Keisuke Tajima
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View article: Quantifying unit ratios in semiconducting copolymers and effect of structural deviations on photovoltaic performance
Quantifying unit ratios in semiconducting copolymers and effect of structural deviations on photovoltaic performance Open
Large batch-to-batch differences in the performance of organic photovoltaic (OPV) devices are a serious problem, often attributed to structural inconsistencies in semiconducting copolymers. This work uses X-ray photoelectron spectroscopy (…
View article: Phenothiazine-Based Solid Additives for Optimizing Film Morphologies in High-Performance Organic Photovoltaics
Phenothiazine-Based Solid Additives for Optimizing Film Morphologies in High-Performance Organic Photovoltaics Open
View article: Challenges in the Development of Novel Therapies for Thoracic Malignancies
Challenges in the Development of Novel Therapies for Thoracic Malignancies Open
This study explores the potential of targeting epigenetics and cellular senescence as novel therapeutic strategies for cancer, with a focus on thoracic malignancies. Despite significant advances in cancer treatment, including molecularly t…
View article: Steering perovskite precursor solutions for multijunction photovoltaics
Steering perovskite precursor solutions for multijunction photovoltaics Open
Multijunction photovoltaics (PVs) are gaining prominence owing to their superior capability of achieving power conversion efficiencies (PCEs) beyond the radiative limit of single-junction cells 1–8 , for which improving narrow-bandgap (NBG…
View article: Intrinsically stretchable organic photovoltaics by redistributing strain to PEDOT:PSS with enhanced stretchability and interfacial adhesion
Intrinsically stretchable organic photovoltaics by redistributing strain to PEDOT:PSS with enhanced stretchability and interfacial adhesion Open
View article: Waterproof and ultraflexible organic photovoltaics with improved interface adhesion
Waterproof and ultraflexible organic photovoltaics with improved interface adhesion Open
Ultraflexible organic photovoltaics have emerged as a potential power source for wearable electronics owing to their stretchability and lightweight nature. However, waterproofing ultraflexible organic photovoltaics without compromising mec…
View article: Orientation Control of Semiconducting Polymers in Organic Solar Cells
Orientation Control of Semiconducting Polymers in Organic Solar Cells Open
View article: Dependence of Exciton Binding Energy on Bandgap of Organic Semiconductors
Dependence of Exciton Binding Energy on Bandgap of Organic Semiconductors Open
Strongly bound excitons crucially affect the operation of organic optoelectronic devices. Nevertheless, precise experimental data on the exciton binding energy of organic semiconductors are lacking. In this study, we determine the exciton …
View article: CCDC 2216888: Experimental Crystal Structure Determination
CCDC 2216888: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2216891: Experimental Crystal Structure Determination
CCDC 2216891: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2278636: Experimental Crystal Structure Determination
CCDC 2278636: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2216892: Experimental Crystal Structure Determination
CCDC 2216892: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2216890: Experimental Crystal Structure Determination
CCDC 2216890: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2216889: Experimental Crystal Structure Determination
CCDC 2216889: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2216887: Experimental Crystal Structure Determination
CCDC 2216887: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Stabilization of Spontaneous Orientation Polarization by Preventing Charge Injection from Electrodes
Stabilization of Spontaneous Orientation Polarization by Preventing Charge Injection from Electrodes Open
The stability of the surface potential derived from spontaneous orientation polarization (SOP) in 2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) films was significantly improved by inserting an insulating layer at the…
View article: Oligo(p-phenylene vinylene) amphiphiles and methods for self-assembly
Oligo(p-phenylene vinylene) amphiphiles and methods for self-assembly Open
Amphiphilic oligo(p-phenylene vinylene) compounds and methods of use en route to self-assembled composites and device fabrication.
View article: Synthesis of 3,3′-dihydroxy-2,2′-diindan-1,1′-dione derivatives for tautomeric organic semiconductors exhibiting intramolecular double proton transfer
Synthesis of 3,3′-dihydroxy-2,2′-diindan-1,1′-dione derivatives for tautomeric organic semiconductors exhibiting intramolecular double proton transfer Open
A new synthetic route for 3,3′-dihydroxy-2,2′-diindan-1,1′-dione derivatives allows the study of the intramolecular double proton transfer in the solid state, which could elucidate possible interplay between tautomerization and charge tran…
View article: Essential Role of Triplet Diradical Character for Large Magnetoresistance in Quinoidal Organic Semiconductor with High Electron Mobility
Essential Role of Triplet Diradical Character for Large Magnetoresistance in Quinoidal Organic Semiconductor with High Electron Mobility Open
A diradicaloid molecule with high semiconducting performance is synthesized based on the quinoidal benzo[1,2‐b:4,5‐b′]dithiophene structure. The diradical character is investigated by quantum chemical calculations and variable temperature …
View article: Monitoring Ship Performance at Sea
Monitoring Ship Performance at Sea Open
View article: Ultrathin and Efficient Organic Photovoltaics with Enhanced Air Stability by Suppression of Zinc Element Diffusion
Ultrathin and Efficient Organic Photovoltaics with Enhanced Air Stability by Suppression of Zinc Element Diffusion Open
Ultrathin (thickness less than 10 µm) organic photovoltaics (OPVs) can be applied to power soft robotics and wearable electronics. In addition to high power conversion efficiency, stability under various environmental stresses is crucial f…
View article: Mechanism of charge accumulation of poly(heptazine imide) gel
Mechanism of charge accumulation of poly(heptazine imide) gel Open
Photo-stimuli response in materials is a fascinating feature with many potential applications. A photoresponsive gel of poly(heptazine imide), PHI, termed PHIG, exhibits photochromism, photoconductivity, and photo-induced charge accumulati…
View article: Photoactive layer formation in the dark for high performance of air-processable organic photovoltaics
Photoactive layer formation in the dark for high performance of air-processable organic photovoltaics Open
Recent progress in organic photovoltaics (OPVs) has led to an increased importance of laboratory-scale fabrication in ambient air using solution processes. However, the effect of the existence of both ambient air and light during the forma…
View article: Optimized Carrier Extraction at Interfaces for 23.6% Efficient Tin–Lead Perovskite Solar Cells
Optimized Carrier Extraction at Interfaces for 23.6% Efficient Tin–Lead Perovskite Solar Cells Open
Carrier extraction is a key issue which limits the efficiency of perovskite solar cells. In this work, carrier extraction is improved by modifying the perovskite layers with a combination of ethylenediammonium diiodide post-treatment and g…
View article: Highly Sensitive Evaluation of Density of States in Molecular Semiconductors by Photoelectron Yield Spectroscopy in Air
Highly Sensitive Evaluation of Density of States in Molecular Semiconductors by Photoelectron Yield Spectroscopy in Air Open
Despite the critical importance of the density of states (DOS) to the electrical properties of molecular semiconductors, there are few reliable measurement methods for the DOS, especially for the edge regions with low DOS that determine th…
View article: Mechanism of Charge Accumulation of Poly(heptazine imide) Gel
Mechanism of Charge Accumulation of Poly(heptazine imide) Gel Open
Photo-stimuli response in materials is a fascinating feature with many potential applications. A photoresponsive gel of poly(heptazine imide), PHI, termed PHIG, exhibits photochromism, photoconductivity, and photo-induced charge accumulati…
View article: Precise Control of Molecular Thin-film Surface and Its Application to Organic Solar Cells
Precise Control of Molecular Thin-film Surface and Its Application to Organic Solar Cells Open
For electronic devices with molecular semiconductors, surface of the molecular semiconductor thin-films plays a key role in the device performance. Despite its importance, the method to control the surface structure without changing bulk p…
View article: Surface Analysis of Native Spider Draglines by FE-SEM and XPS
Surface Analysis of Native Spider Draglines by FE-SEM and XPS Open
Although the physical and biological functions of the skin layer of spider dragline have been studied and partially clarified, the morphology and elemental contents of the skin layer of silk fibers have not been investigated in detail to d…
View article: Highly efficient organic photovoltaics with enhanced stability through the formation of doping-induced stable interfaces
Highly efficient organic photovoltaics with enhanced stability through the formation of doping-induced stable interfaces Open
Significance We have developed ultraflexible 3-µm-thick organic photovoltaics (OPVs) with good environmental stability and a high efficiency of over 13% by a simple postannealing process. By combining the stable polymer donor/nonfullerene …
View article: Ultraflexible Organic Photovoltaics: Nanograting Structured Ultrathin Substrate for Ultraflexible Organic Photovoltaics (Small Methods 3/2020)
Ultraflexible Organic Photovoltaics: Nanograting Structured Ultrathin Substrate for Ultraflexible Organic Photovoltaics (Small Methods 3/2020) Open
In article number 1900762 by Kenjiro Fukuda, Shinjiro Umezu, Someya Takao, and co-workers, the fabrication of ultraflexible organic photovoltaics on nanostructured substrates is reported. The organic photovoltaics have a high power convers…