Search results for: Hiroshi Segawa

Items from 1 to 20 out of 61 results

article

Perovskite Solar Cells Consisting of PTAA Modified with Monomolecular Layer and Application to All‐Perovskite Tandem Solar Cells with Efficiency over 25%

Huan Bi, Yasuhiro Fujiwara, Gaurav Kapil, Daiva Tavgeniene, more

Advanced Functional Materials > 33 > 32 > n/a - n/a

This study is on the enhancement of the efficiency of wide bandgap (FA_0.8Cs_0.2PbI_1.8Br_1.2) perovskite solar cells (PSCs) used as the top layer of the perovskite/perovskite tandem solar cell. Poly[bis(4‐phenyl) (2,4,6‐trimethylphenyl) amine] (PTAA) and the monomolecular layer called SAM layer are effective hole collection layers for APbI₃ PSCs. However, these hole transport layers (HTL) do not give...

article

Graphene‐Like Conjugated Molecule as Hole‐Selective Contact for Operationally Stable Inverted Perovskite Solar Cells and Modules

Tianhao Wu, Xiushang Xu, Luis K. Ono, Ting Guo, more

Advanced Materials > 35 > 21 > n/a - n/a

Further enhancing the operational lifetime of inverted‐structure perovskite solar cells (PSCs) is crucial for their commercialization, and the design of hole‐selective contacts at the illumination side plays a key role in operational stability. In this work, the self‐anchoring benzo[rst]pentaphene (SA‐BPP) is developed as a new type of hole‐selective contact toward long‐term operationally stable inverted...

article

Photosensitized Protein Damage by DiethyleneglycoxyP(V)tetrakis(p‐n‐butoxyphenyl)porphyrin Through Electron Transfer: Activity Control Through Self‐aggregation and Dissociation

Kazutaka Hirakawa, Mami Yoshida, Toru Hirano, Jotaro Nakazaki, more

Photochemistry and Photobiology > 98 > 2 > 434 - 441

DiethyleneglycoxyP(V)tetrakis(p‐n‐butoxyphenyl)porphyrin (EGP(V)TBPP) forms a self‐aggregation in an aqueous solution, and the photoexcited state of this molecule was effectively deactivated. Association with human serum albumin (HSA), a water‐soluble protein, causes dissociation of the self‐aggregation, resulting in recovery of the photosensitizer activity of EGP(V)TBPP. Under visible light irradiation,...

article

Interface Energy‐Level Management toward Efficient Tin Perovskite Solar Cells with Hole‐Transport‐Layer‐Free Structure

Xiao Liu, Tianhao Wu, Caiyi Zhang, Yiqiang Zhang, more

Advanced Functional Materials > 31 > 50 > n/a - n/a

Lead‐free tin perovskite solar cells (PSCs) have emerged as a promising candidate toward high‐performance and eco‐friendly photovoltaic technology with great potential for future application. However, tin PSCs with over 10% efficiency usually feature an organic hole transport layer (HTL) at the illumination side that may induce device degradation during long‐term operation. Removing the unstable organic...

article

Making Room for Growing Oriented FASnI₃ with Large Grains via Cold Precursor Solution

Danyu Cui, Xiao Liu, Tianhao Wu, Xuesong Lin, more

Advanced Functional Materials > 31 > 25 > n/a - n/a

Tin halide perovskites are promising candidates for preparing efficient lead‐free perovskite solar cells due to their ideal band gap and high charge‐carrier mobility. However, the notorious rapid crystallization process results in the inferior power conversion efficiency (PCE) of tin perovskite solar cells (TPSCs). Here, a facile method is employed to manage this crystallization process by using cold...

article

Real‐Time In Situ Observation of Microstructural Change in Organometal Halide Perovskite Induced by Thermal Degradation

Tae Woong Kim, Naoyuki Shibayama, Ludmila Cojocaru, Satoshi Uchida, more

Advanced Functional Materials > 28 > 42 > n/a - n/a

Organometal halide perovskites have demonstrated remarkable achievements in solar cell applications and have attracted tremendous attention as next‐generation photovoltaic materials. Regardless of the unprecedented success, the degradation of the perovskite has caused the performance of the perovskite solar cells to be unreliable and prevented their commercialization. However, the detailed degradation...

article

Solar Cells: Self‐Organized Superlattice and Phase Coexistence inside Thin Film Organometal Halide Perovskite (Adv. Mater. 8/2018)

Tae Woong Kim, Satoshi Uchida, Tomonori Matsushita, Ludmila Cojocaru, more

Advanced Materials > 30 > 8 > n/a - n/a

Atomic configurations of superlattices of an organometal halide perovskite layer composed of a mixture of tetragonal and cubic phases are reported by Tae Woong Kim, Satoshi Uchida, Hiroshi Segawa, and co‐workers in article number 1705230. The tetragonal and cubic phases are found to coexist at room temperature, and superlattices composed of a mixture of tetragonal and cubic phases are found to be...

article

Self‐Organized Superlattice and Phase Coexistence inside Thin Film Organometal Halide Perovskite

Tae Woong Kim, Satoshi Uchida, Tomonori Matsushita, Ludmila Cojocaru, more

Advanced Materials > 30 > 8 > n/a - n/a

Organometal halide perovskites have attracted widespread attention as the most favorable prospective material for photovoltaic technology because of their high photoinduced charge separation and carrier transport performance. However, the microstructural aspects within the organometal halide perovskite are still unknown, even though it belongs to a crystal system. Here direct observation of the microstructure...

article

Regioregular Phthalocyanines Substituted with Bulky Donors at Non‐Peripheral Positions

Satoshi Yamamoto, Kengo Kuribayashi, Takuro N. Murakami, Eunsang Kwon, more

Chemistry – A European Journal > 23 > 61 > 15446 - 15454

Three regioregular phthalocyanines (1–3) were synthesized selectively by the cyclic tetramerization of phthalonitriles bearing a bulky diarylamine substituent at the next position of nitrile. The steric repulsion at the tetramerization of bulky phthalonitriles allowed for the selective formation of regioregular phthalocyanines as confirmed by NMR and single crystal X‐ray structural analyses. The absorption...

article

All-inorganic inverse perovskite solar cells using zinc oxide nanocolloids on spin coated perovskite layer

Naoyuki Shibayama, Hiroyuki Kanda, Shin-ichi Yusa, Shota Fukumoto, more

Nano Convergence > 2017 > 4 > 1 > 1-5

We confirmed the influence of ZnO nanoparticle size and residual water on performance of all inorganic perovskite solar cells. By decreasing the size of the ZnO nanoparticles, the short-circuit current density (Jsc) and open circuit photovoltage (Voc) values are increased and the conversion efficiency is improved. Although the Voc value is not affected by the influence of residual water in the solution...

article

Multi-step intramolecular excitation energy transfer in dendritic pyrene-phosphorus(V)porphyrin heptads

Kazutaka Hirakawa, Hiroshi Segawa

Journal of Luminescence > 2016 > 179 > C > 457-462

Dendritic heptad molecules in which four pyrenyl groups are connected at the central phosphorus atom of the edge-porphyrins of the center-to-edge type porphyrin trimers were synthesized to investigate a multi-step excitation energy transfer. As the central energy acceptor, two types porphyrins which one was phosphorus(V)tetraphenylporphyrin (H2) and another was its derivative substituted by butoxy...

chapter

Fully printable mesoscopic perovskite solar cells; effect of NiO layer on the device performance

Nirmal Peilis, Gai Mizuta, Hiroyuki Kanda, Tomoya Nishina, more

2016 23rd International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) > 249 - 230

2016 23rd International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD)

Developing low-cost hole transporting materials or hole-conductor free mesoscopic Perovskite solar cells (PSCs) by replacing the noble metal-based counter electrodes with inexpensive and abundantly available materials is a great interest in Photovoltaic industry. Herein, we fabricated fully printable low-cost mesoscopic PSCs with carbon counter electrode using mesoporous TiO₂ and NiO layers as electron...

article

Impedance spectroscopic analysis of high-performance dye sensitized solar cells based on nano-clay electrolytes

Victoria González Pedro, Hideki Sakurai, Mitsuru Tomita, Bruno Ieiri Ito, more

Electrochimica Acta > 2016 > 197 > C > 77-83

In this work we present quasi-solid state dye-sensitized solar cells obtained employing artificial hydrotalcite nano-clay as electrolyte additive, with a greatly improved photo-energy conversion efficiency of up to 10.9% with respect to the 9.6% obtained for liquid electrolyte ruthenium based reference cell. Through impedance spectroscopy, we have evaluated quantitatively the effects of shifts in...

article

Effect of inclination on oscillation characteristics of an oscillating water column wave energy converter

Mitsumasa Iino, Takeaki Miyazaki, Hiroshi Segawa, Makoto Iida

Ocean Engineering > 2016 > 116 > C > 226-235

Oscillating water column (OWC) wave energy converters are adopted in many marine applications such as buoys. This research investigates how inclination-induced changes in motion affect the oscillation characteristics of an OWC. As the collector of the OWC wave energy converter is inclined, the direction of motion of the water column is also inclined because it is constrained by collector walls. To...

article

Theoretical Evaluation of Electron Transport in Aniline Tetramer-based Dye-sensitized Solar Cells

Shozo Yanagida, Kazuhiro Manseki, Hiroshi Segawa

Electrochimica Acta > 2015 > 179 > C > 169-173

The essential electron transporting function of EPAT in phenyl-capped aniline tetramer (EPAT)/tert-butylpyridine (TBP)-based dye-sensitized solar cells (DSC) is evaluated by density functional theory (DFT). DFT-based molecular modeling coupled with molecular mechanics optimization reveal that EPAT molecules in-situ self-organizes to dimeric molecular complexes through van der Waals and Coulombic interactions...

article

Investigation of plasmonic gold–silica core–shell nanoparticle stability in dye-sensitized solar cell applications

Björn Törngren, Kenta Akitsu, Anne Ylinen, Simon Sandén, more

Journal of Colloid And Interface Science > 2014 > 427 > Complete > 54-61

Plasmonic core–shell Au@SiO ₂ nanoparticles have previously been shown to enhance the performance of dye-sensitized solar cells (DSSCs). A thin silica coating can provide a better stability during thermal processing and chemical stability to survive the corrosive electrolyte used in DSSCs. However, the thickness and completeness of the silica shell has proven crucial for the performance of...

article

Identification of possible downstream genes required for the extension of peripheral axons in primary sensory neurons

Makoto Aoki, Hiroshi Segawa, Mayumi Naito, Hitoshi Okamoto

Biochemical and Biophysical Research Communications > 2014 > 445 > 2 > 357-362

The LIM-homeodomain transcription factor Islet2a establishes neuronal identity in the developing nervous system. Our previous study showed that Islet2a function is crucial for extending peripheral axons of sensory neurons in zebrafish embryo. Overexpressing a dominant-negative form of Islet2a significantly reduced peripheral axon extension in zebrafish sensory neurons, implicating Islet2a in the gene...

article

Charge transport studies on novel PT-derivatives with hydrophilic anchoring groups

Mathias Nyman, Kenta Akitsu, Naoki Otani, Mitsunobu Matsumura, more

Synthetic Metals > 2013 > 164 > C > 60-63

Using charge extraction techniques we have clarified the charge transport properties of novel polythiophene derivatives intended for use as sensitizers in polymer sensitized solar cells. The polymers are of low molecular weight in order to enable penetration into a mesoporous titanium dioxide film. Hydrophilic anchoring units are attached to the thiophene ring to facilitate attachment of the polymer...

article

Computational dye design by changing the conjugation order: Failure of LR-TDDFT to predict relative excitation energies in organic dyes differing by the position of the methine unit

Sergei Manzhos, Hiroshi Segawa, Koichi Yamashita

Chemical Physics Letters > 2012 > 527 > Complete > 51-56

In dye design by changing the conjugation order, computational errors behave differently and are more important than when changing the size of conjugation. A different position of the methine unit in dyes 2-Cyano-3-[5′-(4″-(N,N-dimethylamino) phenyl) thiophen-2′-yl]-acrylic acid and Cyano-[5-(4′-(N,N-dimethylamino) benzylidene)-5H-thiophen-2-ylidene]-acetic acid induces an uncommonly large difference...

article

Study of Interfacial Charge Transfer Bands and Electron Recombination in the Surface Complexes of TCNE, TCNQ, and TCNAQ with TiO ₂

Sergei Manzhos, Ryota Jono, Koichi Yamashita, Jun-ichi Fujisawa, more

The Journal of Physical Chemistry C > 2011 > 115 > 43 > 21487 - 21493

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INFONA - science communication portal

Search results for: Hiroshi Segawa

Perovskite Solar Cells Consisting of PTAA Modified with Monomolecular Layer and Application to All‐Perovskite Tandem Solar Cells with Efficiency over 25%

Graphene‐Like Conjugated Molecule as Hole‐Selective Contact for Operationally Stable Inverted Perovskite Solar Cells and Modules

Photosensitized Protein Damage by DiethyleneglycoxyP(V)tetrakis(p‐n‐butoxyphenyl)porphyrin Through Electron Transfer: Activity Control Through Self‐aggregation and Dissociation

Interface Energy‐Level Management toward Efficient Tin Perovskite Solar Cells with Hole‐Transport‐Layer‐Free Structure

Making Room for Growing Oriented FASnI₃ with Large Grains via Cold Precursor Solution

Real‐Time In Situ Observation of Microstructural Change in Organometal Halide Perovskite Induced by Thermal Degradation

Solar Cells: Self‐Organized Superlattice and Phase Coexistence inside Thin Film Organometal Halide Perovskite (Adv. Mater. 8/2018)

Self‐Organized Superlattice and Phase Coexistence inside Thin Film Organometal Halide Perovskite

Regioregular Phthalocyanines Substituted with Bulky Donors at Non‐Peripheral Positions

All-inorganic inverse perovskite solar cells using zinc oxide nanocolloids on spin coated perovskite layer

Multi-step intramolecular excitation energy transfer in dendritic pyrene-phosphorus(V)porphyrin heptads

Fully printable mesoscopic perovskite solar cells; effect of NiO layer on the device performance

Impedance spectroscopic analysis of high-performance dye sensitized solar cells based on nano-clay electrolytes

Effect of inclination on oscillation characteristics of an oscillating water column wave energy converter

Theoretical Evaluation of Electron Transport in Aniline Tetramer-based Dye-sensitized Solar Cells

Investigation of plasmonic gold–silica core–shell nanoparticle stability in dye-sensitized solar cell applications

Identification of possible downstream genes required for the extension of peripheral axons in primary sensory neurons

Charge transport studies on novel PT-derivatives with hydrophilic anchoring groups

Computational dye design by changing the conjugation order: Failure of LR-TDDFT to predict relative excitation energies in organic dyes differing by the position of the methine unit

Study of Interfacial Charge Transfer Bands and Electron Recombination in the Surface Complexes of TCNE, TCNQ, and TCNAQ with TiO ₂

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