A5049368548- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Molecular Junctions and Nanostructures
- Porphyrin and Phthalocyanine Chemistry
- Thin-Film Transistor Technologies
- Perovskite Materials and Applications
- Force Microscopy Techniques and Applications
- Synthesis and properties of polymers
- Analytical Chemistry and Sensors
- Advanced Chemical Physics Studies
- Luminescence and Fluorescent Materials
- Photochemistry and Electron Transfer Studies
- Advanced Chemical Sensor Technologies
- Nonlinear Optical Materials Research
- Spectroscopy and Laser Applications
- nanoparticles nucleation surface interactions
- Lipid Membrane Structure and Behavior
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Chemometric Analyses
- Organic Light-Emitting Diodes Research
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and devices
- Analytical Chemistry and Chromatography
- Spectroscopy and Quantum Chemical Studies
- Supramolecular Chemistry and Complexes
Kyoto University Institute for Chemical Research
2016-2025
Kyoto University
2016-2025
Instituto de Investigaciones Químicas
2014-2025
Kyoto Bunkyo University
2019-2025
Kyoto College of Medical Science
2020
Hole-collecting monolayers have drawn attention in perovskite solar cell research due to their ease of processing, high performance, and good durability. Since molecules the hole-collecting monolayer are typically composed functionalized π-conjugated structures, hole extraction is expected be more efficient when π-cores oriented face-on with respect adjacent surfaces. However, strategies for reliably controlling molecular orientation remain elusive. In this work, multiple phosphonic acid...
Abstract Connecting molecular-level phenomena to larger scales and, ultimately, sophisticated molecular systems that resemble living remains a considerable challenge in supramolecular chemistry. To this end, self-assembly at higher hierarchical levels has be understood and controlled. Here, we report unusual self-assembled structures formed from simple porphyrin derivative. Unexpectedly, one-dimensional (1D) polymer coiled give an Archimedean spiral. Our analysis of the polymerization by...
Interfaces in thin-film photovoltaics play a pivotal role determining device efficiency and longevity. In this work, the top surface treatment of mixed tin-lead (≈1.26 eV) halide perovskite films for p-i-n solar cells is studied. Charge extraction promoted by treating with piperazine. This compound reacts organic cations at surface, modifying structure tuning interfacial energy level alignment. addition, combined C60 pyrrolidine tris-acid (CPTA) reduces hysteresis leads to efficiencies up...
Abstract Perfluoroalkyl compounds are known to exhibit a hydrophobic character on the surface of material, although CF bond has large dipole, which should make molecular polar and hydrophilic. This inconsistency long been chemical matter be solved. Herein, stratified dipole‐arrays model is proposed: can fully hidden by forming two‐dimensional aggregate perfluoroalkyl (R f ) groups; this spontaneously induced dipole–dipole interaction arrays owing helical structure R group. In model, ‘short’...
Pentacene attracts a great deal of attention as basic material used in organic thin-film transistors for many years. is known to form highly ordered structure thin film, which the molecular long axis aligns perpendicularly substrate surface, i.e., end-on orientation. On other hand, face-on oriented where plane parallel substrate, has never been found on an inert represented by SiO2. As result, orientation believed be generated only specific substrates such metal single crystal. In present...
The potential of naphthalene-1,8:4,5-tetracarboxylic diimide (NDI-H) as a transparent electron-transporting material was examined. A soluble precursor designed and synthesized having two tert-butoxycarbonyl solubilizing substituents at the imide moieties. This molecule, NDI-Boc, is converted to hydrogen-substituted NDI-H by heating spin-coated films. molecular orientation during thermal conversion NDI-Boc examined using two-dimensional grazing incidence X-ray diffraction (2D-GIXD)...
Abstract Multiple-angle incidence resolution spectrometry (MAIRS), originally developed in our group, is a unique spectroscopic technique for analyzing the structure of molecular aggregates thin film, which requires only refractive index film attaining an analytical accuracy three significant digits. Since MAIRS robust to surface roughness rough films prepared by using spin-coating, bar-coating, or drop-casting techniques can be analyzed with good reproducibility. makes best use Fourier...
To achieve the high charge carrier mobility of small molecular organic semiconductors, a design strategy for controlling packing structure two-dimensional (2D) [Formula: see text]-extended semiconductors in single crystal is essential. Although tetrabenzoporphyrin (BP) one promising control still challenging. improve low solubility 5,15-bis(trimethylsilylethynyl)-tetrabenzoporphyrin (TMS-BP) and polymorph 5,15-bis(triisopropylsilylethynyl)-tetrabenzoporphyrin (TIPS-BP),...
2-Alkyl-7-phenyl[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT-Cn) not only exhibits excellent performances as a p-type semiconductor for organic thin film transistors but also has great solution processability and thermal durability. This material highly ordered liquid crystalline phase of smectic E (SmE), the SmE is used precursor obtaining uniform polycrystalline film. Therefore, understanding structural formation process crucial improving device performance. In this work, transition in...
Flexible organic semiconductors are regarded as an important class of functional materials enabling their fabrication via a solution-processed method. However, supramolecularly designed thin-film transistor (OTFT) devices using hydrogen bonds have not been sufficiently developed. This is because the reduced solubility caused by introducing bond sites and difficulty in controlling molecular orientations packing structures. Herein, we report reasonable strategy for formation hydrogen-bonded...
Flexible organic semiconductors are regarded as an important class of functional materials enabling their fabrication via a solution‐processed method. However, supramolecularly designed thin‐film transistor (OTFT) devices using hydrogen bonds have not been sufficiently developed. This is because the reduced solubility caused by introducing bond sites and difficulty in controlling molecular orientations packing structures. Herein, we report reasonable strategy for formation hydrogen‐bonded...
Abstract This study reports the fabrication and performance of single‐crystal organic field‐effect transistors (SC‐OFETs) based on three 5,15‐bisaryl‐tetrabenzoporphyrin ( BP ) derivatives: C8Ph‐BP , C8Ph‐Ph‐BP Ph‐BP where C8Ph Ph are 4‐ n ‐octylphenyl phenyl groups, respectively. These compounds designed to investigate how meso ‐substituted groups affect molecular packing charge transport properties derivatives. X‐ray crystallography analysis confirms that all derivatives exhibit a...
Partially fluorinated dimyristoylphosphatidylcholines (DMPCs) involving double alkyl chains are employed to control the phonon generation in thin films, which is examined by infrared (IR) spectroscopy coupled with multiple-angle incidence resolution spectrometry (MAIRS). technique. Compounds having perfluoroalkyl (Rf) known exhibit bands IR spectra because of strong dipole-dipole interactions. Since an organic matter have a similar shape normal absorption bands, however, recognition modes...
Abstract Cutting-edge thin film studies using multiple-angle incidence resolution spectrometry (MAIRS) are introduced from the principle to forefront applications in a wide variety of research fields covering semiconductor material with respect nanoarchitectonics. MAIRS basically reveals quantitatively optical anisotropy films, which is mostly used for quantitative molecular orientation analysis each chemical group chemistry purposes. This works powerfully especially when has poor...
Infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (pMAIRS) is a useful spectroscopic tool for revealing the molecular anisotropic structure in thin film, which used orientation analysis of many functionalized organic films. pMAIRS provides both in-plane (IP) and out-of-plane (OP) vibrational mode spectra, are influenced by choice angles incidence, i.e., angle set. To obtain quantitatively reliable therefore, optimal set must be revealed. In former study, an...
Metal-oxide nanowires have demonstrated excellent capability in the electrical detection of various molecules based on their material robustness liquid and air environments. Although surface structure essentially determines interaction with adsorbed molecules, understanding correlation between an oxide nanowire molecule is still a major challenge. Herein, we propose rational methodology to obtain this information for low-density metal surfaces by employing infrared p-polarized multiple-angle...
A series of two-dimensionally expanded azulene-core-based π systems have been synthesized with different alkyl chain lengths in the alkoxy moieties connected to partially oxygen-bridged triarylamine skeletons. The thermal, photophysical, and electronic properties each compound were evaluated determine influence length on their effectiveness as hole-transporting materials (HTMs) perovskite solar cells (PSCs). All molecules showed promising material properties, including high solubility,...
Perylene dyes are a representative framework of electron transport (n-type) organic semiconductors. The energy their level is the affinity (EA), which an important parameter in selecting materials for device application and material's electron-accepting ability. Recent studies show that EA may vary by as much 1 eV depending on molecular orientation owing to electrostatic potential generated quadrupole moments. Because perylene have large moment, it essential discuss combined with sample...
The performance of an organic electronic device is significantly influenced by the anisotropic molecular structure in film, which has long been difficult to predict especially for a solution process. In present study, zinc tetraphenylporphyrin (ZnTPP) thin film prepared process was chosen comprehensively explore molecular-arrangement mechanism as function representative film-preparation parameters: solvent, technique, and thermal annealing. first analyzed using combination infrared...
Infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (pMAIRS) is a powerful tool for analyzing the molecular orientation in an organic thin film. In particular, pMAIRS works powerfully film with highly rough surface irrespective of degree crystallinity. Recently, optimal experimental condition has comprehensively been revealed, which accuracy analytical results largely improved. Regardless, some unresolved matters still remain. A structurally isotropic sample, example,...
A face-on oriented thin film of poly(3-hexylthiophene) (P3HT) is suitable for an organic semiconductor layer in a photovoltaic device, and thus analysis the structure terms molecular orientation crucial. Although often has poor crystallinity, diffraction techniques have long been employed structural analysis, only very minor crystal parts discussed. In our previous study, P3HT was revealed to uniquely even amorphous by using p-polarized multiple-angle incidence resolution spectrometry...
2-Decyl-7-phenyl[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT-C10) exhibits excellent performances as an active layer in organic thin-film transistors, and its are greatly influenced by the molecular packing, i.e., crystalline polymorphs. This compound has so-called phase a vapor-deposited film, which is different from single-crystal structure (the bulk phase). In this work, thin films of Ph-BTBT-C10 prepared spin coating, effect aging on film investigated high-resolution infrared (IR)...
The molecular structure of poly(3-alkylthiophene-2,5-diyl) in an amorphous film reveals that the short axis thiophene ring is kept highly oriented parallel to substrate, whereas long along polymer chain largely disordered. This unveiled by infrared p-polarized multiple-angle incidence resolution spectroscopy (pMAIRS), achieved analyzing orientation angles three mutually orthogonal vibrational modes localized on with aid a newly developed structural index. new analytical technique useful...
Spectral analysis using chemometrics is extensively used for quantitative chemical in a mixture, but it works powerfully only when the peak intensity solely proportional to quantity of components. In this sense, thin films on solid substrate are not suitable chemometric analysis, because molecular orientation also influences via surface selection rules. present study, long-term analytical issue has readily been overcome by p-polarized multiple-angle incidence resolution spectrometry...
Among many promising organic semiconducting materials, 2-decyl-7-phenyl[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT-C10) shows outstanding device performances for field-effect transistors. This compound has a highly ordered liquid crystalline state, i.e., the smectic E (SmE) phase. Although transition from state to SmE phase is believed accompany melting of alkyl chains, no spectroscopic evidence been found so far. In this study, conformational change decyl chains in Ph-BTBT-C10 films...