}, volume = {93}, journal = {ECS Transactions}, number = {1}, issn = {1938-5862}, doi = {10.1149/09301.0041ecst}, pages = {41 -- 44}, language = {en} } @misc{FischerClausenSchwarzetal., author = {Fischer, Inga Anita and Clausen, Caterina J. and Schwarz, Daniel and Zaumseil, Peter and Capellini, Giovanni and Virgilio, Michele and Da Silva Figueira, Maria Cecilia and Birner, Stefan and Koelling, Sebastian and Koenraad, Paul M. and Huang, Michael R. S. and Koch, Christoph T. and Wendav, Torsten and Busch, Kurt and Schulze, J{\"o}rg}, title = {Composition analysis and transition energies of ultrathin Sn-rich GeSn quantum wells}, series = {Physical Review Materials}, volume = {4}, journal = {Physical Review Materials}, number = {2}, issn = {2475-9953}, doi = {10.1103/PhysRevMaterials.4.024601}, pages = {10}, language = {en} } @misc{SchlykowManganelliRoemeretal., author = {Schlykow, Viktoria and Manganelli, Constanza Lucia and R{\"o}mer, Friedhard and Clausen, Caterina J. and Augel, Lion and Schulze, J{\"o}rg and Katzer, Jens and Schubert, Michael Andreas and Witzigmann, Bernd and Schroeder, Thomas and Capellini, Giovanni and Fischer, Inga Anita}, title = {Ge(Sn) nano-island/Si heterostructure photodetectors with plasmonic antennas}, series = {Nanotechnology}, volume = {31}, journal = {Nanotechnology}, number = {34}, issn = {1361-6528}, doi = {10.1088/1361-6528/ab91ef}, pages = {11}, language = {en} } @misc{AugelFischerGollhoferetal., author = {Augel, Lion and Fischer, Inga Anita and Gollhofer, Martin and Oehme, Michael and Schulze, J{\"o}rg}, title = {Comparing Fourier transform infrared spectroscopy results with photocurrent measurements for Ge-on-Si PIN photodetectors with and without Al nanoantennas}, series = {Journal of Applied Physics}, volume = {128}, journal = {Journal of Applied Physics}, number = {1}, issn = {1089-7550}, doi = {10.1063/5.0012279}, pages = {013105-1 -- 013105-8}, language = {en} } @misc{WeisshauptFunkKernetal., author = {Weißhaupt, David and Funk, Hannes S. and Kern, Michal and Dettling, Marco M. and Schwarz, Daniel and Oehme, Michael and S{\"u}rgers, Christoph and Slageren, Joris van and Fischer, Inga Anita and Schulze, J{\"o}rg}, title = {Weak localization and weak antilocalization in doped Ge1-ySny layers with up to 8\% Sn}, series = {Journal of Physics: Condensed Matter}, volume = {33}, journal = {Journal of Physics: Condensed Matter}, number = {8}, issn = {1361-648X}, doi = {10.1088/1361-648X/abcb68}, pages = {8}, language = {en} } @misc{SchlipfTetznerSpiritoetal., author = {Schlipf, Jon and Tetzner, Henriette and Spirito, Davide and Manganelli, Constanza Lucia and Capellini, Giovanni and Huang, Michael R. S. and Koch, Christoph T. and Clausen, Caterina J. and Elsayed, Ahmed and Schulze, J{\"o}rg and Fischer, Inga Anita}, title = {Raman shifts in MBE-grown SixGe1 - x - ySny alloys with large Si content}, series = {Journal of Raman Spectroscopy}, journal = {Journal of Raman Spectroscopy}, issn = {1097-4555}, doi = {10.1002/jrs.6098}, pages = {9}, language = {en} } @misc{AugelSchlipfBullertetal., author = {Augel, Lion and Schlipf, Jon and Bullert, Sergej and B{\"u}rzele, Sebastian and Schulze, J{\"o}rg and Fischer, Inga Anita}, title = {Photonic-plasmonic mode coupling in nanopillar Ge-on-Si PIN photodiodes}, series = {Scientific Reports}, journal = {Scientific Reports}, number = {11}, issn = {2045-2322}, doi = {10.1038/s41598-021-85012-z}, pages = {9}, abstract = {Incorporating group IV photonic nanostructures within active top-illuminated photonic devices often requires light-transmissive contact schemes. In this context, plasmonic nanoapertures in metallic films can not only be realized using CMOS compatible metals and processes, they can also serve to influence the wavelength-dependent device responsivities. Here, we investigate crescent-shaped nanoapertures in close proximity to Ge-on-Si PIN nanopillar photodetectors both in simulation and experiment. In our geometries, the absorption within the devices is mainly shaped by the absorption characteristics of the vertical semiconductor nanopillar structures (leaky waveguide modes). The plasmonic resonances can be used to influence how incident light couples into the leaky modes within the nanopillars. Our results can serve as a starting point to selectively tune our device geometries for applications in spectroscopy or refractive index sensing.}, language = {en} } @misc{SchlipfFischer, author = {Schlipf, Jon and Fischer, Inga Anita}, title = {Rigorous coupled-wave analysis of a multi-layered plasmonic integrated refractive index sensor}, series = {Optics Express}, volume = {Vol. 29}, journal = {Optics Express}, number = {22}, issn = {1094-4087}, doi = {10.1364/OE.438585}, pages = {36201 -- 36210}, language = {en} } @misc{TetznerFischerSkibitzkietal., author = {Tetzner, Henriette and Fischer, Inga Anita and Skibitzki, Oliver and Mirza, M. M. and Manganelli, Constanza Lucia and Luongo, G. and Spirito, Davide and Douglas, J. P. and De Seta, Monica and Capellini, Giovanni}, title = {Current leakage mechanisms related to threading dislocations in Ge-rich SiGe heterostructures grown on Si(001)}, series = {Applied Physics Letters}, volume = {119}, journal = {Applied Physics Letters}, number = {15}, issn = {1077-3118}, doi = {10.1063/5.0064477}, language = {en} }