A5108664225- Organic Electronics and Photovoltaics
- Thin-Film Transistor Technologies
- Conducting polymers and applications
- Organic and Molecular Conductors Research
- Force Microscopy Techniques and Applications
- Molecular Junctions and Nanostructures
- Crystallization and Solubility Studies
- Organic Light-Emitting Diodes Research
- Magnetism in coordination complexes
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor materials and devices
- Surface and Thin Film Phenomena
- Perovskite Materials and Applications
- Food Chemistry and Fat Analysis
- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- X-ray Diffraction in Crystallography
- Magnetic and transport properties of perovskites and related materials
- Advanced Memory and Neural Computing
- Electronic and Structural Properties of Oxides
- Advanced Electron Microscopy Techniques and Applications
- Semiconductor materials and interfaces
- Chemical and Physical Properties of Materials
- Nonlinear Optical Materials Research
- Graphene research and applications
Iwate University
2015-2024
Materials Science & Engineering
2021
Morioka University
2017
Centre National de la Recherche Scientifique
2005-2008
University of Hull
2008
Aix-Marseille Université
2008
Centre Interdisciplinaire de Nanoscience de Marseille
2008
Osaka City University
2007
Osaka University
2007
Kyoto University
2007
Finding effective molecular design strategies to optimize the active layer blend morphology is among long-standing challenges in developing efficient all-polymer solar cells (all-PSCs). Here we show that new biselenophene/selenophene-linked naphthalene diimide random copolymer acceptors BSSx (x = 10, 20, 50) facilitate achievement of high-performance all-PSCs without use any solution processing additive. Blends BSS10 with donor polymer PBDB-T combined 10.1% power conversion efficiency 97%...
We report herein the development of high performance all-polymer solar cells (all-PSCs) based on a naphthalene diimide-biselenophene copolymer acceptor bearing 2-octyldodecyl side chains (PNDIBS). Inverted all-PSCs with up to 9.4% power conversion efficiency, photocurrent (18.32 mA/cm2), and remarkably low optical band-gap energy loss (0.53 eV) were achieved by blending molecular weight (Mn = 53.7 kDa) PNDIBS donor polymer PBDB-T that has complementary absorption spectrum. In contrast,...
Critical to the development of organic electronics is design and synthesis new semiconductors with improved electrical performance enhanced environmental stability. We present in this communication a series simple oligothiophene derivatives that bear styryl unit as terminal substituent. Thin film field-effect transistors incorporating these compounds show high performance, such mobilities 0.1 cm2/Vs, along exceptional stability under ambient conditions. Especially, longer oligomer, DS-4T,...
The polymorphism of pentacene thin films on SiO2 substrate was investigated by grazing incidence x-ray diffractometry (GIXD). in-plane GIXD patterns were obtained from vacuum deposited ultrathin films. By comparing the structures with thicker films, it elucidated that have same lattice constants as 100nm thick. Consistency determined interplanar d11 spacings two polymorphs suggests epitaxial growth bulk phase grows onto thin-film phase. Considering unit cell parameters, mechanism...
A systematic study of the intrinsic photostability ITIC, ITIC-Th and ITIC-4F in solution, layers blends with donor polymers is done. The temperature effect show that amorphous to crystalline transition promotes stability.
To detect the band‐specific optical signals used in many fields, it is necessary to develop spectrally selective photodetection. For such wavelength‐selective photodetection or color discrimination, organic photodetectors (OPDs) can offer significant benefits as low temperature and solution processability, chemical versatility, specific spectral detection range. However, avoid commonly filters, design of a narrowing approach that simultaneously achieves range with bandwidth less than 50 nm...
Improving carrier mobility, redox stability, blend morphology, and photovoltaic performance while elucidating structure–property relationships remains an important design goal for nonfullerene electron acceptors (NFAs) organic solar cells. Although numerous NFAs have been created from rylene diimide electron-deficient building blocks, they shown far inferior properties compared to benchmark fused-ring (FREAs) such as ITIC. Herein we show that new bis(naphthalene-imide)arylenelidenes (BNIAs),...
Careful molecular engineering has enabled solution processing of well-performing bulk-heterojunction photovoltaic layers comprising insoluble materials.
The bridging of distyryl-bithiophene leads to a kite shape the conjugated system. This twist is not like twistacenes or deformation in alpha-oligothiophenes but curvature such as bowl shaped systems. Initially perceived be undesirable, this new semiconductor OTFT devices provides excellent performances air, mu = 0.1 cm(2)/V.s, I(on)/I(off) > 10(6), S < 4 V/decade, higher by factor 5 parent unbridged coplanar analogue.
In this study, we report bulk heterojunction solar cells using hybrid nanorods as photoactive material. The core–shell are obtained via self-assembly of low band gap p-type oligomers onto ZnO nanorod surfaces. This produces highly soluble donor–acceptor nanostructures that feature a grafted semiconducting monolayer with 2.1 eV. solution processing the coaxial into thin films leads to heterojunctions particularly large interfaces. Importantly by simple donor domains smaller than typical...
The small thermal conductivity of molecular solids is beneficial for their thermoelectric applications. If Seebeck coefficients were sufficiently large to compensate the relatively electrical conductivity, these materials would be promising candidates devices. In this work, properties C60 studied by in situ measurements under ultrahigh vacuum after deposition a pure thin film. An exceptionally coefficient more than 150 mV/K was observed as steady-state thermoelectromotive force. Even...
Organic solar cells based on two benzodithiophene-based polymers (PTB7 and PTB7-Th) processed at square centimeter-size under inert atmosphere ambient air, respectively, are investigated. It is demonstrated that the performance of not limited by upscaling photoactive layer interfacial layers. Thorough morphological electrical characterizations optimized layers corresponding devices reveal losses due to area enlargement only caused sheet resistance transparent electrode reducing efficiency...
Besides providing sufficient solubility, branched alkyl chains also affect the film-forming and packing properties of organic semiconductors.
For wavelength-selective photodetection or color discrimination, organic photodetectors (OPDs) can provide significant advantages as solution processability, chemical versatility and functionality.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and transformation in polymorphism of petroselinic acid (cis-.omega.-12-octadecenoic acid)Kiyotaka. Sato, Noriyuki. Yoshimoto, Masao. Suzuki, Masamichi. Kobayashi, Fumitoshi. KanekoCite this: J. Phys. Chem. 1990, 94, 7, 3180–3185Publication Date (Print):April 5, 1990Publication History Published online1 May 2002Published inissue 5 April 1990https://pubs.acs.org/doi/10.1021/j100370a078https://doi.org/10.1021/j100370a078research-articleACS...
In situ and real-time observation of 2-dimensional grazing incidence x-ray diffraction (2D-GIXD) during growth pentacene thin films were carried out using a newly home-built portable vacuum deposition chamber synchrotron radiation at SPring-8. Crystal successive polymorphic transformation from film phase to bulk are clearly observed room temperature 75°C. A distinct orientation characterized by tilted (001) plane is found in the grown temperature.
First-principles calculations based on the density functional theory supplemented with an empirical van der Waals interaction are used to explore effect of Ag-atom intercalation electronic structure graphene Ni(111) surface. We first confirm that in most stable configuration is chemisorbed binding distance good agreement experiments. also clarify conflicting interplay symmetry breaking sublattice and hybridization \ensuremath{\pi} orbitals Ni $d$ states bandgap opening graphene. Upon Ag...
Recently, radially collapsed single-walled carbon nanotubes (SWCNTs) have been recognized as an analog of closed-edged bilayer graphene nanoribbons (GNRs). To explore this analogy, we first make detailed analyses the radial deformation and collapse armchair SWCNTs using density functional theory with van der Waals corrections. The traditional threshold diameters dividing into three regimes are obtained ${D}_{\mathrm{meta}}=2.2\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$...
Solvent vapor annealing transforms the morphology of blends by a three-stage mechanism.