A5004477265- Organic Electronics and Photovoltaics
- Thin-Film Transistor Technologies
- Nanofabrication and Lithography Techniques
- Conducting polymers and applications
- Analytical Chemistry and Sensors
- Force Microscopy Techniques and Applications
- Organic Light-Emitting Diodes Research
- Advanced Sensor and Energy Harvesting Materials
- Advanced Memory and Neural Computing
- Nanowire Synthesis and Applications
- Molecular Junctions and Nanostructures
- Advancements in Semiconductor Devices and Circuit Design
- X-ray Diffraction in Crystallography
- Additive Manufacturing and 3D Printing Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Advancements in Photolithography Techniques
- Semiconductor materials and interfaces
- Semiconductor materials and devices
- Semiconductor Lasers and Optical Devices
- Electron and X-Ray Spectroscopy Techniques
- Advanced Surface Polishing Techniques
- Fullerene Chemistry and Applications
- Advanced ceramic materials synthesis
- Radiomics and Machine Learning in Medical Imaging
- Inorganic Fluorides and Related Compounds
Joanneum Research
2011-2025
NanoTecCenter Weiz Forschungsgesellschaft (Austria)
2007-2009
Institute of Nanostructured Materials
2008
Austin Hospital
2007
The University of Melbourne
2007
Institute of Solid State Physics
2003
Graz University of Technology
1999
Hamburg University of Technology
1995
Organic field effect transistors with a nanocomposite gate of ZrO2 and poly(α-methyl styrene) (see figure, left) show performances close to the theoretically possible limit, interface trap densities comparing favorably current state art in silicon microelectronics. They are not only key elements flexible electronics, but also low-cost, high-end sensors, as demonstrated optothermal sensing right).
Abstract In this study we report on the optimization of contact resistance by surface treatment in short‐channel bottom‐contact OTFTs based pentacene as semiconductor and SiO 2 gate dielectric. The devices have been fabricated means nanoimprint lithography with channel lengths range 0.3 μm < L 3.0 μm. order to reduce Au source‐ drain‐contacts were subjected a special UV/ozone treatment, which induced formation thin AuO x layer. It turned out, that is very effective (i) decreasing...
We have fabricated a large body of pentacene thin films on different organic and inorganic dielectric materials at four substrate temperatures with nominal film thicknesses ranging from the submonolayer over multilayer to ``thick'' regime. These were characterized by atomic force microscopy analyzed quantitatively means scaling rate equation theory in order deduce molecular growth dynamics substrates that are used as gate dielectrics transistors. found all temperature range...
We report on the natural source based and biodegradable material cellulose Al2O3 as ultrathin hybrid high-k dielectric layer for applications in green electronics. Dielectric films of 16 nm (ε ≈ 8.4) 8 9) exhibit low leakage currents up to electric fields 1.5 MV/cm. Pentacene C60 organic thin film transistors show a well-balanced performance with operation voltages around 2 V. They are implemented complementary inverters excellent switching behavior, small-signal gain 60 exceptionally high...
The impact of intramolecular polar bonds (IPBs) on the energy level alignment in layered systems rodlike conjugated molecules standing substrate was investigated for pentacene (PEN) and perfluoropentacene (PFP) SiO2 using ultraviolet photoelectron spectroscopy. A remarkably large offset 1.75 eV found between highest occupied molecular orbital (HOMO) levels PEN PFP caused by IPBs at surface layers. This HOMO-level results a narrow intermolecular gap approximately 0.4 interface However,...
A nanoimprinting process that enables fabrication of self-aligned p- and n-type organic thin film transistors with small channel lengths is presented. Nanoimprint lithography back-side exposure permit precise definition the length down to submicrometer regime a diminutive gate source/drain overlap. The manufacturing transistor setups minimized electrode overlaps resulting in distinct decrease parasitic capacitances considerable increase transition frequency. Fully functional OTFTs...
A photopatternable elastomer [poly(butadiene‐ co ‐(4‐vinylbenzyl thiocyanate)] bearing UV‐sensitive thiocyanate (–SCN) groups, which isomerize to isothiocyanate (–NCS) units upon irradiation with UV light, is reported. This isomerization changes the refractive index of elastomer, enabling production and relief distributed feedback (DFB) gratings using interference lithography. Blending a laser dye into creates an optically pumped laser, which, when strained, allows continuous reversible...
Abstract We report on the morphological aspects of thin films prepared from a blue–green light‐emitting conjugated polymer, (methyl‐substituted ladder‐type poly( p ‐phenylene, mLPPP)), blended with solid‐state electrolyte composed either by crown ether, dicyclohexano‐18‐crown‐6 (DCH18C6), or high‐molecular‐weight poly(ethylene oxide) (HMWPEO), and Li salt, lithium trifluoromethanesulfonate (LiCF 3 SO , triflate (LiTf)), as they have been successfully applied in electrochemical cells (LECs)....
A compact, integrated photoluminescence based oxygen and pH sensor, utilizing an organic light emitting device (OLED) as the source photodiode (OPD) detection unit, is described. The main challenge in such sensor suppression of excitation at detector, which typically by many orders magnitude higher intensity than emitted fluorescence. In our approach, we refrain from edge filters require narrow band sources dyes with adequate large Stokes shift. We rather developed concept relying on two...
The insertion of a thin photoacid generator layer between the dielectric and active in organic thin-film transistors (OTFTs) allows control threshold voltage through UV illumination by means interfacial channel doping. All p-type inverters can be realized combining an OTFT working depletion mode one operating enhancement mode. In recent years, have attracted great deal attention due to their potential applications low cost sensors,1 memory cards,2 integrated circuits.3 Great efforts are...
We report on the fabrication and characterisation of entirely inkjet-printed organic electrochemical transistors (OECTs) based poly(3,4-ethylenedioxithiophene) poly(styrenesulfonate) (PEDOT:PSS). These were used to evaluate assumed geometry-performance relationship OECTs by changing transistor dimensions monitoring output characteristics. could show that on-current depends PEDOT:PSS thickness on-to-off current ratio is related distance between printed electrodes. Taking these results into...
Abstract Photonics technologies play a crucial role in driving technological advancements within the agrifood industry, aiming to deliver sustainable food and agriculture, offering healthy, nutritious safe for all of us. Particularly, optical sensors imaging systems, together with machine-learning processing advanced lighting, pivotal monitoring crop soil health unprecedented precision, while safeguarding supply chain. This roadmap aims provide an overview state-of-the-art photonics...
Lateral flow tests (LFTs) had a pivotal role in combating the spread of SARS-CoV-2 virus throughout COVID-19 pandemic thanks to their affordability and ease use. Most LFT devices were based on nitrocellulose membrane strips whose industrial upscaling billions has already been extensively demonstrated. Nevertheless, assay option an format is largely restricted qualitative detection target antigens. In this research, we surveyed potential UV nanoimprint lithography (UV-NIL) extrusion coating...
Calculation of the geometric part G profile shape is recently developed fundamental parameters model. A Monte Carlo raytracing algorithm used to describe realistic conditions such as multiple slits/collimators, dimension secondary monochromator and complicated specimen shape. To model X-ray source more exactly, we successfully introduced a correction for tube tails. relevant (6%…30%) X-rays produced not from proper rectangular line focus but supplementary tails on both sides optical focus....
Roll-to-roll UV nanoimprint lithography has superior advantages for high-throughput manufacturing of micro- or nano-structures on flexible polymer foils with various geometries and configurations. Our pilot line provides large-scale structure imprinting cost-effective biochips (4500 biochips/hour), enabling rapid multiplexed detections. A complete high-volume process chain the technology producing structures like μ-sized, triangular optical out-couplers capillary channels (width: from 1 μm...
The growth and the electronic properties of sexithiophene thin films on silicon surfaces have been studied by angle resolved ultraviolet photoelectron spectroscopy while morphology crystalline order assessed atomic force microscopy x-ray diffraction. influence surface modification substrate as well temperature rate were investigated in ultrahigh vacuum through controlled multistep sequences ranging from (sub)monolayer coverage up to thick films. Depending preparation, two electronically...
The authors demonstrate the fabrication of organic thin film transistors (OTFTs) based on pentacene with submicron channels flexible substrates. Nanoimprint lithography is used for patterning source and drain electrodes processed directly spin-on gate dielectric, structured electrode, substrate. use sub-100-nm dielectrics enables full current saturation devices channel lengths down to 500nm. OTFTs exhibit negative threshold voltages an absolute value well below 5V have subthreshold swings...