A5017435587- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organic Electronics and Photovoltaics
- Organic and Molecular Conductors Research
- Perovskite Materials and Applications
- Conducting polymers and applications
- Crystallography and molecular interactions
- Magnetism in coordination complexes
- Molecular Junctions and Nanostructures
- Nanowire Synthesis and Applications
- Advanced Memory and Neural Computing
- Thin-Film Transistor Technologies
- Nonlinear Optical Materials Research
- Solid-state spectroscopy and crystallography
- Advanced Sensor and Energy Harvesting Materials
- Semiconductor materials and interfaces
- Enzyme Structure and Function
- Semiconductor materials and devices
- Analytical Chemistry and Sensors
- Metal-Organic Frameworks: Synthesis and Applications
- Synthesis and Properties of Aromatic Compounds
- Advanced Electron Microscopy Techniques and Applications
- Organic Light-Emitting Diodes Research
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Organic Chemistry Cycloaddition Reactions
National Institute of Advanced Industrial Science and Technology
2005-2025
The University of Tokyo
2016-2019
Kashiwa Municipal Hospital
2017-2019
Tokyo Institute of Technology
2012-2019
Meguro Parasitological Museum
2015-2017
Institut des Sciences Chimiques de Rennes
2015
Centre National de la Recherche Scientifique
2015
Here, we systematically investigated the effects of thiophene-fused isomer and end-cap substitution on high-layered crystallinity, film formability, field-effect transistor characteristics in π-extended alkylated organic semiconductors (OSCs). We developed four kinds unsymmetric rod-like OSCs based syn-/anti-isomers benzothieno[6,5-b]-/benzothieno[5,6-b]-benzothieno[3,2-b]thiophene (BTBTT) with phenyl/alkyl substitutions different alkyl chain lengths: synCn antiCn (n = 6, 10). The layered...
A bio-inspired organic semiconductor 5,5′-diphenylindigo shows excellent and well-balanced ambipolar transistor properties; its hole electron mobilities are 0.56 0.95 cm2 V−1 s−1, respectively. The enhanced performance is attributed to the extended π–π overlap of phenyl groups as well characteristic packing pattern that a hybrid herringbone brickwork structures. characteristics analyzed considering operating regions, where large unipolar saturated region appears due difference threshold voltages.
On the basis of an excellent transistor material, [1]benzothieno[3,2-b][1]benzothiophene (BTBT), a series highly conductive organic metals with composition (BTBT)2XF6 (X = P, As, Sb, and Ta) are prepared structural physical properties investigated. The room-temperature conductivity amounts to 4100 S cm–1 in AsF6 salt, corresponding drift mobility 16 cm2 V–1 s–1. Owing high conductivity, this salt shows thermoelectric power factor 55–88 μW K–2 m–1, which is large value when compound regarded...
Meniscus, a curvature of droplet surface around solids, takes critical roles in solution-based thin-film processing. Extension meniscus shape, and eventual uniform film growth, is strictly limited on highly lyophobic surfaces, although such should considerably improve switching characteristics. Here, we demonstrate technique to control the solution meniscus, allowing manufacture single-crystalline organic semiconductor (OSC) films highest amorphous perfluoropolymer, Cytop. We used U-shaped...
Abstract Some rodlike organic molecules exhibit exceptionally high layered crystallinity when composed of a link between π‐conjugated backbone (head) and alkyl chain (tail). These are aligned side‐by‐side unidirectionally to form self‐organized polar monomolecular layers, providing promising 2D materials devices. However, their interlayer stacking arrangements have never been tunable, preventing the unidirectional in whole crystals. Here, it is demonstrated that polar/antipolar can be...
There is a growing demand for structure determination from small crystals, and the three-dimensional electron diffraction (3D ED) technique can be employed this purpose. However, 3D ED has certain limitations related to crystal thickness data quality. We here present application of serial X-ray crystallography (SX) with free lasers (XFELs) (a few μm or less) thin hundred nm crystals novel compounds dispersed on substrate. For XFEL exposures, two-dimensional (2D) scanning substrate coupled...
Novel mixed stack charge-transfer complexes (DMeO-BTBT)(F<sub>n</sub>-TCNQ) show air-stable n-channel transistor performance in the thin films and single crystals.
n-Channel organic transistors with excellent air stability are realized on the basis of charge-transfer complexes, (BTBT)(TCNQ), (BTBT)(F2TCNQ), (BSBS)(F2TCNQ), and (BTBT)(F4TCNQ), where BTBT is benzothieno[3,2-b]benzothiophene, BSBS benzoseleno[3,2-b]benzoselenophene, FnTCNQ (n = 0, 2, 4) fluorinated 7,7,8,8-tetracyanoquinodimethanes. These complexes consist mixed stacks essentially neutral molecules, stable even after several-month storage in ambient conditions.
Herein, we demonstrate that engineered end-cap substitution for unsymmetric extended π-cores effectively achieves well-ordered two-dimensional (2D) molecular packing and thus realizes high-performance organic semiconductors (OSCs). We developed phenyl- decyl-substituted benzothieno[6,5-b]benzothieno[3,2-b]thiophenes (BTBTTs) as solution-processable OSCs, providing layered single-crystalline thin-film transistors with a hole mobility of up to 12 cm2 V–1 s–1. The compound formed bilayer-type...
The control of two-dimensional layered crystalline and/or liquid phases for π-extended organic molecules is crucial expanding the potential electronic materials and devices. In this work, we develop unique solution-processable semiconductors based on unsymmetric substitution [1]benzothieno[3,2-b][1]benzothiophene (BTBT) with two different substituents, namely, phenylethynyl (PE) normal alkyl chain lengths n (−CnH2n+1), both which exhibit structural flexibility while maintaining rod-like...
Crystal and conformational polymorphisms play crucial roles in the physical chemical properties of materials, impacting their stability, solubility, bioavailability, which are essential for various applications pharmaceuticals, materials science, chemistry. Despite significance, structural analysis these polymorphisms, particularly remains challenging due to limited methodology that provides sufficient resolution microcrystalline variants polymorphs. Three-dimensional electron diffraction...
Band-like transport has been realized down to 20 K in solution-processed single-crystal transistors based on dioctylbenzothienobenzothiophene. The mobility increases from 16 52 cm2/V s as the temperature is lowered 300 80 K. An abrupt drop observed around K, but even below gradually increasing restored again instead of thermally activated transport. From observation a shoulder structure transfer curve, attributed discrete trap state.
The construction and control of 2D layered molecular packing motifs with functionally substituted π-electron cores are crucial for developing organic electronic materials devices. We investigated a regioisomeric structure-property relationship in high-performance solution-processable semiconductors based on mono-octyl-substituted benzothieno[3,2-b]naphtho[2,3-b]thiophene (mono-C8-BTNT). demonstrated that an isomorphous bilayer-type herringbone motif is obtainable series four positional...
A charge-transfer complex of DBPP and DMDCNQI shows air-stable ambipolar transistor characteristics.
Alkyl-substituted thiophene-2,3-dithiolate ligands are prepared through a Thio-Claisen rearrangement of 4,5-bis(propargylthio)-1,3-dithiole-2-thione derivatives. The two novel dithiolate ligands, namely, 4,5-dimethyl-thiophene-2,3-dithiolate (α-Me2tpdt) and 4-ethyl-5-methyl-thiophene-2,3-dithiolate (α-EtMetpdt), engaged in anionic Au(III) square planar complexes formulated as [Au(α-Me2tpdt)2](-) [Au(α-EtMetpdt)2](-), isolated Ph4P(+) salts. Monoelectronic oxidation gives the neutral radical...
Abstract Organic semiconductors (OSCs) often exhibit thermotropic liquid‐crystalline (LC) phases in which molecular orientational order is partially lost. The formation of a temporary LC state via solution process expected to promote printing‐based device production, although method controlling ordering over states has not yet been developed. Here, it demonstrated that long‐axis can be controlled under ambient conditions using unsymmetrically alkylated OSCs with high layered crystallinity....
The single-crystal transistor of the sulfur rich π-electron acceptor has exhibited air-stable electron mobility as high 0.22 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup>.
BTBT ([1]benzothieno[3,2-b][1]benzothiophene) is an organic semiconductor that realizes high mobility in transistors. Here we report the charge-transfer (CT) salt, (BTBT)2PF6, shows a room-temperature conductivity of 1500 S cm−1. This compound exhibits resistivity jump around 150 K, but when it covered with Apiezon N grease suppressed, and metallic maintained down to 60 K. Owing very conductivity, ESR signal significantly asymmetric Dysonian lineshape (A/B ≅ 3) even at room temperature....
Stabilization of a metallic state was successfully achieved by applying hydrogen-bonding interactions in novel benzothienobenzothiophene-based molecular conductor.
Bilayer-type layered herringbone (LHB) packing is of great importance because its remarkably high crystallinity and ability to form extremely smooth ultrathin films which are useful ...
The construction of layered molecular packing structures in a non-layered crystalline material, benzobisbenzothiophene (BBBT), was achieved by employing long-alkyl and phenyl substituents, leading to high-performance organic thin-film transistors.
Tetrathiafulvalene (TTF), pentacene, and quarterthiophene with tert-butyl substituents are synthesized, the crystal structures transistor properties investigated. The tetracyanoquinodimethane (TCNQ) complex of TTF constructs highly one-dimensional segregated columns tetragonal symmetry.