A5061026819- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Semiconductor materials and devices
- Luminescence and Fluorescent Materials
- Molecular Junctions and Nanostructures
- Thin-Film Transistor Technologies
- Electron and X-Ray Spectroscopy Techniques
- Image and Signal Denoising Methods
- Organic and Molecular Conductors Research
- Radiation Effects in Electronics
- ZnO doping and properties
- Nanowire Synthesis and Applications
- Optical Coatings and Gratings
- Neural Networks and Applications
- Target Tracking and Data Fusion in Sensor Networks
- Advanced Chemical Physics Studies
- Anodic Oxide Films and Nanostructures
- Advanced Thermoelectric Materials and Devices
Fraunhofer Institute for Integrated Circuits IIS, Division Engineering of Adaptive Systems EAS
2023
TU Dresden
2016-2021
Institut für Technische und Angewandte Physik (Germany)
2017
A key breakthrough in modern electronics was the introduction of band structure engineering, design almost arbitrary electronic potential structures by alloying different semiconductors to continuously tune gap and band-edge energies. Implementation this approach organic has been hindered strong localization states these materials. We show that influence so far largely ignored long-range Coulomb interactions provides a workaround. Photoelectron spectroscopy confirms ionization energies...
Abstract The functionality of organic semiconductor devices crucially depends on molecular energies, namely the ionisation energy and electron affinity. Ionisation affinity values thin films are, however, sensitive to film morphology composition, making their prediction challenging. In a combined experimental simulation study zinc-phthalocyanine its fluorinated derivatives, we show that changes in as function orientation neat or mixing ratio blends are proportional quadrupole component along...
p-Type molecular doping of organic materials with high ionization energies (IEs) above 5.50 eV is still a challenge, limiting the use in high-performance light-emitting diodes (OLEDs). Here, we investigate dopant hexacyano-trimethylene-cyclopropane (CN6-CP) electron affinity 5.87 as p-dopant OLEDs. We show that CN6-CP can be used not only traditional hole transport material 4,4'-cyclohexylidenebis[ N, N-bis(4-methylphenyl)benzenamine] (TAPC, IE = eV) but also effectively dopes host...
Increasing the amount of charge carriers by molecular doping is important to improve function several organic electronic devices. In this work, we use highly fluorinated fullerene (C60F48) p-type dope common amorphous host materials. We observe a general relation between material's electrical conductivity and Seebeck coefficient, both strongly depending on energy level offset dopant. This suggests that efficiency at similar levels mainly determined electron transfer yield from Indeed, dopant...
Organic electronics is the technology enabling truly flexible electronic devices. However, despite continuous improvements in charge-carrier mobility, devices used for digital circuits based on organic field-effect transistors (OFETs) have still not achieved a commercial breakthrough. A substantial hurdle to realization of effective circuitry proper control threshold voltage Vth. Previous approaches include doping or self-assembled monolayers provide control. while monolayers-modified OFETs...
Abstract Organic light‐emitting materials exhibiting thermally activated delayed fluorescence (TADF) show great promise for improving display applications. Recently, intermolecular effects between emitting molecules have been given more attention, revealing strong solid‐state solvation or aggregation induced changes of sample performance. Implications this on device performance are not yet fully covered. In work, a thorough investigation novel TADF emitter, methyl...
Abstract In modern electronics, it is essential to adapt band structures by adjusting energy levels and gaps. At first sight, this “band structure engineering” seems impossible in organic semiconductors, which usually exhibit localized electronic states instead of Bloch bands. However, the strong Coulomb interaction semiconductors allows for a continuous shift ionization (IE) over wide range mixing molecules with halogenated derivatives that different quadrupole moments. Here, effect level...
This paper presents a comparative analysis of three sampling techniques for generating space points to develop Bayesian neural network (BNN) surrogate model synthetic second-order low-pass filter. The objective is assess the effectiveness and efficiency different methods in performance model. study draws inspiration from widely used such as uniform distribution, uniformly distributed random numbers, Latin Hypercube Sampling (LHS). results reveal that BNN achieves best when using LHS method...
With the aim of pushing knowledge and understanding on mixed films organic semiconductors forward, blends ZnPC F8ZnPC in different ratios are manufactured. The have a polycrystalline structure, as indicated by electron diffraction profiles infrared-spectroscopy. Photoluminescence data show completely spectra for blends, compared to pure materials, which can be ascribed suppressing excimer formation appearance new charge-transfer excitation between two molecules blends. This also seen optical...
Optical sensing based on plasmonic nanorod arrays witnesses an increased interest for device applications due to a manifold of benefits these structures, such as broadband optical tunability and low-cost bottom-up fabrication. Key this success is the assembly antenna mediated through high-quality anodized aluminum oxide (AAO) matrices. The present work reports greatly improved fabrication thin-film AAO matrices thin-films deposited by magnetron sputtering under controlled argon/oxygen...
Solution-processed metal oxide (MO) thin films have been extensively studied for use in thin-film transistors (TFTs) due to their high optical transparency, simplicity of fabrication methods, and electron mobility. Here, we report, the first time, improvement electronic properties solution-processed indium (InOx) by subsequent addition an organic p-type semiconductor material, here 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene), yielding organic–inorganic hybrid TFTs. The...
Multiple degradation mechanisms limit the lifetime of integrated circuits (ICs). Different aspects can be tackled with Design for Reliability approaches already during circuit design to avoid serious implications ICs in field. For example, aging simulations performed investigate impact transistors onto performance. Since these cause a significant verification effort, we work on efficiently feed reliability information back designers. This article discusses their application scenarios and benefits.
In modern electronics, it is essential to create almost arbitrary band structures by adjusting the energy bands and gap. Until now, structure engineering in organic semiconductors has not been possible, since they usually exhibit localized electronic states instead of bands. a recent publication [1], we showed that possible continuously shift ionization (IE) over wide range mixing them with halogenated derivatives. This tuning mechanism based on interactions excess charges mean quadrupole...
The efficiency of organic light-emitting diodes that utilize the principle thermally activated delayed fluorescence (TADF) depends sensitively on host material in which TADF emitter molecules (guests) are embedded. Potential loss processes “deconfinement,” transfer excitons from guest to host, and “dissociation,” formation intermolecular charge-transfer states. We investigate how both can be suppressed by studying photoluminescence efficiency, emission spectrum, time-resolved intensity eight...