Description
Participants' contributions will be presented at poster sessions divided into several blocks according to the topics.
Self-assembly of organic and metal-organic species is a thrilling field, which exploits the mechanisms of supramolecular chemistry to build complex molecular entities [1]. Recently, this field has been tried at surfaces [2], where multiple two-dimensional structures with various functional properties can be synthesized. At the time, there is abundant information on resulting thermodynamically...
Molecular self-assembly is an atomically precise approach for the fabrication of organic layers with tailored functionality. We present multi-component molecular phases of 4,4'-biphenyl dicarboxylic acid self-assembled on Ag(001) and their transformations for sub-monolayer and full monolayer coverages are followed by LEEM, STM, and XPS. Specific mixtures of intact, partially-, and fully...
Abstract:
The deformation twinning in hcp crystals have been extensively researched nowadays due to the dominant role it plays in the plastic deformation and strengthening mechanisms of materials. The twin boundary migration plays a significant role in the microstructure evolution of metallic materials. The knowledge of migration mechanisms under applied stress can be considered as a basis...
High-resolution and high surface-sensitive in-situ core-level photoelectron spectra will be presented and briefly discussed.
The main purpose of the work is to study the intricate and complex phenomena occurring at the surface and interface during the growth mechanism of Ga, Al, GaN on SiC, including the analysis of heterostructures. All the processes are followed in-situ by photoelectron...
Using topological band theory and by means of density functional theory, tight-binding and GW calculations, we can show that polymers near the topological transition point can transition from a trivial quantum phase to a non-trivial one. This transition between two insulators must proceed via closure of the electronic gap.
By employing on-surface synthesis with custom-designed precursors...
Plasmonic antennas are often fabricated by lithographic patterning of a thin metallic film and its properties are then intimately related to the quality of the resulting structures. Here we compare two kinds of thin gold films: polycrystalline thin film deposited by magnetron sputtering, and chemically synthesized monocrystalline gold platelet. Both metallic substrates were used to fabricate...
The semiconductor–metal transition (SMT) enables multiple applications of one single material, especially in modern devices. How to control it remains one of the most intriguing questions in material physics/chemistry, especially in two-dimensional layered materials. In this work, we report realization of SMT in MoS2–xOx bilayers, driven by the concentration gradient of the chalcogen atom...
Scanning electron microscopy (SEM) and atomic force microscopy (AFM) are two of the most used, complementary techniques for surface analysis at the nanoscale. Thus, combining them by integrating a compact AFM into SEM brings novel possibilities for true correlative imaging and advanced multi-modal sample characterization that would be often unfeasible using each imaging modality...
Non-contact atomic force microscopy is a versatile tool to investigate properties of individual atoms or molecules. Here we report a novel approach to determine the acidity of individual surface hydroxyls, which is directly linked to the proton affinity (PA) of the involved O atoms. The PA - the tendency to gain or lose a proton - is crucial e.g. in acid-base catalysis and the electro- and...
Doping is a key process in semiconductor industry, in which the host electronic structure and carrier concentration are modified. When the semiconductor is doped, doping elements with the required electronic properties are introduced into its structure. Dopant introduction processes are either based on diffusion from gaseous phase or on ion implementation, where doping agents are implemented...
On-surface chemistry represents a fast-growing field allowing to synthetize molecular structures not available by traditional wet chemistry. In combination with high-resolution scanning probe technique providing the unprecedented spatial resolution, individual products of reactions can be precisely identified. Nevertheless, a deep understanding of the reaction mechanism under the conditions...
During the last decade, an increasing number of papers indicated that 2D materials are transparent to intermolecular interactions [1,2,3]. This phenomenon leads to the fact that electronic properties of underlying surface can penetrate through 2D materials, and was demonstrated by e.g. substrate-governed epitaxial growth on top of a 2D material interfacial layer [2,3].
The strength of...
Surface-guided planar nanowires show a lot of promise for integration into practical devices [1], but that is conditioned upon understanding their synthesis in detail. In this work, we investigate the VLS growth of ZnSe nanowires by chemical vapor deposition, guided by the steps on annealed M-plane sapphire substrate [2].
We have developed a reactor compatible with SEM and, although the...
Gold nanocones can show several plasmonic resonances and can be used to enhance light–matter interactions or for location-specific plasmonic sensing. Their fabrication often utilizes so-called self-shading effect, which occurs during metal film evaporation into circular nanowells. We present a view on the fabrication of ordered arrays of gold nanocones using electron beam lithography and...
STEM-EELS has become a standard technique to map localized surface plasmon resonances (LSPR), which are collective oscillations of free electrons in metal nano- and microstructures. Despite that many works dealing with EELS measurement of LSPR have been published over the last 15 years, there has been no experimental work discussing the experimental conditions during the measurement....
InGaN/GaN quantum well (QW) structures are commonly used in LEDs and laser applications [1]. Under certain growth conditions, hexagonal V shaped pits (V pits) are formed. These V pits may enlarge during the growth and their density is connected with density of dislocations containing a screw component. These V pits have large impact on optical properties of the samples [2]. Therefore,...
A biological membrane forms a dynamic and complex barrier between compartments of the living cell and its environment. However, its in vivo studies are difficult because it consists of a high variety of lipids and proteins and is continuously reorganized by the cell. Giant unilamellar vesicles (GUVs) are a powerful model system of the cell membrane due to their comparable size and membrane...
Abstract:
One of the ways to reduce the CO2 concentration in air is to convert it to any valuable product(s), such as fuels. This can be achieved by employing photo-electrochemical route. However, this is an energy intensive technique and almost 50% cost of fuel production goes into the applied electrical power. The success of this technique can be achieved if the applied power is derived from...
Morphological transitions of lipid membranes are thought to depend primarily on the chain length diversity of its components. However, the role of different lipid head groups, their counter ions and hydrating water molecules in the close proximity of the membrane on the gel-to-liquid phase transition of lipid is mostly unknown. We employed second harmonic (SH) scattering measurements to probe...
Nanocomposites of PMMA: BiOCl with different concentrations of BiOCl (5, 10, 15 wt%) were prepared by using simple solution cast technique. Prepared nanocomposites as well as BiOCl nanostructure characteristics were examined by using XRD, FESEM and EDAX. Morphology revels that the developed nanostructure of the filler (BiOCl) is of rose like geometry, which composed of dozens rapidly grown...
One of the ways to solve the rear-contact related limitations of dominant p-type c-Si homojunction solar technology is the implementation of the passivating contact. This type of contact typically consists of a layer stack, where one layer effectively passivates the surface of the Si wafer and another layer acts as a selective contact for one type of the charge-carriers. One of the possible...
Nitride semiconductors became the second most important semiconductor material after silicon in the last two decades. Many daily used devices, such as blue light emitting diodes or high electron mobility transistors in electronic devices, are based on nitride semiconductors. Despite the nitride devices mass production, there are many open questions and not well understood phenomena which have...
Full understanding of nanostructures' formation is a key for engineering of their physical properties. At nanoscale, this is a very challenging task. Electron microscopy is conventionally used for post-growth analysis of the fabricated nanostructures, and the growers have therefore no choice than perform time-consuming numerous experimental runs with uncertain results. These are often combined...
Defect states in semiconductors are one of the main focuses of all semiconductor studies. Many different approaches are used to determine the defect’s origin, character and densities. One of the often overlooked semiconductor’s parameters related to the defect states is the Urbach energy. It is an easily accessible measure of material disorder. Here, the process of obtaining the Urbach energy...
The key enabling factor for Spin Wave (SW) technology utilization for building ultra-low power circuits is the ability to energy efficiently cascade SW basic computation blocks. SW Majority gates, which constitute a universal gate set for this paradigm, operating on phase encoded data are not input output coherent in terms of SW amplitude. Thus, their cascading requires information...
Color filters enable photosensors to obtain spectral composition of incoming radiation, be it to mimic human vision or to separate analytical signals. Efforts to increase the resolution of these photosensors lead to decrease in size of individual picture elements – pixels, which places increasing demands on the color filter technology. Conventional color filters operating on the principle of...
Indium oxide (In$_2$O$_3$) is a ubiquitous material in OLEDs and photovoltaics
due to an ideally matched optical transmission window and
metal-like conductivity at room temperature when doped with Sn (as
ITO). When In$_2$O$_3$ is paired with organic materials, a nearly universal
fabrication step is the introduction of a thin organic buffer layer to improve
the charge injection efficiency...
Magnetic antiskyrmions may occur in cases where the magnetic chirality is anisotropic. In another word, DMI with opposite signs along two perpendicular directions can stabilize antiskyrmions [1]. They were theoretically predicted in certain tetragonal materials with D2d symmetry [2]. This topological spin structure plays a crucial role in low dimensional magnetic systems, where topological...
In recent days, magnetic materials, structures, and devices are getting more popular,
especially those related to spintronics. Research and development of such magnetic
samples require a way to observe magnetization with good spatial and temporal
resolution. Most dynamic changes of magnetization are realized in nanoseconds or even
faster. If we can detect these dynamic processes, we can...
Recent years have seen a growing interest in strong coupling between plasmons and excitons, as a way to generate new quantum optical testbeds and influence chemical dynamics and reactivity. Strong coupling to bright plasmonic modes has been achieved even with single quantum emitters. Dark plasmonic modes fare better in some applications due to longer lifetimes, but are difficult to probe as...
X-ray Photoelectron Spectroscopy is frequently used method for elemental and chemical analysis of surfaces and ultra thin films. By using proper model, the method is also able to obtain information about morphology, for example thickness of ultra thin films. Information depth is dependent on energy of incident X-ray radiation, therefore it is twice higher in case of using Ag Lα (2984.3 eV)...
