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367 results on '"Chuang, Wei-Tsung"'

7. Modulating phase segregation during spin‐casting of fullerene‐based polymer solar‐cell thin films upon minor addition of a high‐boiling co‐solvent.

Author

Lu, Kuan-Hsun, Wu, Wei-Ru, Su, Chun-Jen, Yang, Po-Wei, Yamada, Norifumi L., Zhuo, Hong-Jun, Chen, Show-An, Chuang, Wei-Tsung, Lan, Yi-Kang, Su, An-Chung, and Jeng, U-Ser

Abstract

The impact of additives on the nanoscale structures of spin‐cast polymer composite films, particularly in polymer solar cells, is a topic of significant interest. This study focuses on the blend film comprising poly(thieno[3,4‐b]thiophene‐alt‐benzodithiophene) (PTB7) and [6,6]‐phenyl‐C71‐butyric acid methyl ester (PC71BM), exploring how additives like 1,8‐diiodooctane (DIO) influence the film structures spin‐cast from chlorobenzene solution. Combined results of specular X‐ray and neutron reflectivity, grazing‐incidence small‐ and wide‐angle X‐ray scattering (GISAXS and GIWAXS), and X‐ray photoelectron spectroscopy indicate that DIO could significantly enhance the dispersion of PC71BM and reduce composition inhomogeneity in the film. Time‐resolved GISAXS–GIWAXS with 100 ms resolution further captures a rapid spinodal decomposition of the mixture within 1 s in the constant‐evaporation stage of spin‐casting. Further combined with parallel analysis of time‐resolved UV–Vis reflectance, these findings reveal that DIO mitigates the spinodal decomposition process by accelerating solvent evaporation, which, in turn, decelerates phase segregation, leading to a nucleation‐driven process. These observations provide mechanistic insights into the role of additives in controlling the nanostructural evolution of spin‐cast films by altering the kinetics of solvent evaporation and phase separation during the spin‐coating process. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Ultrahigh toughness of stretchable ratiometric mechanofluorescent polyurethane elastomers enhanced by dual slide-ring motion of polyrotaxane cross-linkers and daisy chain backbones.

Author

Cuc, Tu Thi Kim, Tso, Yun-Chen, Wu, Ting-Chi, Nhien, Pham Quoc, Khang, Trang Manh, Hue, Bui Thi Buu, Chuang, Wei-Tsung, and Lin, Hong-Cheu

Abstract

The first integration of dual slide-ring motion of [c2] daisy chain molecules (as backbones) and α-cyclodextrin (α-CD)-based polyrotaxanes (as cross-linkers) into mechanofluorophoric polyurethane (PU) frameworks was successfully proceeded through step-growth polymerization to yield PU films with distinctive mechanical and optical properties under stress. The intrinsic elastic and stretchable capabilities of the PU films consisting of both mechanically interlocked molecules (MIMs) via the molecular design of daisy chain backbones and polyrotaxane cross-linkers with long gliding movements were evidently enhanced, where the contributions of both extended/contracted forms in daisy chains and different α-CD numbers in polyrotaxane cross-linkers were also investigated. Moreover, reversible ratiometric fluorescence and energy transfer features between green-emitting naphthalimide donors and yellow-orange-emitting mechanofluorophoric rhodamine acceptors could be attained during stretching and relaxation processes. In addition, the stretching deformation of PU films was studied using X-ray diffraction (XRD) techniques for confirming the correlated morphological properties of stretching states in the oriented PU films. Appealingly, notable shape recovery and reversible ratiometric mechanofluorescence behavior of PU films could be achieved upon heating, signifying the potential of PU films with artificial molecular muscle functions of daisy chains accompanied by pulley effects of polyrotaxane cross-linkers, offering excellent mechanical and optical characteristics for various applications in advanced functional materials. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Phenoxy Group-Containing Asymmetric Non-Fullerene Acceptors Achieved Higher VOC over 1.0 V through Alkoxy Side-Chain Engineering for Organic Solar Cells

Author

Wang, Chuan-Hsin, primary, Busireddy, Manohar Reddy, additional, Huang, Sheng-Ci, additional, Nie, Hebing, additional, Liu, Yu-Shuo, additional, Lai, Bing-Yong, additional, Meng, Ling-Huan, additional, Chuang, Wei-Tsung, additional, Scharber, Markus C., additional, Chen, Jiun-Tai, additional, and Hsu, Chain-Shu, additional

Published
2023
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21. Thermophilic Artificial Water Channels of a Lipid-Like Dendron Stabilized by Water-Containing Hydrogen-Bonded Network

Author

Chen, Chin-Yi, primary, Chen, Yuan, additional, Chang, Ting-Yen, additional, Lee, Mu-Tzu, additional, Liu, Shao-Yuan, additional, Yu, Ya-Ching, additional, Lin, Yu-Hsuan, additional, Lee, Cheng-Hsuan, additional, Chen, Hsin-Lung, additional, Wu, Kuan-Yi, additional, Chuang, Wei-Tsung, additional, and Wang, Chien-Lung, additional

Published
2023
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30. Charge–Discharge Mechanism of High‐Entropy Co‐Free Spinel Oxide Toward Li + Storage Examined Using Operando Quick‐Scanning X‐Ray Absorption Spectroscopy

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Luo, Xu-Feng, Patra, Jagabandhu, Chuang, Wei-Tsung, Nguyen, Thi Xuyen, Ting, Jyh-Ming, Li, Ju, Pao, Chih-Wen, Chang, Jeng-Kuei, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Luo, Xu-Feng, Patra, Jagabandhu, Chuang, Wei-Tsung, Nguyen, Thi Xuyen, Ting, Jyh-Ming, Li, Ju, Pao, Chih-Wen, and Chang, Jeng-Kuei

Abstract

Transition metal high-entropy oxides (HEOs) are an attractive class of anode materials for high-performance lithium-ion batteries (LIBs). However, owing to the multiple electroactive centers of HEOs, the Li+ storage mechanism is complex and debated in the literature. In this work, operando quick-scanning X-ray absorption spectroscopy (XAS) is used to study the lithiation/delithiation mechanism of the Cobalt-free spinel (CrMnFeNiCu)3 O4 HEO. A monochromator oscillation frequency of 2 Hz is used and 240 spectra are integrated to achieve a 2 min time resolution. High-photon-flux synchrotron radiation is employed to increase the XAS sensitivity. The results indicate that the Cu2+ and Ni2+ cations are reduced to their metallic states during lithiation but their oxidation reactions are less favorable compared to the other elements upon delithiation. The Mn2+/3+ and Fe2+/3+ cations undergo two-step conversion reactions to form metallic phases, with MnO and FeO as the intermediate species, respectively. During delithiation, the oxidation of Mn occurs prior to that of Fe. The Cr3+ cations are reduced to CrO and then Cr0 during lithiation. A relatively large overpotential is required to activate the Cr reoxidation reaction. The Cr3+ cations are found after delithiation. These results can guide the material design of HEOs for improving LIB performance.

Published
2023

44. Phenoxy Group-Containing Asymmetric Non-Fullerene Acceptors Achieved Higher VOCover 1.0 V through Alkoxy Side-Chain Engineering for Organic Solar Cells

Author

Wang, Chuan-Hsin, Busireddy, Manohar Reddy, Huang, Sheng-Ci, Nie, Hebing, Liu, Yu-Shuo, Lai, Bing-Yong, Meng, Ling-Huan, Chuang, Wei-Tsung, Scharber, Markus C., Chen, Jiun-Tai, and Hsu, Chain-Shu

Abstract

Alkoxy side chain engineering on the β-position of the thienothiophene units of Y6 derivatives plays a vital role in improving photovoltaic performances with simultaneously increasing open-circuit voltage (Voc) and fill factor (FF). In this work, we prepared a series of asymmetric non-fullerene acceptors (NFAs) by introducing alkoxy side chains and phenoxy groups on the state-of-the-art Y6-derivative BTP-BO-4F. For the comparison, 2O-BO-4F with a symmetric alkoxy side chain on the outer thiophene units and BTP-PBO-4F with an asymmetric N-attached phenoxy alkyl chain on the pyrrole ring are synthesized from BTP-BO-4F. Thereafter, we construct four asymmetric NFAs by introducing different lengths of linear/branched alkoxy chains on the β-position of the thienothiophene units of BTP-PBO-4F. The resulting NFAs, named L10-PBO, L12-PBO, B12-PBO, and B16-PBO (L = linear and B = branched alkoxy side chains), are collectively called OR-PBO-series. Unexpectedly, all OR-PBO NFAs exhibit strong edge-on molecular packing and weaker π–π interactions in the film state, which diminish the charge transfer in organic solar cell (OSC) devices. As a consequence, the optimal devices of OR-PBO-based binary blends show poor photovoltaic performances [power conversion efficiency (PCE) = 6.52–9.62%] in comparison with 2O-BO-4F (PCE = 12.42%) and BTP-PBO-4F (PCE = 15.30%) reference blends. Nevertheless, the OR-PBO-based binary devices show a higher Vocand smaller Vloss. Especially, B12-PBO- and B16-PBO-based devices achieve Vocover 1.00 V, which is the highest value of Y-series OSC devices to the best of our knowledge. Therefore, by utilizing higher Vocof OR-PBO binary blends, B12-PBO and B16-PBO are incorporated into the PM6:BTP-PBO-4F-based binary blend and fabricated ternary devices. As a result, the PM6:BTP-PBO-4F:B12-PBO ternary device delivers the best PCE of 15.60% with an increasing Vocand FF concurrently.

Published
2023
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46. Recognizing the Importance of Fast Nonisothermal Crystallization for High-Performance Two-Dimensional Dion–Jacobson Perovskite Solar Cells with High Fill Factors: A Comprehensive Mechanistic Study

Author

Liu, Yi-Chun, primary, Lin, Jin-Tai, additional, Lee, Yao-Lin, additional, Hung, Chieh-Ming, additional, Chou, Tai-Che, additional, Chao, Wei-Chih, additional, Huang, Zhi-Xuan, additional, Chiang, Tzu-Hsuan, additional, Chiu, Ching-Wen, additional, Chuang, Wei-Tsung, additional, and Chou, Pi-Tai, additional

Published
2022
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