Search

Your search keyword '"Tachibana, Hiroaki"' showing total 234 results
Start Over Author "Tachibana, Hiroaki"
234 results on '"Tachibana, Hiroaki"'

2. Reactivity Manipulation of Ionic Liquid Based on Alkyl Primary Ammonium: Protonation Control Using 4‐tert‐Butylpyridine Additive for Effective Spontaneous Passivation of Perovskite via Hole Transport Material Deposition.

Author

Nishimura, Naoyuki, Tachibana, Hiroaki, Katoh, Ryuzi, Kanda, Hiroyuki, and Murakami, Takurou N.

Subjects
MATERIALS science, SOLAR cells, DESIGN exhibitions, POTENTIAL functions, PYRIDINE derivatives
Abstract

Alkyl‐primary‐ammonium‐based room‐temperature ionic liquids (RTILs) designed to exhibit specific reactivities allowing functions that cannot be achieved by other RTILs have recently emerged. The archetype of the reactive RTILs is n‐octylammonium bis(trifluoromethanesulfonyl)imide (OA‐TFSI), which has promising functions as an additive for hole transport materials (HTMs) in perovskite solar cells (PSCs); the high reactivity of the OA cations on the perovskite surface allows spontaneous perovskite passivation via HTM deposition, effectively improving the photovoltaic (PV) performance. However, although the reactivity manipulation of the reactive RTILs is instrumental for exploiting their potential functions and exploring their application scope, methods for reactivity control have not been developed. Herein, it is proposed that the coaddition of a pyridine derivative (4‐tert‐butylpridine: TBP) can effectively manipulate the reactivity of OA‐TFSI by controlling the protonation between OA and the 2,2′,7,7′‐tetrakis‐(N,N‐di‐4‐methoxyphenylamino)‐9,9′‐spirobifluorene (Spiro‐OMeTAD) HTM. The TBP prevents OA deprotonation presumably via stabilization of the OA cation, thus retaining its ammonium form, which allows efficient spontaneous perovskite passivation, effectively enhancing the PV performance. This reveals the protonation preference in the OA‐TFSI system, which is opposite to that in conventional RTILs. This first proposal of a method in manipulating reactivity of the reactive RTILs will contribute to the development of materials science. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

6. Enhancing NIR-to-visible photon upconversion in cast solid by introducing bulky substituents in rubrene and by suppressing back energy transfer

Author

Sawa, Akane, primary, Shimada, Shota, additional, Tripathi, Neeti, additional, Heck, Claire, additional, Tachibana, Hiroaki, additional, Koyama, Emiko, additional, Mizokuro, Toshiko, additional, Hirao, Yasukazu, additional, Kubo, Takashi, additional, Tamai, N., additional, Kuzuhara, Daiki, additional, Yamada, Hiroko, additional, and Kamada, Kenji, additional

Published
2023
Full Text
View/download PDF

11. Effect of heat treatment on Langmuir-Blodgett films of a C60 adduct

Author

Tachibana, Hiroaki, Azumi, Reiko, Ouchi, Akihiko, and Matsumoto, Mutsuyoshi

Subjects
Dissociation -- Analysis, Carbon -- Thermal properties, Thin films, Multilayered -- Usage, Chemicals, plastics and rubber industries
Abstract

The Langmuir-Blodgett (LB) films of C60 are designed via a thermal dissociation method. The effect of heat treatments of the LB films is investigated by using UV-visible and infrared absorption spectroscopies.

Published
2001

14. Reversible light-induced morphological change in Langmuir-Blodgett films

Author

Matsumoto, Mutsuyoshi, Miyazaki, Daisuke, Tanaka, Motoo, Azumi, Reiko, Manda, Eiichiro, Kondo, Yukishige, Yoshino, Norio, and Tachibana, Hiroaki

Subjects
Thin films, Multilayered -- Research, Isomerization -- Research, Chemistry
Abstract

A reversible morphological transformation of the Langmuir-Blodgett (LB) films of AZ-/PDAA+ on alternate illumination with UV and visible light was observed. This was possibly due to the conformational transformation caused by photoisomerization, followed by thermal relaxation processes. Photoisomerization in LB films leads to substantial changes in the two-dimensional structures in response to the stress imposed by a rise in area per molecule caused by trans-to-cis photoisomerization of azobenzene.

Published
1998

15. Unimolecular electrical rectification in hexadecylquinolinium tricyanoquinodimethanide

Author

Metzger, Robert M., Chen, Bo, Hopfner, Ulf, Lakshmikantham, M.V., Vuillaume, Dominique, Kawai, Tsuyoshi, Wu, Xiangli, Tachibana, Hiroaki, Hughes, Terry V., Sakurai, Hiromi, Baldwin, Jeffrey W., Hosch, Christina, Cava, Michael P., Brehmer, Ludwig, and Ashwell, Geoffrey J.

Subjects
Thin films, Multilayered -- Research, Electrical conductivity -- Analysis, Chemistry
Abstract

Macroscopic and nanoscopic current-voltage measurements indicated asymmetries in the DC electrical conductivity through Langmuir-Blodgett multilayers and even monolayers of gamma-(n-hexadecyl)quinolium tricyanoquinodeimethanide, C16H33Q-3CNQ (5). These assymetries are caused by a transition of the ground-state zwitterion to an excited-state conformer which is probably neutral. Unimolecular electrical rectification by monolayers of 5 was definitely ascertained.

Published
1997

Catalog

Books, media, physical & digital resources
See catalog results