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6. Self‐Healing Optical Structures for Light‐Trapping in Perovskite Solar Cells.

Author

Wan, Guanxiang, Alvianto, Ezra, Guo, Hongchen, Wang, Xi, Shin, Young‐Eun, Liang, Fang‐Cheng, Hou, Yi, and Tee, Benjamin C. K.

Subjects
SOLAR cells, OPTOELECTRONIC devices, YOUNG'S modulus, SHORT circuits, PEROVSKITE, PHOTOVOLTAIC power systems
Abstract

Self‐healing transparent polymers are advantageous for various optoelectronic devices to improve resilience and durability. However, most of these materials have been applied only as flat films and do not address the need for optical structures that can manipulate light. Here optical microstructures embossed on a self‐healing polyurea film are presented which can autonomously recover from damage in ambient conditions. The polyurea film have a high optical transmittance above 90% and haze below 1.3%, and Young's modulus of 3.4 MPa. When applied as a protective light‐trapping layer for perovskite solar cells, the champion device shows improved short circuit current density from 23.7 to 25.0 mA·cm−2, and power conversion efficiency from 21.5% to 23.0%. Furthermore, the solar cell with the light‐trapping layer has improved impact resistance and can recover its performance after being scratched. It is envisioned that self‐healing optical structures can be realized for different geometries and materials in a range of optoelectronic applications to produce resilient and durable devices. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Electrospun Nanofibers Embedded with Perovskite Quantum Dots

Author

Venkatesan, Manikandan, Veeramuthu, Loganathan, Liang, Fang-Cheng, Cho, Chia-Jung, Kuo, Chi-Ching, Hull, Robert, Series Editor, Jagadish, Chennupati, Series Editor, Kawazoe, Yoshiyuki, Series Editor, Kruzic, Jamie, Series Editor, Osgood, Richard M., Series Editor, Parisi, Jürgen, Series Editor, Pohl, Udo W., Series Editor, Seong, Tae-Yeon, Series Editor, Uchida, Shin-ichi, Series Editor, Wang, Zhiming M., Series Editor, Zhou, Ye, editor, and Wang, Yan, editor

Published
2020
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10. Functional Liquid Metal Polymeric Composites: Fundamentals and Applications in Soft Wearable Electronics.

Author

Liang, Fang‐Cheng and Tee, Benjamin C. K.

Subjects
*LIQUID metals, *METALLIC composites, *SURFACE stability, *POLYMER solutions, *WEARABLE technology
Abstract

Wearable and self‐healing soft electronics have led to a significant emphasis on their potential in creating versatile, conformable, and sustainable electronic modules. Among conductive additives, Liquid metals (LMs), combining both solid and liquid characteristics, have gained widespread attention due to their versatile physical, chemical, and electrical properties as well as self‐healing capability, biocompatibility, and recyclability. The fluidity of LMs facilitates adaptability to various experimental conditions and components for specific applications. Moreover, the oxide shell on LMs exhibits strong compatibility with surface functionalization and polymerization processes, enhancing the development of reliable composite materials. Herein, an in‐depth analysis of the fundamental properties and characteristics of LMs while addressing their current drawbacks, such as unpredictable reactivity and poor surface stability, is presented. To harness the advantages of LMs, their integration is extensively discussed with polymeric materials through various grafting strategies, leading to the development of macromolecular composites with exceptional softness, solubility, surface functionalization, and versatility. Furthermore, the applications of LMs within LM‐elastomer composites, particularly focusing on their relevance in specific fields such as flexible electronics, are investigated. Finally, LMs' future prospects are emphasized by highlighting their compatibility with self‐healing polymers, thereby providing pathways for major breakthroughs of LMs based devices. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Optimizing Emission Stability in Blue Perovskite Light‐Emitting Diodes via Oxygen‐Plasma Treatment of NixOy Hole Transport Layer.

Author

Yan, Zhen‐Li, Huang, Hong‐Yu, Benas, Jean‐Sebastien, Yang, Ching‐Wei, Su, Chun‐Jen, Liang, Fang‐Cheng, Chen, Wei‐Cheng, Tsai, Hsinhan, Jeng, Ru‐Jong, and Kuo, Chi‐Ching

Subjects
LIGHT emitting diodes, PEROVSKITE, NICKEL oxide, HOMOGENEOUS nucleation, CRYSTAL defects, OSTWALD ripening, NICKEL oxides
Abstract

Currently, wide‐color gamut perovskite light‐emitting diodes (PeLEDs) are commonly controlled through halide composition tuning. However, the formation of perovskite crystals involving different ion radii of halogens often results in structural fragility and ionic defects, leading to emission instability during operation. This study showcases a novel approach to achieving a homogeneous and low‐defect crystalline state by regulating the thermodynamic nucleation mechanism of sky‐blue perovskite, thereby enhancing emission stability. Utilizing oxygen‐plasma treatment, a highly uniform surface energy is ensured for the nickel oxide acting as a hole transport layer. This treatment not only induces homogeneous nucleation of the perovskite layer but also effectively suppresses crystal defects. Simultaneously, the uniform surface energy alleviates halide phase separation caused by Ostwald ripening. Upon optimizing the fabrication conditions for sky‐blue perovskite, the resulting PeLEDs, featuring an electroluminescent peak at 486 nm, attain a luminance of 1125.3 cd m−2 with exceptional electroluminescent stability and a T50 lifetime. Furthermore, gaining insights into the thermodynamic nucleation mechanism in mix‐halides and perovskites contributes to the advancement of research on sky‐blue PeLEDs and offers valuable perspectives for future development. [ABSTRACT FROM AUTHOR]

Published
2024
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19. Synergistic Effect of Cation Composition Engineering of Hybrid Cs1− xFAxPbBr 3 Nanocrystals for Self‐Healing Electronics Application (Adv. Mater. 9/2023)

Author

Liang, Fang‐Cheng, primary, Jhuang, Fu‐Cheng, additional, Fang, Yu‐Han, additional, Benas, Jean‐Sebastien, additional, Chen, Wei‐Cheng, additional, Yan, Zhen‐Li, additional, Lin, Wei‐Chun, additional, Su, Chun‐Jen, additional, Sato, Yuki, additional, Chiba, Takayuki, additional, Kido, Junji, additional, and Kuo, Chi‐Ching, additional

Published
2023
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21. Synergistic Effect of Cation Composition Engineering of Hybrid Cs 1−x FA x PbBr 3 Nanocrystals for Self‐Healing Electronics Application

Author

Liang, Fang‐Cheng, primary, Jhuang, Fu‐Cheng, additional, Fang, Yu‐Han, additional, Benas, Jean‐Sebastien, additional, Chen, Wei‐Cheng, additional, Yan, Zhen‐Li, additional, Lin, Wei‐Chun, additional, Su, Chun‐Jen, additional, Sato, Yuki, additional, Chiba, Takayuki, additional, Kido, Junji, additional, and Kuo, Chi‐Ching, additional

Published
2023
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29. Optimization of the Carrier Recombination and Transmission Properties in Perovskite Leds by Doping Poly (4-Vinylpyridine) and Graphene Quantum Dots Made of Chitin

Author

Yan, Zhen-Li, primary, Liang, Fang-Cheng, additional, Yeh, Chia-Yu, additional, Kurniawan, Darwin, additional, Benas, Jean-Sebastien, additional, Chen, Wei-Cheng, additional, Cho, Chia-Jung, additional, Chiang, Wei-Hung, additional, Jeng, Ru-Jong, additional, and Kuo, Chi-Ching, additional

Published
2022
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30. Enhancing the stability of the polymeric Lewis-base-assisted dual-phase 3D CsPbBr3–Cs4PbBr6 perovskite by molecular engineering and self-passivation.

Author

Liang, Fang-Cheng, Yan, Zhen-Li, Busipalli, Dhana Lakshmi, Benas, Jean-Sebastien, Zhang, Zhi-Xuan, Han, Su-Ting, Zhou, Ye, Jiang, Jyh-Chiang, and Kuo, Chi-Ching

Abstract

Inorganic metal halide perovskites have attracted attention for use in next-generation perovskite light-emitting diodes (PeLEDs) due to their excellent optical performance. However, the performance of most PeLEDs is influenced by surface defects and carrier diffusion properties. Herein, we present a facile and effective approach to form a self-ordered macromolecular intermediate phase by incorporating high molecular weight Lewis base polyvinylpyrrolidone (HM-PVP) within perovskite films. The synergistic effect of thermodynamically controlled perovskite grain growth and grain boundary passivation enables the formation of a highly cross-linked and bridged long-range-ordered polymer–perovskite composite. Furthermore, theoretical density functional theory calculations confirmed that C＝O groups in HM-PVP induce a shift of the electronic cloud toward the Pb2+ ions, resulting in a decrease in the perovskite surface energy and favoring thermodynamically modulated perovskite growth. Significantly, silver nanoparticle incorporation into the hole transport layer improves carrier transmission efficiency in HM-7% PVP bulk 3D perovskites and quasi-2D perovskite composite devices, exhibiting luminances of 12 000 cd m−2 and 9500 cd m−2 and current efficiencies of 11.5 cd A−1 and 15.4 cd A−1, respectively. Our results demonstrate that employing a polymeric passivating agent as a Lewis base adduct thermodynamically modulates perovskite growth and improves the perovskite film's quality for achieving highly stable PeLEDs. [ABSTRACT FROM AUTHOR]

Published
2023
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31. Super Tough and Spontaneous Water‐Assisted Autonomous Self‐Healing Elastomer for Underwater Wearable Electronics (Adv. Sci. 21/2021)

Author

He, Cyuan‐Lun, primary, Liang, Fang‐Cheng, additional, Veeramuthu, Loganathan, additional, Cho, Chia‐Jung, additional, Benas, Jean‐Sebastien, additional, Tzeng, Yung‐Ru, additional, Tseng, Yen‐Lin, additional, Chen, Wei‐Cheng, additional, Rwei, Alina, additional, and Kuo, Chi‐Ching, additional

Published
2021
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33. Super Tough and Spontaneous Water-Assisted Autonomous Self-Healing Elastomer for Underwater Wearable Electronics

Author

He, Cyuan Lun (author), Liang, Fang Cheng (author), Veeramuthu, Loganathan (author), Cho, Chia Jung (author), Benas, Jean Sebastien (author), Tzeng, Yung Ru (author), Tseng, Yen Lin (author), Chen, Wei Cheng (author), Rwei, A.Y. (author), Kuo, Chi Ching (author), He, Cyuan Lun (author), Liang, Fang Cheng (author), Veeramuthu, Loganathan (author), Cho, Chia Jung (author), Benas, Jean Sebastien (author), Tzeng, Yung Ru (author), Tseng, Yen Lin (author), Chen, Wei Cheng (author), Rwei, A.Y. (author), and Kuo, Chi Ching (author)

Abstract

Self-healing soft electronic material composition is crucial to sustain the device long-term durability. The fabrication of self-healing soft electronics exposed to high moisture environment is a significant challenge that has yet to be fully achieved. This paper presents the novel concept of a water-assisted room-temperature autonomous self-healing mechanism based on synergistically dynamic covalent Schiff-based imine bonds with hydrogen bonds. The supramolecular water-assisted self-healing polymer (WASHP) films possess rapid self-healing kinetic behavior and high stretchability due to a reversible dissociation–association process. In comparison with the pristine room-temperature self-healing polymer, the WASHP demonstrates favorable mechanical performance at room temperature and a short self-healing time of 1 h; furthermore, it achieves a tensile strain of 9050%, self-healing efficiency of 95%, and toughness of 144.2 MJ m−3. As a proof of concept, a versatile WASHP-based light-emitting touch-responsive device (WASHP-LETD) and perovskite quantum dot (PeQD)-based white LED backlight are designed. The WASHP-LETD has favorable mechanical deformation performance under pressure, bending, and strain, whereas the WASHP-PeQDs exhibit outstanding long-term stability even over a period exceeding one year in a boiling water environment. This paper provides a mechanically robust approach for producing eco-friendly, economical, and waterproof e-skin device components., ChemE/Product and Process Engineering

Published
2021
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34. Nanostructure- and Orientation-Controlled Resistive Memory Behaviors of Carbohydrate- block -Polystyrene with Different Molecular Weights via Solvent Annealing

Author

Chuang, Tsung-Han, Chiang, Yun-Chi, Hsieh, Hui-Ching, Isono, Takuya, Huang, Chao-Wei, Borsali, Redouane, Satoh, Toshifumi, Chen, Wen-Chang, Veeramuthu, Loganathan, Liang, Fang-Cheng, Zhang, Zhi-Xuan, Cho, Chia-Jung, Ercan, Ender, Chueh, Chu-Chen, Kuo, Chi-Ching, National Taiwan University [Taiwan] (NTU), Hokkaido University [Sapporo, Japan], National Taïwan University (NTU), Université Grenoble Alpes (UGA), Hokkaido University of Science, Nanayang Technological University (NTU), Nanayang Technological University, National Taipei University of technology [Taipei] (TAIPEI TECH), and National Taipei University of Technology

Subjects
Resistive touchscreen, Materials science, Nanostructure, Molecular mass, 010405 organic chemistry, Annealing (metallurgy), [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 01 natural sciences, 3. Good health, 0104 chemical sciences, Resistive random-access memory, [SPI.MAT]Engineering Sciences [physics]/Materials, Solvent, chemistry.chemical_compound, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Chemical engineering, Copolymer, General Materials Science, Polystyrene, ComputingMilieux_MISCELLANEOUS
Abstract

We report the resistive electrical memory characteristics controlled by the self-assembled nanostructures of maltoheptaose-block-polystyrene (MH-b-PS) block copolymers, where the MH and PS blocks p...

Published
2020

39. Novel Multifunctional Smart Textiles Application in Optoelectronic Devices

Author

Liang, Fang-Cheng, Centre de Recherches sur les Macromolécules Végétales (CERMAV), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Université Grenoble Alpes, National Taiwan University (Taipei), Redouane Borsali, Chi-Ching Kuo, and STAR, ABES

Subjects
Impression transfert, Polymérisation radicalaire, Electrospinning, Nanowires, Capteur chimique de pH et magnétique, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Free Radical Polymerization, Capteur de pression résistif, Resistive Pressure Sensor, PH and Magnetic Chemosensor, [CHIM.ORGA] Chemical Sciences/Organic chemistry, Transfer printing, Nanofils
Abstract

To date, the development of smart textiles, artificial skins, environmental sensory devices, and flexible/stretchable optoelectronics involve the innovation of material synthesis, mechanical design, and fabrication strategies have attracted considerable attention in wearable displays. The mechanically flexible and stretchable functions with cost-effective, facile, lightweight, and large-area expandability are essential modules to fabricate the optoelectronic devices in various wearable display applications. Among them, electrospinning is an easy, versatile, and inexpensive technique enables flexible morphology tuning, assembling various functional nanofibers, and high-throughput continuous production has motivated extensive studies on wearable electronics applications. Therefore, it is necessary to develop innovative projects including the environment-sensing elements with pH-sensing dependency, temperature-sensitive, full-color switchable chemosensors, stretchable electronics, and tactile sensors for various wearable electronics applications., A ce jour, le développement de textiles intelligents, de peaux artificielles, de capteurs de paramètres environnementaux et de composés optoélectroniques souples ; qui nécessite des innovations à la fois dans la synthèse des matériaux, leur conception mécanique mais aussi, à l’échelle industrielle, en stratégie de production ; présente un intérêt majeur dans le domaine du prêt-à-porter connecté. D’un point de vue mécanique, l’obtention des propriétés de flexibilité et d’étirabilité à faible coût, via un procédé simple, au sein d’un matériau léger et capable de s’expandre sur de grandes surfaces est un prérequis essentiel pour incorporer des dispositifs optoélectroniques au sein des objets connectés portables. Parmi les différents procédés couramment utilisés, l’electrospinning est une technique simple, facilement adaptable et peu onéreuse qui permet un ajustement fin et flexible des morphologies de fibres, l’assemblage de plusieurs nanofibres fonctionnelles et une production en continue à haut débit. Ces multiples avantages sont à l’origine des nombreux travaux concernant l’utilisation de l’electrospinning dans le domaine du prêt-à-porter électronique et/ou connecté. Cependant, il est nécessaire de développer des projets innovants pour ce secteur qui incluent des capteurs détectant des paramètres environnementaux (pH, température), des chemo-capteurs colorimétriques à large spectre (full-color), des composantes électroniques étirables et capteurs tactiles.

Published
2019

40. Novel ultra-stable and highly luminescent white light-emitting diodes from perovskite quantum dots-Polymer nanofibers through biaxial electrospinning

Author

Jiang, Dai-Hua, Tsai, Yi-Hsuan, Veeramuthu, Loganathan, Liang, Fang-Cheng, Chen, Lung-Chin, Lin, Chun Che, 1000080291235, Satoh, Toshifumi, Tung, Shih-Huang, Kuo, Chi-Ching, Jiang, Dai-Hua, Tsai, Yi-Hsuan, Veeramuthu, Loganathan, Liang, Fang-Cheng, Chen, Lung-Chin, Lin, Chun Che, 1000080291235, Satoh, Toshifumi, Tung, Shih-Huang, and Kuo, Chi-Ching

Abstract

Cesium lead halide perovskite quantum dots (QDs) have drawn extensive attention due to their excellent optical properties. However, their use is limited by poor stability. To enhance their stability, we electrospun perovskite-embedded fibers from composite CsPbX3 (X = Cl, Br, and I) perovskite QDs, blending with three polymers, poly(styrene-butadiene-styrene) (SBS), poly(methyl methacrylate) (PMMA), or polystyrene (PS), for the light-emitting diode (LED) applications. We found that the stretchable CsPbBr3@SBS fibers revealed the highest photoluminescence quantum yield, the CsPbBr3@PMMA fibers demonstrated a high thermal stability, and the CsPbBr3@PS fibers exhibited the best water-resistant stability. The photoluminescence intensity maintained 83% of its initial intensity for more than 3 months in water. Furthermore, the LED devices are manufactured from the blue chips and packaged with the core/shell red and green perovskite-based fibers by using biaxial electrospinning exhibited stable and highly efficient white luminescence. The luminance and efficiency are higher than 400% of the values of multilayered structures. (C) 2019 Author(s).

Published
2019

48. MXene-Reinforced Water Insensitive Self-Healing Piezoelectric Nanogenerator for Ambient and Aquatic Mechano-Pressure Sensing

Author

Sun, Ting-Wang, Venkatesan, Manikandan, Hsu, Yung-Chi, Chandrasekar, Jayashree, Chen, Wei-Cheng, Bénas, Jean-Sébastien, Cho, Chia-Jung, Lin, Ja-Hon, Liang, Fang-Cheng, Rwei, Alina Y., and Kuo, Chi-Ching

Abstract

The development of soft electronic devices capable of autonomous self-healing (SH) holds immense potential across various endeavours, promising to revolutionize product durability, reliability, and maintenance practices. Despite some progress has been made, underwater stable SH continues to be an active area of research. Herein, SH polymer PDMS-MDI0.4-TFB0.6(SHP) with excellent mechanical property was composited with MXene to investigate the piezoelectric nature under various circumstance. By leveraging MXene into SHP not only improves the material properties of mechanical stress but also permittivity of the elastomer. Thus, MXene incorporated SHP (mSHP) induce high polarized charges under mechanical pressure. The fabrication of mSHP piezoelectric nanogenerator (mSHP-PENG) device via spray coating AgNWs on the surface forms ohmic contact, which facilitate high sensitivity and flexibility. Nevertheless, the generated piezoelectricity (30V, 4.2 μA: 3Hz) upon mechanical pressure gives maximum power density of 128 μW/m2indicating that our device can act as a reliable power source for portable electronic gadgets. In addition, SHP with amphiphilic functional groups sustain the original shape even after immerse into water for so long. Taking this into account, our device undergoes effective deformation even at low pressures, thus render to fabricate touch sensitive piezo-switches for both atmospheric and aquatics environments.

Published
2024
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