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  • Publications 2019

Publications 2019

since January 2019

(1) Control of Electron State Coupling in Asymmetric Ge/GeSi Quantum Wells
C. Ciano, M. Virgilio, M. Montanari, L. Persichetti, L. Di Gaspare, M. Ortolani, L. Baldassarre, M.H. Zoellner, O. Skibitzki, G.Scalari, J. Faist, D.J. Paul, M. Scuderi, G. Nicotra, T. Grange, S. Birner, G. Capellini, and M. De Seta
Physical Review Applied 11(1), 014003 (2019)
Theoretical predictions indicate that the n-type Ge/Si-Ge multi-quantum-well system is the most promising material for the realization of a Si-compatible THz quantum cascade laser operating at room temperature. To advance in this direction, we study, both experimentally and theoretically, asymmetric coupled multi-quantum-well samples based on this material system, that can be considered as the basic building block of a cascade architecture. Extensive structural characterization shows the high material quality of strain-symmetrized structures grown by chemical vapor deposition, down to the ultrathin barrier limit. Moreover, THz absorption spectroscopy measurements supported by theoretical modeling unambiguously demonstrate inter-well coupling and wavefunction tunneling. The agreement between experimental data and simulations allows us to characterize the tunneling barrier parameters and, in turn, achieve highly controlled engineering of the electronic structure in forthcoming unipolar cascade systems based on n-type Ge/Si-Ge multi-quantum-wells.

(2) Room Temperature Operation of N-Type Ge/SiGe Terahertz Quantum Cascade Lasers Predicted by Non-Equilibrium Green’s Functions
T. Grange, D. Stark, G. Scalari, J. Faist, L. Persichetti, L. Di Gaspare, M. De Seta, M. Ortolani, D.J. Paul, G. Capellini, S. Birner, M. Virgilio
Applied Physics Letters 114(11), 111102 (2019)

(3) Comparison of Plasma-Enhanced Atomic Layer Deposition AlN Films Prepared with Different Plasma Sources
M. Kot, K. Henkel, F. Naumann, H. Gargouri, L. Lupina, V. Wilker, P. Kus, E. Pozarowska, S. Garain, Z. Rouissi, D. Schmeisser
Journal of Vacuum Science and Technology A 37(2), 020913 (2019)

(4) Processing and Integration of Graphene in a 200 mm Wafer Si Technology Environment
M. Lisker, M. Lukosius, M. Fraschke, J. Kitzmann, J. Dabrowski, O. Fursenko, P. Kulse, K. Schulz, A. Krüger, J. Drews, S. Schulze, D. Wolansky, A.M. Schubert, J. Katzer, D. Stolarek, I. Costina, A. Wolff, G. Dziallas, F. Coccetti, A. Mai
Microelectronic Engineering 205, 44 (2019)
We present insights into processes of cleaning, patterning, encapsulation, and contacting graphene in a 200mm wafer pilot line routinely used for the fabrication of integrated circuits in Si technologies. We demonstrate key process steps and discuss challenges and roadblocks which need to be overcome to enable integration of this material with Si technologies.

(5) Analysis of Parasitic Effects in Filamentary-Switching Memristive Memories using an Approximated Verilog-A Memristor Model
N. Lupo, E. Perez, Ch. Wenger, F. Maloberti, E. Bonizzoni
IEEE Transactions on Circuits and Systems I 66(5), 1935 (2019)

(6) The Electronic Structure of ε-Ga2O3
M. Mulazzi, F. Reichmann, A. Becker, W M. Klesse, P. Alippi, V. Fiorentini, A. Parisini, M. Bosi, R. Fornari
Applied Physics Letters Materials 7, 022522 (2019)
The electronic structure of ε-Ga2O3 thin films has been investigated by ab initio calculations and photoemission spectroscopy with UV, soft and hard X-rays to probe the surface and bulk properties. The latter measurements reveal a peculiar satellite structure in the Ga 2p core level spectrum, absent at the surface, and a core-level broadening that can be attributed to photoelectron recoil. The photoemission experiments indicate that the energy separation between valence band and Fermi level is about 4.4 eV, a valence band maximum (VBM) at the Г point and an effective mass of the highest lying bands of - 4.2 free electron masses. The value of the band gap compares well with that obtained by optical experiments and with calculations done using a hybrid density-functional, which also reproduce well the dispersion and density of states.

(7) Operando Diagnostic Detection of Interfacial Oxygen “Breathing” of Resistive Random Access Memory by Bulk-Sensitive Hard X-Ray Photoelectron Spectroscopy
G. Niu, P. Calka, P. Huang, S.U. Sharath, S. Petzold, A. Gloskovskii, K. Fröhlich, Y. Zhao, J. Kang, M.A. Schubert, F. Bärwolf, W. Ren, Z.-G. Ye,, E. Perez, C. Wenger, L. Alff, T. Schoeder
Materials Research Letters 7(3), 117 (2019)

(8) Shallow and Undoped Germanium Quantum Wells: A Playground for Spin and Hybrid Quantum Technology
A. Sammak, D. Sabbagh, N.W. Hendrickx, M. Lodari, B.P. Wuetz, A. Tosato, L. Yeoh, M. Bollani, M. Virgilio, M.A. Schubert, P. Zaumseil, G. Capellini,, M. Veldhorst, G. Scappucci
Advanced Functional Materials 1807613 (2019)

(9) Inherent Stochastic Learning in CMOS Integrated HfO2 Arrays for Neuromorphic Computing
Ch. Wenger, F. Zahari, M.K. Mahadevaiah, E. Perez, I. Beckers, H. Kohlstedt, M. Ziegler
IEEE Electron Device Letters 40(4), 639 (2019)

(10) Development of a Portable Dielectric Biosensor for Rapid Detection of Viscosity Variations and Its In-Vitro Evaluations using Saliva Samples of COPD Patients and Healthy Control
P.S. Zarrin, F.I. Jamal, N. Roeckendorf, Ch. Wenger
Healthcare (MDPI) 7(1), 11 (2019)
Chronic Obstructive Pulmonary Disease (COPD) is a life-threatening lung disease affecting millions of people worldwide. Although majority of patients with objective COPD go undiagnosed until late stages of their disease, recent studies suggest that the regular screening of sputum viscosity could provide important information on the disease detection. Since the viscosity of sputum is mainly defined by its mucin-protein and water contents, dielectric biosensors can be used for detection of viscosity variations by screening changes in sputum's contents. Therefore, the objective of this work was to develop a portable dielectric biosensor for rapid detection of viscosity changes and to evaluate its clinical performance in characterizing viscosity differences of saliva samples collected from COPD patients and Healthy Control (HC). For this purpose, a portable dielectric biosensor, capable of providing real-time measurements, was developed. The sensor performance for dielectric characterization of mediums with high water contents, such as saliva, was evaluated using isopropanol-water mixtures. Subsequently, saliva samples, collected from COPD patients and HC, were investigated for clinical assessments. The radio frequency biosensor provided high repeatability of 1.1% throughout experiments. High repeatability, ease of cleaning, low-cost, and portability of the biosensor made it a suitable technology for point-of-care applications.

The building and the infrastructure of the IHP were funded by the European Regional Development Fund of the European Union, funds of the Federal Government and also funds of the Federal State of Brandenburg.