Article
Chemistry, Physical
Sultan A. Al-horaibi, Abdel-Basit Al-Odayni, Abdulmajeed Alezzy, Mohammed ALSaeedy, Arwa Al-Adhreai, Waseem Sharf Saeed, Ahmed Hasan
Summary: The synthesis of SQI-5 and SQI-6 dyes with -SO3H and -COOH functional groups provides a promising avenue to enhance the efficiency of dye-sensitized solar cells (DSSCs) in the near-infrared (NIR) region. These newly developed dyes exhibit exceptional solubility in various organic solvents. The SQI-6 dye, featuring -COOH anchoring group, demonstrates the best photovoltaic performance among the investigated sensitizers.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Physical
Yuzhong Chen, Ruijie Ma, Tao Liu, Yiqun Xiao, Ha Kyung Kim, Jianquan Zhang, Chao Ma, Huiliang Sun, Fujin Bai, Xugang Guo, Kam Sing Wong, Xinhui Lu, He Yan
Summary: Chemical modifications of non-fullerene acceptors have been shown to improve the efficiency of organic solar cells. By introducing chlorination and inner side-chain engineering, a higher power conversion efficiency was achieved. Furthermore, the impact of asymmetric alkoxy substitution on the outer side chains was studied, highlighting the importance of achieving a balance between open-circuit voltage and short-circuit current density.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Sultan A. Al-horaibi, Abdel-Basit. Al-Odayni, Abdulmajeed. Alezzy, Mohammed. ALSaeedy, Waseem. Saeed, Ahmed Hasan, Reda M. El-Shishtawy
Summary: This study synthesized two novel squaraine dyes SQI-P and SQI-H and employed them as near-infrared (NIR) sensitizers in dye-sensitized solar cells (DSSC). The experimental results showed that the SQI-P/SQI-H sensitizer exhibited strong absorption in the NIR region, improved electron injection efficiency, and excellent photostability. By optimizing the co-sensitized DSSC, the combination of the NIR-absorbing squaraine-based indoline with SQI-P achieved a high photocurrent output of 22.3 mA/cm2 at an efficiency of 4.8%, representing a breakthrough for DSSCs in the NIR region.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Physical
Arthur Turkin, Pavel Maly, Christoph Lambert
Summary: The influence of oligosquaraine chain length on the energies and shape of absorption and emission bands, as well as the exciton coherence length, was studied in CHCl3 with a random coil structure. The coherence length is much smaller than the geometrical length due to reduced electronic delocalisation from structural disorder. Absorption and emission spectra characteristics are affected by both energetic and structural disorder, with excitonic splitting and disorder broadening absorption bands while exciton delocalisation narrows emission bands.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Kewei Hu, Hang Yang, Haoyu Cao, Hongyu Fan, Xiaoxiao Li, Chaohua Cui, Yongfang Li
Summary: In this study, a flexible side-chains engineering strategy was applied to enhance the physicochemical properties of NTDO-based polymer donors. By replacing the 2-ethylhexyl chain with 2-butyloctyl chains, the resulting polymer PBN-SBO showed improved solubility, reduced crystallinity, and better miscibility with the acceptor material Y6. The PBN-SBO:Y6 blend exhibited enhanced morphology, enabling better charge carrier transport and less charge recombination, leading to a significantly improved power-conversion efficiency of 16.22% compared to the PBN-S:Y6-based device with a PCE of 12.86%. This work highlights the crucial role of side-chain engineering in manipulating the physicochemical properties for improved photovoltaic performance and the potential of NTDO unit in designing high-performance polymer donor materials for PSCs.
ORGANIC ELECTRONICS
(2023)
Article
Chemistry, Applied
Yingying Xu, Xizhe Chu, Jiangting He, Leiquan Huang, Liying Dong, Huayu Qiu, Zhigang Ni, Miaomiao Li, Qian Zhang
Summary: Side chain isomerization significantly affects the intermolecular interaction and aggregation morphology of organic small molecule acceptors. In this study, two isomeric nonfused ring electron acceptors (NFREAs) were designed and synthesized with different pending positions of alkylthio side chains. The influence of pending positions on photophysical and photovoltaic properties were investigated. It was found that the specific pending position led to different absorption, molecular packing, and aggregation behavior, which ultimately affected the power conversion efficiency of the devices.
Article
Chemistry, Physical
Jianquan Zhang, Fujin Bai, Indunil Angunawela, Xiaoyun Xu, Siwei Luo, Chao Li, Gaoda Chai, Han Yu, Yuzhong Chen, Huawei Hu, Zaifei Ma, Harald Ade, He Yan
Summary: Side-chain modifications of NFAs play a crucial role in enhancing the performance of OSCs. By introducing bulkier alkyl chains branched at specific positions, it is possible to alter molecular packing, improve open-circuit voltage, and achieve better device performance. The side-chain branching design of NFAs shows great potential in optimizing molecular properties and promoting photovoltaic performance.
ADVANCED ENERGY MATERIALS
(2021)
Article
Polymer Science
Katharina Breul, Sebastian Seiffert
Summary: The rational design of transiently crosslinked polymer gels requires a deep understanding of how molecular and topological factors affect material properties, with distinct differences observed between random PUs and alternating PUs.
Article
Chemistry, Applied
Yuheng Man, Linglong Ye, Yunhao Cai, Xiaobo Sun, Yanming Sun
Summary: Side-chain engineering is an effective way to develop non-fullerene acceptors for organic solar cells. A novel acceptor IT-BnC6-4F was designed and synthesized in this work, which showed a broader absorption spectrum and higher crystallinity than its analogue IT-4F. When blended with PT2, the IT-BnC6-4F based device achieved a high power conversion efficiency of 13.36%.
Article
Chemistry, Applied
Antonio Aguiar, Joana Farinhas, Wanderson da Silva, Isabel C. Santos, Luis Alcacer, Christopher M. A. Brett, Jorge Morgado, Abilio J. F. N. Sobral
Summary: This study reports the synthesis, characterization, and photovoltaic and light-emission applications of two series of BODIPY molecules with aryloxy or alkoxy groups bonded to the boron center, along with presenting the crystal structures of two new dyes. While the newly synthesized compounds did not outperform the parent boron-fluorinated BODIPYs in photovoltaic performance, they showed improved light-emitting properties with the replacement of fluorine by aryloxy/alkoxy groups in one of the series.
Review
Chemistry, Multidisciplinary
Meng Gao, Yuan Meng, Claire Shen, Qibing Pei
Summary: Stiffness variable materials, which can switch between a rigid and a soft state, have been widely applied in engineering fields. By introducing reversible crystallization and melting of side chains, researchers have achieved stiffness modulation in these materials. Besides stiffness, properties like stretchability, optical transmittance, and adhesion can also be altered.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Junjie Wang, Qingrui Luan, Pengchao Wang, Chenyu Han, Fuzhen Bi, Chunming Yang, Yonghai Li, Xichang Bao
Summary: Although NFREAs have lower synthetic costs, achieving high efficiencies in organic solar cells (OSCs) requires complex and expensive pre- or/and post-treatments. This study introduces phenylalkyl side groups (CnPh) to construct new NFREAs called BOR-CnPh without the need for additional treatments. The modified alkyl spacers of CnPh side groups control the acceptor's aggregation and regulate the interactions between donor (D) and acceptor (A). The optimization of the blend delivers efficient networks with a face-on orientation, resulting in the highest efficiency among as-cast OSCs based on NFREAs.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Applied
Yuzhang Xiao, Mengzhen Du, Qingling Nie, Bo Xiao, Qiang Guo, Chuanqi Dong, Yanfang Geng, Qing Guo, Erjun Zhou
Summary: The study investigates the modification of side chain structures to improve the photovoltaic performance of A(2)-A(1)-D-A(1)-A(2) type NFAs with P3HT. The results show that fine-tuning the middle D unit significantly influences the intermolecular interaction, while modulation of the side chains at A(1) and A(2) units can enhance power conversion efficiencies.
Article
Polymer Science
Chenxuan Sun, Xuekuan Ma, Lingling Ni, Mengru Ding, Jianfei Xia, Ying Zheng, Chengtao Yu, Bao Wang, Pengju Pan
Summary: Side substitution is an effective method for the chemical modification of linear polyesters, and the presence of side groups has a profound effect on the crystalline structure and phase transition of semicrystalline polyesters. This study synthesized polyesters with different side groups and investigated the effects of these groups on the crystal polymorph and phase transition of the substituted polyesters.
Article
Polymer Science
Masatoshi Hasegawa, Shunjiro Nagai, Seina Sokabe, Keita Ikeda, Junichi Ishii
Summary: A series of methacrylamides with benzoxazole mesogenic side groups and different alkyl unit lengths were synthesized, among which the n-dodecyl group-containing monomer and BO-containing polymethacrylamide exhibited excellent solubility and liquid crystallinity, leading to highly soluble polymer films with enhanced thermal conductivity. Additionally, a polyacrylate with BO mesogenic side groups showed enhanced thermal conductivity without fillers or external fields, making them promising candidates for novel heat-releasing materials.
POLYMER INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Taito Noda, Hisahiro Sasabe, Tsukasa Owada, Ryo Sugiyama, Ayato Arai, Kengo Kumada, Hisaki Tsuneyama, Yu Saito, Junji Kido
Summary: In this study, highly soluble multifunctional anthracene derivatives were developed and showed excellent luminescent properties, suitable for both evaporation- and solution-based systems.
Article
Materials Science, Multidisciplinary
Dehao Jiang, Hisahiro Sasabe, Hiroki Arai, Kohei Nakao, Kengo Kumada, Junji Kido
Summary: This study develops orange-red TADF emitters with high solubility and inhibition of concentration quenching through a novel molecular design strategy. The solution-processed OLEDs manufactured in this study achieve high external quantum efficiency and power efficiency.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hisaki Tsuneyama, Hisahiro Sasabe, Yu Saito, Taito Noda, Daiki Saito, Junji Kido
Summary: In this study, highly stable and efficient deep-red OLEDs were achieved by using a novel exciplex host system. The optimized device exhibited a lifetime that was 6.6 times longer than state-of-the-art deep-red OLEDs and maintained a high maximum external quantum efficiency at a low operating voltage.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Guanting Liu, Hisahiro Sasabe, Kengo Kumada, Hiroki Arai, Junji Kido
Summary: In this study, multiresonant thermally activated delayed fluorescent (TADF) materials embedded with nitrogen-boron-oxygen (N-B-O) were synthesized and characterized, with color-tunability between blue and green. The three emitter materials exhibited high photoluminescence quantum yield (PLQY) and narrow full width at half maximum (FWHM). By regulating the nonbonding/bonding molecular orbital characters, the emission color of m-DiNBO and p-DiNBO could be tuned from blue to green. Due to their expanded planar molecular structure, m-DiNBO and p-DiNBO showed high horizontal dipole ratio. OLEDs prepared with these materials exhibited high external quantum efficiencies and pure-color emission of different colors.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Natsuo Nagamura, Hisahiro Sasabe, Hiroki Sato, Nozomi Ito, Shoki Abe, Yoshihito Sukegawa, Daisuke Yokoyama, Hironori Kaji, Junji Kido
Summary: Using a tailored high triplet energy hole transport layer is an effective way to improve the efficiency and lifetime of organic light-emitting devices. In this study, two HTL materials were developed and showed excellent performance in terms of external quantum efficiency and operational lifetime in green phosphorescent OLEDs.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Manabu Yamada, Toshiaki Ohira, Nao Watanabe, Hiroshi Katagiri, Atsushi Shibayama, Fumio Hamada
Summary: In this study, a dithiophenol-based extractant bearing three sulfur atoms was developed to effectively and rapidly recover Pd(II) from the undiluted leachate of spent automotive catalysts. The Pd(II) extraction ability of this extractant was evaluated and its extraction mechanism was estimated using various experimental techniques.
Article
Chemistry, Multidisciplinary
Manabu Yamada, Ruka Yoshizaki, Fumiya Uemura, Hiroshi Katagiri, Sumio Kato, Kazuhiko Akimoto, Fumio Hamada
Summary: Conventional distillation methods are ineffective in separating compounds with similar boiling points and molecular sizes. However, crystalline thiacalixarene assemblies with preorganized channel-like adsorption sites have the capability to effectively separate such compounds.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Organic
Keigo Takamatsu, Rio Suzuki, Amane Matsunaga, Hiroshi Katagiri, Hiroyuki Konno
Summary: We developed a method for detecting unprotected amino groups using the reversible reaction of N-hydroxyphthalimide (NHPI). In this study, we conducted a structure-activity relationship study of NHPI derivatives to find the most suitable derivative for estimating chemical yields. We found that only NHPI derivatives with a specific framework produced intensely colored products when reacted with unprotected amino groups. Additionally, we successfully used this method to detect unprotected amino groups in five peptides.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Shoki Abe, Hisahiro Sasabe, Takeru Nakamura, Misaki Matsuya, Yu Saito, Takanori Hanayama, Suguru Araki, Kengo Kumada, Junji Kido
Summary: This study investigates the performance of dibenzofuran-end-capped hole-transport layer (HTL) in phosphorescent and TADF OLEDs. The research findings reveal that T1DBFBP demonstrates excellent EQE and lifetime.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Chemistry, Physical
Masashi Mamada, Hiroshi Katagiri, Chihaya Adachi
Summary: The effect of hydrogen bonding on TADF properties and photostability was evaluated using a clathrate crystal. The hydrogen bonding improved TADF properties but did not significantly affect photostability.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Takeru Nakamura, Hisahiro Sasabe, Shoki Abe, Kengo Kumada, Ryo Sugiyama, Takanori Hanayama, Junji Kido
Summary: In this study, a high-efficiency, long-lifetime, and high color purity green OLED was successfully developed using a BODIPY derivative. Through sophisticated device engineering and reducing carrier accumulation, the optimized device achieved a narrow full width at half maximum of 32 nm, CIE coordinates of (0.28, 0.67), approximately 19% external quantum efficiency, and a lifetime of 14 000 hours. The device stability was 4.7 times longer than previous works and among the best reported in the literature.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Chemistry, Medicinal
Yoshiaki Kitamura, Mahmoud Kandeel, Erina Oba, Chiori Iwai, Keitaro Iritani, Nanako Nagaya, Reo Namura, Hiroshi Katagiri, Hiroshi Ueda, Yukio Kitade
Summary: In this study, new candidates of carbasugar SGLT2 inhibitors were designed and synthesized using copper-catalyzed azide-alkyne cycloaddition. Cell-based assays showed dose-dependent SGLT2 inhibitory activity in the majority of these compounds. Compound 7c was identified as a promising novel SGLT2 inhibitor based on molecular dynamics simulations.
CHEMICAL & PHARMACEUTICAL BULLETIN
(2023)
Article
Materials Science, Multidisciplinary
Tomoya Kawano, Hisahiro Sasabe, Yu Saito, Yuhui Chen, Yuma Kori, Takeru Nakamura, Shoki Abe, Tomohiro Maruyama, Junji Kido
Summary: This study developed a series of tetrapyridine/triphenyltriazine-conjugated electron transport layers (ETLs) to achieve low-power-consumption organic light-emitting devices (OLEDs) with high stability. The green phosphorescent OLED based on T3PyTRZ showed a low turn-on voltage (V-on) of 2.18 V at 1 cd m(-2), with high external quantum efficiency, power efficiency, and long lifetime. Even at 1000 cd m(-2), the driving voltage was only 2.88 V. This performance is among the best reported to date.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Naoto Yoshida, Hisahiro Sasabe, Hiroki Arai, Yuki Sagae, Yuro Yagi, Keigo Hoshi, Daisuke Yokoyama, Junji Kido
Summary: The horizontal orientation of the emissive transition dipole moment (TDM) of TADF emitters plays a crucial role in the efficiency improvement of OLEDs. By introducing functional groups containing weak hydrogen bonds into the host material, the horizontal orientation ratio (Theta) of the TDM can be significantly increased. The physical parameters of the dispersed emitter also have a strong relationship with the Theta values, with glass transition temperature being another key parameter.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kengo Kumada, Hisahiro Sasabe, Misaki Matsuya, Naoto Yoshida, Keigo Hoshi, Takeru Nakamura, Haruki Nemma, Junji Kido
Summary: In this study, a series of novel phenylene-bridged MR-TADF emitters with varying numbers of carbazole units were developed. These emitters exhibited sky-blue emission, narrow-band emission, near-unity PLQY, and horizontal molecular orientation. By chemical modifications, the ACQ behavior was reduced and the molecular orientation was greatly enhanced.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)