A5103274014- Silicon and Solar Cell Technologies
- Thin-Film Transistor Technologies
- Nanowire Synthesis and Applications
- Silicon Nanostructures and Photoluminescence
- Corrosion Behavior and Inhibition
- Hydrogen embrittlement and corrosion behaviors in metals
- Semiconductor materials and devices
- Electrodeposition and Electroless Coatings
- Magnesium Alloys: Properties and Applications
- Additive Manufacturing Materials and Processes
- High Entropy Alloys Studies
- Ion-surface interactions and analysis
- Microstructure and Mechanical Properties of Steels
- Photorefractive and Nonlinear Optics
- Titanium Alloys Microstructure and Properties
- Additive Manufacturing and 3D Printing Technologies
- Advanced Battery Technologies Research
- Metal Alloys Wear and Properties
- Integrated Circuits and Semiconductor Failure Analysis
- Optical Coatings and Gratings
- Advanced materials and composites
TU Bergakademie Freiberg
2023-2024
Leibniz Institute for Solid State and Materials Research
2021-2024
Martin Luther University Halle-Wittenberg
2012-2015
Universidad Autónoma de Madrid
2009
This article presents an overview of the fabrication methods black silicon, their resulting morphologies, and a quantitative comparison optoelectronic properties. To perform this comparison, different groups working on silicon solar cells have cooperated for study. The optical absorption minority carrier lifetime are used as benchmark parameters. differences in processes plasma etching, chemical or laser processing discussed compared with numerical models. Guidelines to optimize relevant...
We investigate the optical and opto-electronic properties of black silicon (b-Si) nanostructures passivated with Al2O3. The b-Si significantly improve absorption due to superior anti-reflection light trapping properties. By coating a conformal layer Al2O3 by atomic deposition, surface recombination velocity can be effectively reduced. show that control plasma-induced subsurface damage is equally important achieve low interface recombination. Surface velocities Seff<13 cm/s have been...
Aluminum oxide (Al2O3) layers, prepared by atomic layer deposition (ALD), provide excellent surface passivation properties on crystalline Si surfaces, which are of major importance for photovoltaic applications. Beyond the chemical reduction electronic state density, a supportive field effect mechanism emerges at Al2O3/Si interface. The origin fixed negative charges that responsible is currently under discussion. In this contribution, thin layers Al2O3 with thicknesses ranging from...
Implant-related infections or inflammation are one of the main reasons for implant failure. Therefore, different concepts prevention needed, which strongly promote development and validation improved material designs. Besides modifying surface by, example, antibacterial coatings (also implying drugs) deterring eliminating harmful bacteria, it is a highly promising strategy to prevent such by substrate materials. In this work, inherent behavior as-cast biodegradable Fe69Mn30C1 (FeMnC) alloy...
Biodegradable medical implants promise to benefit patients by eliminating risks and discomfort associated with permanent implantation or surgical removal. The time until full resorption is largely determined the implant's material composition, geometric design, surface properties. Implants a fixed residence time, however, cannot account for needs of individual patients, thereby imposing limits on personalization. Here, an active Fe-based implant system reported whose biodegradation...
In the last decade, additive manufacturing technologies like laser powder bed fusion (LPBF) have emerged strongly. However, process characteristics involving layer-wise build-up of part and occurring high, directional thermal gradient result in significant changes microstructure related properties compared to traditionally fabricated materials. This study presents influence build direction (BD) on resulting a novel austenitic Fe-30Mn-1C-0.02S alloy processed via LPBF. The samples display...
Laser powder bed fusion (LPBF) faces challenges when fabricating intricate structures with thin elements, comparable to the laser beam size, and thus requires precise deposition of melt spots. We devised a method for creating Fe-15Mn-0.8C filigree structure via LPBF pulsed Gaussian beam. Initially, single spots were deposited determine optimal exposure time depending on power spot size. Arrays tracks then deposited, varying power, point distance between spots, depth width each pool...
Fully degradable stents that temporarily support healing tissue can solve potential long-term complications associated with permanent implants. In this study, we investigate austenitic high-manganese high-carbon steels as promising candidates for such biodegradable stent applications. The microstructural characteristics and mechanical properties of the Fe–Mn–C were systematically analysed to assess their suitability purpose. A series four varying manganese (15 30 wt%) carbon (0.6–1.0 content...
The challenge of future solar cell technologies is the combination highly efficient concepts and low cost fabrication processes. A promising concept for high efficiencies usage nanostructured silicon, so-called black silicon. Due to its unique surface geometry optical path incoming light through silicon substrate enhanced nearly perfect trapping. Combined with semiconductor-insulator-semiconductor (SIS) it possible fabricate a device by using conventional sputtering technologies. Therefore,...
An overview and comparison of different fabrication methods black silicon is presented. Guidelines to optimize relevant parameters such as spatial frequencies surface defect densities for optoelectronic applications photovoltaics will be given.
Optical properties of black silicon (b-Si) can be tailored to minimize reflection losses less than 0.6 % between 300-1000 nm and improve the absorption at band-edge by light-trapping. Recently, metal assisted wet-chemically etched (MACE) b-Si was exploited fabricate high efficiency (18.2 %) solar cells with surface passivation thermal SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> recombination velocities (SRV) ~100 cm/s [1]. We...
Optically black silicon nanostructures show excellent light trapping properties. Towards the integration of these structures into a solar cell device, passivation performance atomic layer deposited thin Al2O3 films is investigated.