Institut für Hochfrequenz- und Halbleiter-Systemtechnologien

124 Items

Recent Submissions
On-chip automation of cell-free protein synthesis: new opportunities due to a novel reaction mode

Georgi, V. ; Georgi, Leopold ; Blechert, Martin ; Bergmeister, Merlin ; Zwanzig, Michael ; Wüstenhagen, Doreen A. ; Bier, Frank F. ; Jung, Erik ; Kubick, Stefan (2016)

Many pharmaceuticals are proteins or their development is based on proteins. Cell-free protein synthesis (CFPS) is an innovative alternative to conventional cell based systems which enables the production of proteins with complex and even new characteristics. However, the short lifetime, low protein production and expensive reagent costs are still limitations of CFPS. Novel automated microfluid...

Exceptional long-life performance of lithium-ion batteries using ionic liquid-based electrolytes

Elia, Giuseppe Antonio ; Ulissi, Ulderico ; Jeong, Sangsik ; Passerini, Stefano ; Hassoun, Jusef (2016)

Advanced ionic liquid-based electrolytes are herein characterized for application in high performance lithium-ion batteries. The electrolytes based on either N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (Pyr(14)TFSI), N-butyl-N-methylpyrrolidinium bis(fluoro-sulfonyl) imide (Pyr(14)FSI), N-methoxy-ethyl-N-methylpyrrolidinium bis(trifluoromethane-sulfonyl) imide (Pyr(12O1)TF...

Fabrication and characterization of nanotextures for light management in photovoltaic and optoelectronic devices

Jošt, Marko (2017)

Light management is an important aspect of photovoltaics to assure efficient exploitation of solar energy and improve the efficiency of solar cells. Efficient light management is based on anti-reflection and light scattering. The former results in increased light in-coupling, and the latter prolongs the optical path in the active layer of a solar cell; consequently, the conversion efficiency in...

Interdigitated back-contacts for poly-crystalline thin-film silicon solar cells on glass

Sonntag, Paul (2017)

This thesis is about the liquid phase crystallization (LPC) technology to produce solar cell absorbers of 10 − 40 µm thickness directly on glass, the development of interdigitated back-contact (IBC)-silicon hetero-junction (SHJ) solar cells thereon and the evaluation of material parameters and future prospects of the LPC technology. The latter is a new hybrid technology between wafers and class...

Waveguide integrated MQW p-i-n photodiodes

Zhou, Gan (2017)

In this work, waveguide integrated multiple quantum well p-i-n photodiodes are developed and characterized. Compared to bulk photodiodes, multiple quantum well photodiodes have special properties including a large and tunable polarization dependent loss. It makes multiple quantum well photodiodes a potential candidate for various applications, especially in polarization-diversity coherent optic...

Fiber optical parametric amplifiers in optical communication systems

Marhic, Michel E. ; Andrekson, Peter A. ; Petropoulos, Periklis ; Radic, Stojan ; Peucheret, Christophe ; Jazayerifar, Mahmoud (2015)

The prospects for using fiber optical parametric amplifiers (OPAs) in optical communication systems are reviewed. Phase-insensitive amplifiers (PIAs) and phase-sensitive amplifiers (PSAs) are considered. Low-penalty amplification at/or near 1 Tb/s has been achieved, for both wavelength- and time-division multiplexed formats. High-quality mid-span spectral inversion has been demonstrated at 0.64...

Liquid phase crystallized silicon on sinusoidal textured glass substrates

Köppel, Grit (2017)

The aim of this thesis is to identify a light trapping scheme for liquid phase crystallized silicon thin-film solar cells providing anti-reflective properties in the wavelength range of interest and to demonstrate its suitability for maintaining the silicon material quality. Since the silicon material quality is mainly determined by the crystallization step, the interplay between a substrate te...

Contactless visible light probing for nanoscale ICs through 10 μm bulk silicon

Boit, Christian ; Lohrke, Heiko ; Scholz, Philipp ; Beyreuther, Anne ; Kerst, Uwe ; Iwaki, Y. (2015)

This paper explains why only optical techniques will be able to provide debug and diagnosis of bulk silicon FinFET technologies. In order to apply optical techniques through a convenient thickness of silicon on the one hand, light is limited to NIR to minimize absorption. To match resolution requirements on the other hand, it becomes mandatory to use shorter wavelengths. Two key issues have to ...

Nanocrystalline silicon and silicon oxide contact layers for silicon heterojunction solar cells

Mazzarella, Luana (2017)

Crystalline-silicon solar cells are presently the main technology to supply the rapidly growing market for competitive photovoltaic electricity. To drive conversion efficiency of such cells further up, silicon heterojunction (SHJ) solar cells are promising. This thesis addresses strategies to improve the efficiency of such cells by the integration of nanocrystalline silicon (nc-Si:H) and nanoc...

Differentieller Mikrowellen-Leistungsoszillator für die Realisierung ultrakompakter Plasmaquellen in Matrixanordnung

Bansleben, Christian (2017)

In der vorliegenden Arbeit werden neue Ansätze zur Realisierung besonders platzsparender und effizienter Mikrowellengeneratoren im Leistungsbereich bis 50 W auf Basis von Leistungsoszillatoren demonstriert. Mit einer substanziellen Einsparung an Schaltungsfläche gegenüber den konventionellen Generatorkonzepten lassen sich bislang unerreichbare Anwendungsfelder erschließen. Einen besonders innov...

Transient Liquid Phase Soldering als Verbindungstechnik leistungselektronischer Halbleiter für Hochtemperaturanwendungen

Ehrhardt, Christian (2017)

In zahlreichen Anwendungsfeldern der Elektronik besteht der Wunsch oder die Notwendigkeit die Einsatztemperatur des elektronischen Moduls zu erhöhen, wie beispielsweise in der Leistungselektronik, um aufwändige Kühlsysteme einzusparen. Dazu bedarf es Bauteile, Substratmaterialien und Verbindungstechniken, welche zuverlässig bei diesen erhöhten Betriebstemperaturen sind. Die derzeit am häufigste...

Deposition von transparenten leitfähigen Oxiden mit hoher Ladungsträgermobilität bei niedriger Prozesstemperatur und deren Integration in Photovoltaik-Zellen

Scherg-Kurmes, Harald (2017)

Transparent conductive oxides (TCOs) are employed as contact layers thin film solar cells. They transmit incoming light to the absorber and conduct the generated charge carriers laterally to the metal contacts. Thus, the TCO should have a high optical transparency as well as a high electrical conductivity to ensure good solar cell performance. The free charge carriers, which are necessary for t...

Charakterisierung nanoskaliger Schichtstapel durch eine Kombination aus referenzprobenfreier Röntgenspektroskopie unter streifendem Einfall und der Röntgenreflektometrie

Hönicke, Philipp Werner (2016)

Eine genaue und zerstörungsfreie tiefenabhängige Charakterisierung nanoskaliger Schichtsysteme ist ein essentielles Thema in vielen Bereichen der aktuellen Forschung. Besonders die sogenannten Nanolaminat-Schichten, wobei es sich um Stapel aus mehreren ultra dünnen Schichten handelt, sind technologisch für aktuelle und zukünftige elektronische Bauelemente sehr interessant. Allerdings erfordern ...

Spatially resolved refractive index detection based on SOI ring resonators

Jäger, Matthias (2016)

This PhD thesis addresses the application of silicon photonics for the examination of thin layers. Due to evanescent fields ring resonators that interact with their surroundings. This is used to obtain information about thin layers deposited on their surface. Waveguides that differ in geometry are used to generate evanescent fields of different penetration depth. The combination of multiple rin...

Signal generation for millimeter wave and THz applications in InP-DHBT and InP-on-BiCMOS technologies

Hossain, Muhammad Maruf (2016)

Increasing research activities in the mm-wave and sub-THz bands using different technologies have reached significant achievements over the past few years. A variety of commercial and defense applications are expected to be based on mm-wave and sub-Terahertz integrated circuits in the near future. Silicon-based technologies such as RF-CMOS and SiGe-BiCMOS have shown steady progress, but they ar...

V-band low noise amplifier and mixer design using 90 nm CMOS technology

Malignaggi, Andrea (2016)

This thesis is the result of more than three years research work at TU Berlin. Several radio frequency integrated circuits have been designed in a commercial CMOS technology, the TSMC 90nm, and measured on-wafer within the project WiONet. The author of this work has been focused on the design of the receiver part of a V-band high data-rate millimetre-wave transceiver and particularly on two imp...

Interfaces in amorphous/crystalline silicon heterojunction solar cells

Mews, Mathias (2016)

The passivation of the amorphous/crystalline silicon heterojunction (SHJ) and the hole transport across the same are the dominating topics in this thesis. The different chapters focus on: The influence of hydrogen on SHJ passivation and an alternative passivation process for surfaces with higher surface free energy, the application of anti-reflection nanostructures and the current generation in...

Line-shaped continuous wave laser crystallization of silicon on glass

Kühnapfel, Sven (2016)

Liquid phase crystallization is a promising technology to grow multicrystalline silicon thin films on glass substrates. As part of this work the influence of various sample stacks and materials were examined and their influence on the process window for line-shaped continuous wave laser crystallization is shown. A phase diagram for the crystallization of 10 µm thick silicon layers was recorded ...

Kerr nonlinearity compensation using polarization-independent fiber-based optical parametric amplifier in high-speed optical transmission systems

Sackey, Isaac (2016)

Kerr nonlinearity compensation in long-haul optical transmission networks has become necessary since the nonlinear impairment poses fundamental limits on the achievable transmission reach. Mid-link spectral inversion technique employing Fiber-based optical parametric amplifier (FOPA)s exhibit the capabilities for nonlinearity compensation through optical phase conjugation (OPC). However, the im...

Cylindrical and nonconformal material interfaces in the finite integration technique

Kirsch, Stefan (2016)

The present work addresses a fundamental issue of electromagnetic simulations by means of the Finite Integration Technique (FIT). This method is typically applied to Cartesian and, therefore, geometrically inflexible computational meshes. In order to achieve a high level of accuracy in a reasonable amount of time, the FIT commonly requires the simulated object's material interfaces to conform i...