A5023759797- Molecular Junctions and Nanostructures
- Advanced Memory and Neural Computing
- CCD and CMOS Imaging Sensors
- Gas Sensing Nanomaterials and Sensors
- Porphyrin and Phthalocyanine Chemistry
- Electronic and Structural Properties of Oxides
- Surface Chemistry and Catalysis
- Semiconductor materials and devices
- Analytical Chemistry and Sensors
- Magnetism in coordination complexes
- Organic Electronics and Photovoltaics
- Ferroelectric and Negative Capacitance Devices
- Electrochemical Analysis and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Ferroelectric and Piezoelectric Materials
- Metal complexes synthesis and properties
- Luminescence and Fluorescent Materials
- Modular Robots and Swarm Intelligence
- Advanced Optical Sensing Technologies
- Quantum and electron transport phenomena
- Advanced optical system design
- Advanced Materials and Mechanics
- Covalent Organic Framework Applications
- Ion-surface interactions and analysis
X-Fab (Germany)
2024
Leibniz Institute for Solid State and Materials Research
2012-2018
Chemnitz University of Technology
2012-2018
BioElectronics (United States)
2015-2016
Brazilian Synchrotron Light Laboratory
2011-2013
Universidade Estadual de Campinas (UNICAMP)
2011
The fabrication, characterization, and optimization of large area rolled‐up ultracompact nanomembrane‐based capacitor arrays is demonstrated by combining bottom‐up top‐down fabrication methods. scalability the process tested on a 4‐inch wafer platform where 1600 devices are manufactured in parallel. By using hybrid dielectric layer consisting HfO 2 TiO incorporated into an Al O 3 matrix, capacitors can have their capacitance per footprint increased over two orders magnitude. Their electrical...
Organic diodes consisting of molecular nano-pyramid structures sandwiched between metal and strained nanomembrane electrodes are created. The robust smooth contacts provided by self-curled layers render the nano-pyramids efficent channels for detecting nitrogen dioxide airflow.
A controlled shunting of polycrystalline oxide thin films on the nanometer length scale opens door to significantly modify their transport properties. In this paper, low energy Ar(+) irradiation induced effect forming-free, non-volatile resistive switching in BiFeO3 film capacitor-like structures with macroscopic bottom and top contacts was investigated. Oxygen atoms at surface are preferentially sputtered by ion oxygen vacancies a metallic Bi phase formed before deposition contacts....
High-energy radiation is known to potentially impact the optical performance of silicon-based sensors adversely. Nevertheless, a proper characterization and quantification possible spectral response degradation effects due UV stress technically challenging. On one hand, typical illumination methods via lamps provide poorly defined energy spectrum. other standardized measurement methodology also missing. This work provides an approach where well-defined spectrum conditions are guaranteed...
Organic materials such as phthalocyanine-based systems present a great potential for organic device applications due to the possibility of integrating films different create heterostructures which combine electrical capabilities each material. This opens precisely engineer and tune new properties. In particular, similar transition metal phthalocyanines demonstrate hybridization charge transfer properties could lead interesting physical phenomena. Although, when considering dimensions, better...
Magneto-optical Kerr rotation of thin films TbPc<sub>2</sub> single molecule magnets can be tuned at room temperature within almost two orders magnitude by the choice substrate.
Scanning probe lithography as a mean to pattern, implement, and discover new devices in different materials systems provides an elevated degree of flexibility, permitting one tailor device geometries structures at will, particular by virtue modification the local chemistry. Here we define metal-insulator-metal junctions exhibiting switchable rectifier behavior patterning titanium channels through anodic oxidation techniques. The nanoscale TiO2 thus formed exhibit IV characteristics with...
Short-period multilayers containing ultrathin atomic layers of Al embedded in titanium dioxide (TiO(2)) film-here called single-pulse doped multilayers-are fabricated by layer deposition (ALD) growth methods. The approach explored here is to use atoms through single-pulsed locally modify the chemical environment TiO(2) films, establishing a control over resistive switching properties metal/oxide/metal devices. We show that this simple methodology can be employed produce well-defined and...
The optical and electrical properties of terbium(III) bis(phthalocyanine) (TbPc 2 ) films on cobalt substrates were studied using variable angle spectroscopic ellipsometry (VASE) current sensing atomic force microscopy (cs-AFM). Thin TbPc with a thickness between 18 nm 87 prepared by organic molecular beam deposition onto layer grown electron evaporation. orientation the molecules metallic film was estimated from analysis data. A detailed AFM topography shows that consist islands which...
Resistive switching (RS) has been investigated in unstructured, polycrystalline BiFeO3 thin films with an emphasis on the possibility to downscale top electrode size. Reproducible RS can be shown for large-scale and bottom electrodes. However, distinguishable is observed when downscaled grain The microscopic conduction found take place within grains. We demonstrate recovery of homogeneous electrodes reduced conductive unit size by decreasing film thickness.
Here, we demonstrate the fabrication, characterization, and tailoring of porous organic nanomembranes their direct integration on inorganic substrates for sensing applications. The chemically prepared can be integrated both conducting insulating by either transfer or synthesis. We also successfully use detection commonly used acids including HCl, H(2)SO(4), H(3)PO(4) respective counterions, chlorides, sulfates, phosphates. Impressively, in situ acid is achieved down to 5 nmol·L(-1), while...
Abstract The tailoring of organic systems is crucial to further extend the efficiency charge transfer mechanisms and represents a cornerstone for molecular device technologies. However, this demands control electrical properties understanding physics behind interfaces. Here, quantitative spatial overview work function characteristics phthalocyanine architectures on Au substrates provided via kelvin probe microscopy. While macroscopic investigations are very informative, current approach...
The investigation of charge transport in organic nanocrystals is essential to understand nanoscale physical properties systems and the development novel nanodevices. In this work, we fabricate nanocrystal diodes contacted by rolled-up robust nanomembranes. consist vanadyl phthalocyanine copper hexadecafluorophthalocyanine heterojunctions. temperature dependent through was investigated reveal ohmic space-charge-limited current under different conditions, for instance, bias.
This work reports on nanoscale and microscale metal oxide gas sensors, consisting of metal-semiconductor-metal barriers designed via scanning probe microscopy. Two distinct oxides, molybdenum titanium were tested at different temperatures using CO 2 H as test gases. Sensitivities down to ppm levels are demonstrated, the influence dry humid working atmospheres these conductivities was studied. Furthermore, activation energy evaluated analyzed within sensor temperature range. Finally, full...
Abstract A new strategy for the fixation of redox‐active dinickel(II) complexes with high‐spin ground states to gold surfaces was developed. The complex [Ni 2 L(Cl)]ClO 4 ( 1 ClO ), in which L 2− represents a 24‐membered macrocyclic hexaaza‐dithiophenolate ligand, reacts ambidentate 4‐(diphenylphosphino)benzoate (dppba) form carboxylato‐bridged L(dppba)] + , can be isolated as an air‐stable perchlorate L(dppba)]ClO ) or tetraphenylborate L(dppba)]BPh BPh salt. auration probed on molecular...
Subsequent treatment of H2TPP(CO2H)4 (tetra(p-carboxylic acid phenyl)porphyrin, 1) with an excess oxalyl chloride and HNR2 afforded H2TPP(C(O)NR2)4 (R = Me, 2; iPr, 3) yields exceeding 80%. The porphyrins 2 3 could be converted to the corresponding metalloporphyrins MTPP(C(O)NR2)4 Me/iPr for M Zn (2a, 3a); Cu (2b, 3b); Ni (2c, 3c); Co (2d, 3d)) by addition equiv anhydrous MCl2 (M Zn, Cu, Ni, Co) dimethylformamide solutions at elevated temperatures. Metalloporphyrins 2a-d 3a-d were obtained...
In this work, we make use of an atomic layer deposition (ALD) surface reaction based on trimethyl-aluminum (TMA) and water to modify O-H terminated self-assembled layers octadecylphosphonic acid (OPA). The structural modifications were investigated by X-ray reflectivity, diffraction, force microscopy. We observed a significant improvement in the thermal stability ALD-modified molecules, with existence supramolecular packing structure up 500 °C. Following experimental observations, density...
Miniaturization of electronic devices and reduction their footprint areas are essential ingredients towards efficient development energy autonomous systems. In article number 1301631, César Bof Bufon, Daniel Grimm, co-workers demonstrate the feasibility fabricating ultracompact storage elements employing rolled-up nanotechnology. They highlight flexibility high yield parallel fabrication process, which results in a substantial device dimensions better integration into future miniaturized
To get a reliable detection of UV light, several issues must be solved. Impacting factors on the device and system level will discussed. The paper starts with material property aspects silicon-based photodetectors, progresses to construction readout complement important aspect reliability.