A5101398803- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Soil and Unsaturated Flow
- Semiconductor materials and interfaces
- Synthesis and properties of polymers
- Surfactants and Colloidal Systems
- Groundwater flow and contamination studies
- Silicon and Solar Cell Technologies
- Advanced Sensor and Energy Harvesting Materials
- Molecular Junctions and Nanostructures
- Landslides and related hazards
- Geotechnical Engineering and Soil Stabilization
- Organic and Molecular Conductors Research
- Chemical and Physical Properties in Aqueous Solutions
- Thin-Film Transistor Technologies
- Analytical Chemistry and Sensors
- Dam Engineering and Safety
- Crystallization and Solubility Studies
- Urinary Bladder and Prostate Research
- Analytical Chemistry and Chromatography
- X-ray Diffraction in Crystallography
- solar cell performance optimization
- Organic Light-Emitting Diodes Research
- Organic Chemistry Cycloaddition Reactions
Hiroshima University
2014-2024
Kyoto University
2024
Kobe University
2007-2024
RIKEN Center for Emergent Matter Science
2015-2017
Graduate School USA
2014-2017
RIKEN
2016
Japan Society of Civil Engineers
2001
Yamaguchi University
1975-1998
Nagoya University
1988-1998
Chubu Rosai Hospital
1998
The backbone orientation in the thiophene-thiazolothiazole (TzTz) copolymer system can be altered by tuning of alky side chain composition. We highlight that significantly impact their solar cell efficiency particular when using thicker active layers.
Abstract Ultraflexible optical devices have been used extensively in next-generation wearable electronics owing to their excellent conformability human skins. Long-term health monitoring also requires the integration of ultraflexible with an energy-harvesting power source; make self-powered. However, system-level sensors sources is challenging because insufficient air operational stability polymer light-emitting diodes. Here we develop self-powered organic system for photoplethysmogram by...
A thiazolothiazole–thiophene copolymer is examined as the active material in bulk heterojunction (BHJ) solar cells. By optimizing molecular weight, polymer-based cells exhibit power conversion efficiencies high 5.7%. The increase weight improves orientational order, and blending with phenyl-C61-butyric acid methyl ester (PC61BM) changes motif from edge-on to face-on, which accounts for trend photovoltaic performances. These results might give new insight into structure–property relationships...
The introduction of quinoidal character to π-conjugated polymers is one the effective approaches reducing bandgap. Here we synthesized new (PBTD4T and PBDTD4T) incorporating thienoquinoids 2,2'-bithiophene-5,5'-dione (BTD) benzo[1,2-b:4,5-b']dithiophene-2,6-dione (BDTD) as strong electron-deficient (acceptor) units. PBTD4T showed a deep LUMO energy level -3.77 eV small bandgap 1.28 eV, which are similar those analog using thieno[3,2-b]thiophene-2,5-dione (TTD) (PTTD4T). PBDTD4T had much...
A novel electron-deficient building unit, dithienylthienothiophenebisimide, and its polymers (PTBIs) are reported. Organic photovoltaic (OPV) cells based on PTBIs as p-type material exhibit 8.0% efficiencies with open-circuit voltages higher than 1 V. Interestingly, also function n-type in OPVs depending the molecular structure. These p-channel, n-channel, ambipolar behaviors field-effect transistors. As a service to our authors readers, this journal provides supporting information supplied...
Journal Article Age-Related Changes of Sympathetic Outflow to Muscles in Humans Get access Satoshi Iwase, Iwase 1The Research Institute Environmental Medicine, Nagoya UniversityJapan Search for other works by this author on: Oxford Academic PubMed Google Scholar Tadaaki Mano, Mano Takemasa Watanabe, Watanabe 2Department Hygiene, Aichi Medical College, NagakuteJapan Mitsuru Saito, Saito Fumio Kobayashi Gerontology, Volume 46, Issue 1, January 1991, Pages M1–M5,...
Abstract Mechanically durable transparent electrodes are needed in flexible optoelectronic devices to realize their long‐term stable functioning, for applications various fields such as energy, healthcare, and soft robotics. Several promising based on nanomaterials have been previously reported replace the conventional fragile indium‐tin oxide (ITO); however, obtaining feasible printed ultraflexible with a multistack structure is still great challenge. Here, ultrathin (uniform thickness of...
Abstract Ultralightweight and flexible power sources are essential for driving textile or wearable electronic devices soft robots because they do not induce discomfort limit movement when attached to human skin, textiles, actuators. Organic solar cells (OSCs) good candidates developing such have the advantages of being lightweight flexible. However, achieving operational stability ultrathin shape simultaneously remains difficult substrate cannot prevent penetration ultraviolet (UV) light,...
Abstract Controlling the energetics and backbone order of semiconducting polymers is essential for performance improvement polymer‐based solar cells. The use fluorine as substituent known to effectively deepen molecular orbital energy levels coplanarize by noncovalent interactions with sulfur thiophene ring. In this work, novel are designed synthesized based on difluoronaphthobisthiadiazole (FNTz) a new family naphthobisthiadiazole (NTz)–quaterthiophene copolymer systems, which one highest...
Abstract A critical issue in polymer-based solar cells (PSCs) is to improve the power conversion efficiency (PCE) as well stability. Here, we describe development of new semiconducting polymers consisting thiophene, thiazolothiazole and naphthobisthiadiazole polymer backbone. The had good solubility thus solution-processability, appropriate electronic structure with narrow band gaps ~1.57 eV low-lying HOMO energy levels ~−5.40 highly ordered favorable face-on backbone orientation. Solar...
In this review, we summarize recent progress in the development of π-conjugated polymers and molecules for organic photovoltaics that enable small photon energy loss high power conversion efficiency at same time.
Careful control of electronic properties, structural order, and solubility π-conjugated polymers is central to the improvement organic photovoltaic (OPV) performance. In this work, we designed synthesized a series naphthobisthiadiazole-quaterthiophene copolymers by systematically replacing alkyl groups with ester changing position fluorine in quaterthiophene moiety. These alterations lowered HOMO LUMO energy levels varied combination intramolecular noncovalent interactions such as O⋯S F⋯S...
Abstract Flexible and stretchable organic photovoltaics (OPVs) are promising as a power source for wearable devices with multifunctions ranging from sensing to locomotion. Achieving mechanical robustness high conversion efficiency ultraflexible OPVs is essential their successful application. However, it challenging simultaneously achieve these features by the difficulty maintain stable performance under microscale bending radius. Ultraflexible proposed employing novel metal‐oxide‐free...
Abstract Ternary polymer solar cells based on a thiazolothiazole-based donor (PTzBT) and fullerene acceptor (PC 61 BM) have attracted attention because they show high efficiency stability by addition of non-fullerene (ITIC). However, the performance improvement mechanism is not completely elucidated. Here, we due to less charge accumulation in PTzBT with ITIC using operando electron spin resonance from microscopic viewpoint. We observed two correlations between device number spins ( N )...
Abstract Detrusor dysfunction is one of the most common problems in patients with outflow obstruction secondary to benign prostatic hyperplasia. These complain various symptoms, including urinary frequency, urge incontinence, difficulty voiding, and retention. The severity symptoms dependent on stage disease and/or obstruction. We compared changes rat detrusor function following both mild severe models partial outlet rat. Outflow obstructions were created by ligation urethra over which a...
Although the charge separation (CS) and transport processes that compete with geminate non-geminate recombination are commonly regarded as governing factors of organic photovoltaic (OPV) efficiency, details CS mechanism remain largely unexplored. Here we provide a systematic investigation on role local carrier mobility in bulk heterojunction films ten different low-bandgap polymers polythiophene analogues blended methanofullerene (PCBM). By correlating OPV performances, demonstrated blend...
While palladium-catalyzed direct arylation polymerization (DArP) is an easy and safe method to synthesize semiconducting polymers with alternating donor–acceptor units (DA polymers), branching cross-linking defects arising from unintended side reactions are common. When these used as electronic materials in organic solar cells (OSCs) similar devices, may adversely affect device performance. We have recently shown that the can be inhibited by simultaneous presence of two ligands,...
Abstract Crystallinity of π‐conjugated polymer donors as well acceptors is a crucial factor for boosting the performance organic photovoltaic (OPV) cells. However, in state‐of‐the‐art OPVs based on nonfullerene (NFAs), polymers with low crystallinity are typically used and provide high efficiencies. Here, polymers, named PTzBT PTzBTE thiazolothiazole (TzTz), having similar but different aggregation properties blended number acceptor materials such PC 71 BM, IT‐4F, Y6, Y12 property....
Thiazole, as a family of five-membered heteroaromatic rings, is an interesting building unit that can play role in coplanarizing the backbone well deepening HOMO energy level, which beneficial for design π-conjugated polymers photoactive materials organic photovoltaics (OPVs). Here, we designed and synthesized with simple chemical structures, consist 2,2′-bithiazole or 5,5′-bithiazole alkylthiophenes polymer backbone. In fact, be easily much fewer steps compared to typical high-performance...
Abstract Understanding photon energy loss caused by the charge recombination in ternary blend polymer solar cells based on nonfullerene acceptors (NFAs) is crucial for achieving further improvements their device performance. In such a system, however, two types of donor/acceptor interface coexist, making it more difficult to analyze loss. Here, we have focused origin voltage behind high open‐circuit ( V OC ) devices one donor (poly(2,5‐bis(3‐(2‐butyloctyl)thiophen‐2‐yl)‐thiazolo[5,4‐ d...
Organic photovoltaics (OPVs) have attracted considerable attention due to their potential for generating renewable energy. The power conversion efficiency (PCE) of the OPVs largely depends on organic semiconducting materials. Thus, elucidation structure–property OPV performance relationships is important rational improvement OPVs. Here, low-bandgap copolymers comprising dithieno[3,2-b:2′,3′-d]silole as a donor unit and dialkyl-substituted naphtho[2,3-c]thiophene-4,9-dione an acceptor were...
N-type (electron-transporting) semiconducting polymers are essential materials for the development of truly plastic electronic devices. Here, we synthesized first time dithiazolylthienothiophene bisimide (TzBI), as a new family imide-based electron-deficient π-conjugated systems, and by incorporating TzBI into backbone building unit. The TzBI-based found to have deep frontier molecular orbital energy levels wide optical bandgaps compared dithienylthienothiophene (TBI) counterpart. It is also...