Filtern
Erscheinungsjahr
Dokumenttyp
- Vortrag (68)
- Posterpräsentation (31)
- Beitrag zu einem Tagungsband (21)
- Zeitschriftenartikel (13)
- Buchkapitel (10)
- Beitrag zu einem Sammelband (4)
- Monografie (1)
- Corrigendum (1)
- Video (1)
Referierte Publikation
- nein (150) (entfernen)
Schlagworte
- Laser-induced periodic surface structures (LIPSS) (34)
- Surface functionalization (21)
- Femtosecond laser (17)
- Femtosecond laser ablation (14)
- Laser processing (12)
- Applications (9)
- Laser-induced periodic surface structures, LIPSS (9)
- Laser ablation (7)
- Microstructures (6)
- Nanostructures (6)
- Oxidation (6)
- Friction (5)
- Tribology (5)
- Wear (5)
- Ablation (4)
- Electromagnetic scattering (4)
- Capillary waves (3)
- Femtosecond laser processing (3)
- Laser-induced X-ray emission (3)
- Oberflächenfunktionalisierung (3)
- Ultrafast laser processing (3)
- Wetting (3)
- Atomic force microscopy (2)
- Chalcopyrite (2)
- Cu(InGa)Se2 (2)
- Damage threshold (2)
- Dielectrics (2)
- Doping (2)
- Femtosecond (2)
- Free electron laser (2)
- Hard X-ray photoelectron spectroscopy (HAXPES) (2)
- Incubation (2)
- Indium phosphide (2)
- Industrial applications (2)
- LIPSS (2)
- Laser-Materialbearbeitung (2)
- Laser-induced periodic surface structures (2)
- Light concentration (2)
- Micro solar cells (2)
- Nanosecond laser ablation (2)
- Nanostrukturen (2)
- Radiation protection (2)
- Selective emitter (2)
- Silicon (2)
- Steel (2)
- Ti6Al4V alloy (2)
- Time-resolved scattering (2)
- Titanium alloy (2)
- 100Cr6 (1)
- 532 nm wavelength (1)
- Absorber optimization (1)
- Additive (1)
- Additives (1)
- Anodization (1)
- Antiadhesive surfaces (1)
- Antibakterielle Oberflächen (1)
- Antimicrobial (1)
- Auger electron spectroscopy (1)
- Bacteria (1)
- Bacteria-repellent surfaces (1)
- Bacterial adhesion tests (1)
- Bessel-Strahlen (1)
- Biofilm growth (1)
- Biofilme (1)
- Biofilms (1)
- Bone screws (1)
- CIGS (1)
- Carrier excitation (1)
- Carrier plasmas (1)
- Cell adhesion (1)
- Cell-repellent surfaces (1)
- Chalkopyrite (1)
- Chemical analyses (1)
- Chemical analysis (1)
- Copper indium gallium diselenide (CIGSe) (1)
- Cribellate spiders (1)
- CuInSe2 (1)
- Double-pulse (1)
- Dünnschichtsolarzellen (1)
- Electrical properties (1)
- Electrochemical treatment (1)
- Electromagnetic radiation (1)
- Femtosecond laser irradiation (1)
- Femtosecond laser-processing (1)
- Femtosecond pulse laser (1)
- Femtosekunden-Laserablation (1)
- Femtosekundenlaser (1)
- Finite-difference time-domain calculations (1)
- Fluid transport (1)
- Force distance curve (1)
- Free electron laser (FEL) (1)
- Glasses (1)
- Glow-discharge optical emission spectroscopy (1)
- Hydrodynamics (1)
- Implant material (1)
- Interferometer (1)
- Ionic liquid (1)
- Isotopes (1)
- LIFT (1)
- Laser induced periodic surface structures (LIPSS) (1)
- Laser material processing (1)
- Laser materials processing (1)
- Laser nanostructuring (1)
- Laser scribing (1)
- Laser technology (1)
- Laser-induced Periodic Surface Structures (LIPSS) (1)
- Laser-induced amorphization (1)
- Laser-induced forward transfer (LIFT) (1)
- Laser-induced micro- and nanostructures (1)
- Laser-induced periodic surface strcutures (LIPSS) (1)
- Laser-induced periodic surface strcutures, LIPSS (1)
- Laser-induzierte periodische Oberflächen-Nanostrukturen (1)
- Laser-induzierte periodische Oberflächenstrukturen (1)
- Laserschutz (1)
- Laserstrukturierung (1)
- Lizard (1)
- Lizards (1)
- Lubrication (1)
- Materialbearbeitung (1)
- Matter reorganization (1)
- Medical implants (1)
- Metals (1)
- Micro solar cell (1)
- Micromachining (1)
- Microstructure (1)
- Mikrostrukturen (1)
- Modelling (1)
- Molybdenum (1)
- Multicrystalline silicon (1)
- Multiphoton absorption (1)
- Nanometrology (1)
- Nanosecond pulses (1)
- Nanostrcutures (1)
- Native oxide layer (1)
- Nonlinear lithography (1)
- Oberflächenmodifikation (1)
- Optical properties (1)
- Optical scattering (1)
- Optics at surfaces (1)
- PAG (1)
- Pacemaker (1)
- Photovoltaik (1)
- Polymer (1)
- Pulse shaping (1)
- Pump-probe (1)
- Pump-probe experiments (1)
- Quantitative phase-contrast microscopy (1)
- Quarzglas (1)
- Reactive oxygen species (1)
- Refractive index engineering (1)
- Reibung (1)
- Reibungsreduktion (1)
- Ripples (1)
- Röntgenemission (1)
- Saphir (1)
- Scanning electron microscopy (1)
- Scanning/atomic force microscopy (SFM/AFM) (1)
- Second harmonic generation (SHG) (1)
- Secondary hazard (1)
- Sekundärstrahlung (1)
- Self-organization (1)
- Semiconductor (1)
- Semiconductors (1)
- Silicon solar cell (1)
- Simulation (1)
- Spatial light interference microscopy (1)
- Spectroscopic imaging ellipsometry (1)
- Sputter deposition (1)
- Stiffness (1)
- Strain (1)
- Surface engineering (1)
- Surface plasmon polaritons (1)
- Surface structures (1)
- TeO2 (1)
- Tellurium dioxide crystals (1)
- Theoretical modelling (1)
- Thin-film solar cells (1)
- TiAl64V (1)
- Time-of-flight mass spectrometry (TOF-MS) (1)
- Time-of-flight mass spectroscopy (1)
- Time-of-flight secondary ion mass spectrometry (ToF-SIMS) (1)
- Time-offlight secondary ion mass spectrometry (ToF-SIMS) (1)
- Time-resolved analysis (1)
- Time-resolved coherent XUV scattering (1)
- Time-resolved coherent scattering (1)
- Titanium (1)
- Titanium alloys (1)
- Titanium nitride (1)
- ToF-SIMS (1)
- Transmission electron microscopy (1)
- Tribologie (1)
- Ultra-short pulse laser processing (1)
- Ultrafast laser excitation (1)
- Ultrafast phenomena (1)
- Ultrafast scattering (1)
- Ultrakurze Laserpulse (1)
- Ultrakurzpuls-Laser (1)
- Ultrakurzpuls-Laserbearbeitung (1)
- Ultrashort (1)
- Ultrashort laser material interaction (1)
- Ultrashort laser processing (1)
- Ultrashort pulse laser processing (1)
- VUV nanosecond laser ablation (1)
- Verschleiß (1)
- Verschleißreduktion (1)
- X-ray (1)
- XUV scattering (1)
- a-Si/my-Si (1)
Organisationseinheit der BAM
- 6 Materialchemie (58)
- 6.2 Material- und Oberflächentechnologien (58)
- 9 Komponentensicherheit (11)
- 9.5 Tribologie und Verschleißschutz (11)
- 6.1 Oberflächen- und Dünnschichtanalyse (7)
- 4 Material und Umwelt (5)
- 4.1 Biologische Materialschädigung und Referenzorganismen (5)
- 6.6 Physik und chemische Analytik der Polymere (1)
A promising technology in photovoltaics is based on micro-concentrator solar cells, where the photovoltaic active area is realized as an array of sub-millimeter sized cells onto which the incident light is focused via microlenses. This approach allows to increase the cell efficiency and to realize much more compact modules compared to macroscopic concentrator devices. At the same time, expensive raw materials can be saved, which is of interest, for example, with respect to indium in the case of copper-indium-gallium-diselenide (CIGSe) thin film solar cells. Two methods to produce micro-sized precursors of CIGSe absorbers on molybdenum are presented using 30-fs laser pulses at 790 nm wavelength. On the one hand, a multi pulse surface structuring of the molybdenum film or the underlying glass substrate and a subsequent physical vapor deposition were used for a site-selective aggregation of indium droplets. On the other hand, a single pulse laser-induced forward transfer was utilized to selectively deposit combined copper-indium precursor pixels on the molybdenum back contact of the solar cell. Post-processing (selenization, isolation, contacting) of the laser-generated micro-sized precursors results in functional CIGSe solar cells.
Femtosecond laser-induced periodic surface structures: from light localization to applications
(2019)
This presentation reviews the current state in the field of Laser-induced Periodic Surface Structures (LIPSS). These surface nanostructures are a universal phenomenon and can be generated on almost any material by irradiation with intense linearly polarized laser radiation. LIPSS are formed in a “self-ordered” way and are often accompanying material processing applications. They can be produced following a single-step process and enable surface functionalization through the adaption of optical, mechanical and chemical surface properties. Their structural sizes typically range from several micrometers down to less than 100 nanometers exhibiting a clear correlation with the polarization direction of the laser radiation. Various types of surface structures are classified, relevant control parameters are identified, and their material specific formation mechanisms are analyzed for different types of inorganic solids, i.e., metals, semiconductors, and dielectrics, through time-resolved optical experiments and theoretical simulations. Finally, technological applications featuring surface functionalization in the fields of optics, fluidics, medicine, and tribology are discussed.
Femtosecond laser-induced periodic surface structures: importance of transient excitation stages
(2011)
The formation of laser-induced periodic surface structures (LIPSS) upon irradiation of semiconductors and dielectrics by linearly polarized high-intensity Ti:sapphire fs-laser pulses (τ ~100 fs, λ ~800 nm) is studied experimentally and theoretically. In the experiments, two different types of LIPSS exhibiting very different spatial periods are observed (socalled LSFL low spatial frequency LIPSS, and HSFL - high spatial frequency LIPSS), both having a different dependence on the incident laser fluence and pulse number per spot. The experimental results are analyzed by means of a new theoretical approach, which combines the generally accepted LIPSS theory of J. E. Sipe and co-workers [Phys. Rev. B 27, 1141-1154 (1983)] with a Drude model, in order to account for transient changes of the optical properties of the irradiated materials. The joint Sipe-Drude model is capable of explaining numerous aspects of fs-LIPSS formation, i.e., the orientation of the LIPSS, their fluence dependence as well as their spatial periods. The latter aspect is specifically demonstrated for silicon crystals, which show experimental LSFL periods Λ somewhat smaller than λ. This behaviour is caused by the excitation of surface plasmon polaritons, SPP, (once the initially semiconducting material turns to a metallic state upon formation of a dense free-electron-plasma in the material) and the subsequent interference between its electrical fields with that of the incident laser beam, resulting in a spatially modulated energy deposition at the surface.
Upon multi-pulse irradiation, a feedback mechanism, caused by the redshift of the resonance in a grating-assisted SPP excitation, is further reducing the LSFL spatial periods. The SPP-based mechanism of LSFL successfully explains the remarkably large range of LSFL periods between ~0.6 λ and λ.