25 citations · 104 across the 19 of their papers we have counts for
20 papers
Hydrogen at GaN(0001) surface control of Fermi level pinning: Mg activation of p-type conductivity -- Nakamura process deciphered
Konrad Sakowski, Pawel Strak, Pawel Kempisty +2
Ab initio calculations were used to disentangle the mystery of Nakamura activation of p-type in Mg doped MOVPE grown gallium nitride, the key process leading to the 2014 Nobel Priz…
Role of quasi-Fermi levels in Si- and Mg-related optical absorption in nitride laser diodes (LDs): material context
Konrad Sakowski, Cyprian Sobczak, Pawel Strak +5
Optical absorption and reabsorption of light emitted from active regions in nitride laser diodes (LDs) have been shown to reduce the light extraction efficiency of these devices. I…
Fundamentals of the metal contact to p-type GaN: new multilayer design
Konrad Sakowski, Paweł Strak, Stanislaw Krukowski
Electrical properties of contact to p-type nitride semiconductor devices, based on gallium nitride were simulated by ab initio and by drift-diffusion calculations. The contact elec…
Augmentation of the Electron Counting Rule with Ising Model
Karol Kawka, Pawel Kempisty, Konrad Sakowski +4
On semiconductor growth surfaces, surface reconstructions appear. Estimation of the reconstructed structures is essential for understanding and controlling growth phenomena. In thi…
Coulomb contribution to Shockley-Read-Hall (SRH) recombination
Konrad Sakowski, Pawel Strak, Pawel Kempisty +6
Defect-mediated nonradiative recombination, known as Shockley-Read-Hall (SRH) recombination is reformulated. The introduced model considers Coulomb attraction between charged deep…
Macrosteps dynamics and the growth of crystals and epitaxial layers
Stanislaw Krukowski, Konrad Sakowski, Paweł Strak +3
Step pattern stability of the vicinal surfaces during growth was analyzed using various surface kinetic models. It was shown that standard analysis of the vicinal surfaces provides…
Polarization doping ab initio verification of the concept charge conservation and nonlocality
Ashfaq Ahmad, Pawel Strak, Pawel Kempisty +10
In this work, we study the emergence of polarization doping in AlxGa1-xN layers with graded composition from a theoretical viewpoint. We demonstrate that the charge conservation la…
Modelling pathogen spread in a healthcare network: indirect patient movements
M. J. Piotrowska, K. Sakowski, A. Karch +4
A hybrid network--deterministic model for simulation of multiresistant pathogen spread in a healthcare system is presented. The model accounts for two paths of pathogen transmissio…
Phase-amplitude functional theory -- new ab initio calculation method for large size systems
Pawel Strak, Konrad Sakowski, Pawel Kempisty +1
New method for ab initio calculations of the properties of large size system based on phase-amplitude functional is presented. It is shown that Schrodinger equation for many electr…
Analysis of the hospital records from AOK Plus
Agata Lonc, Monika J. Piotrowska, Konrad Sakowski
We present analysis of anonymised admission/discharge data from insurance provider for Saxony and Thuringia (Germany) for years 2010--2016. Study of such data are necessary to deri…
Analysis of the AOK Lower Saxony hospitalisation records data (years 2008 -- 2015)
Monika J. Piotrowska, Konrad Sakowski
Multidrug-resistant Enterobacteriaceae (MDR-E) have become a major public health threat in many European countries. While traditional infection control strategies primarily target…
Comment to "Topological insulators and superconductors" by Xiao-Liang Qi and Shou-Cheng Zhang Reviews of Modern Physics 83, 1057 (2011)
Stanisław Krukowski, Paweł Kempisty, Paweł Strak +1
The paper reports on the solution in the semi-space corresponding to topological surface state. It was shown that the exponential surface state results from selection of the energy…
Comment to "Quantum Spin Hall Effect and Topological Phase Transition in HGTe Quantum Wells" by B. Andrei Bernevig, Taylor L. Hughes and Shou-Cheng Zhang Science 314, 1757 (2006)
Stanisław Krukowski, Paweł Kempisty, Paweł Strak +1
The manuscript contains Comment to "Quantum Spin Hall Effect and Topological Phase Transitio in HGTe Quantum Wells" by B. Andrei Bernevig, Taylor L. Hughes and Shou-Cheng Zhang Sci…
Exact method of determination of the recombination mode from time resolved photoluminescence data
Pawel Strak, Kamil Koronski, Kamil Sobczak +7
A method of data analysis is proposed for the determination of the carrier recombination processes in optically excited matter measured by time-resolved photoluminescence, differen…
Dissipation of the excess energy of the adsorbate- thermalization via electron transfer
Paweł Strak, Konrad Sakowski, Stanisław Krukowski
A new scenario of thermalization process of the adsorbate attached at solid surfaces is proposed. The scenario is based on existence of electric dipole layer in which the electron…
On Composite Discontinuous Galerkin Method for simulations of electric properties of semiconductor devices
Konrad Sakowski, Leszek Marcinkowski, Pawel Strak +2
In this paper, a variant of discretization of the van Roosbroeck equations in the equilibrium state with the Composite Discontinuous Galerkin Method for the rectangular domain is d…
General aspects of the vapor growth of semiconductor crystals - a study based on DFT simulations of the NH3/NH2 covered GaN(0001) surface in hydrogen ambient
Pawel Kempisty, Pawel Strak, Konrad Sakowski +1
Vapor growth of semiconductors is analyzed using recently obtained dependence of the adsorption energy on the electron charge transfer between the surface adsorbed species and the…
Energy of adsorption at semiconducting surfaces with Fermi level differently pinned -- ab initio study
Paweł Kempisty, Paweł Strak, Konrad Sakowski +1
It is shown that adsorption energy at semiconductor surfaces critically depends on the charge transfer to or from the adsorbed species. For the processes without the charge transfe…
Polarization and polarization induced electric field in nitrides - critical evaluation based on DFT studies
Pawel Strak, Pawel Kempisty, Konrad Sakowski +1
Density Functional Theory (DFT) calculations were used to evaluate polarity of group III nitrides, such as aluminum nitride (AlN), gallium nitride (GaN) and indium nitride (InN) pr…
Polarization analysis and Density Functional Theory (DFT) simulations of the electric field in InN/GaN multiple quantum wells (MQWs)
Z. Romanowski, P. Kempisty, K. Sakowski +1
Results of the first ab initio simulations of InN/GaN multiquantum well (MQW) system are presented. The DFT results confirm the presence of the polarization charge at InN/GaN inter…