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Zhibo Yuan

Bio: Zhibo Yuan is an academic researcher from Georgia Institute of Technology. The author has contributed to research in topics: Porphyrin & Conjugated system. The author has an hindex of 12, co-authored 17 publications receiving 491 citations. Previous affiliations of Zhibo Yuan include Applied Materials & Western Kentucky University.

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TL;DR: In this article, the impact of fiber length and anisotropy on macroscopic charge transport performance was evaluated using an organic field effect transistor (OFET) architecture, and both aged and sonicated solutions exhibited charge carrier mobilities that were an order of magnitude higher than that obtained for pristine samples.
Abstract: Long-range ordering emerges in poly(3-hexylthiophene) (P3HT) solutions during time-dependent aggregation. Here, aggregation of P3HT in chloroform solution was induced by ultrasonication, aging, and combinations thereof. UV–vis spectroscopy and polarized optical microscopy demonstrated that long-range ordering in the solution and subsequently the solid state depends on assembled P3HT fiber length, as determined by film atomic force microscopy. Ultrasonication induced the formation of fibers that were relatively short compared to those obtained through aging. As a result, ultrasonication afforded isotropic solutions and films, whereas aging afforded anisotropic solutions and films. The impact of fiber length and anisotropy on macroscopic charge transport performance was evaluated using an organic field-effect transistor (OFET) architecture. Both aged and sonicated solutions exhibited charge carrier mobilities that were an order of magnitude higher than that obtained for pristine samples. Aging of sonicated ...

99 citations

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TL;DR: In this article, a self-organized versatile conjugated polymer film displaying an interpenetrating polymer network is formed in the semiconducting films and is crucial for the observed enhancement of elasticity, optical transparency, and charge-carr...
Abstract: The pursuit of intelligent optoelectronics could have profound implications on our future daily life. Simultaneous enhancement of the electrical performance, mechanical stretchability, and optical transparency of semiconducting polymers may significantly broaden the spectrum of realizable applications for these materials in future intelligent optoelectronics, i.e., wearable devices, electronic skin, stretchable displays, and a vast array of biomedical sensors. Here, semiconducting films with significantly improved mechanical elasticity and optical transparency, without affecting the film’s electronic conductivity even under 100% strain, were prepared by blending only a small amount (below 1 wt %) of either p-type or n-type commercial semiconductor polymers. We demonstrate that a self-organized versatile conjugated polymer film displaying an interpenetrating polymer network is formed in the semiconducting films and is crucial for the observed enhancement of elasticity, optical transparency, and charge-carr...

85 citations

Journal ArticleDOI
TL;DR: In this article, 2,2′-bithiazole was synthesized in one step and copolymerized with dithienyldiketopyrrolopyrrole to afford poly(dithienymylldiketsopyrylopyrdrug-biomethane)-bithiaide, PDBTz, which exhibited electron mobility reaching 0.3 cm2 V 1 s−1 in organic field effect transistor (OFET) configuration.
Abstract: The electron deficiency and trans-planar conformation of bithiazole is potentially beneficial for the electron-transport performance of organic semiconductors. However, the incorporation of bithiazole into polymers through a facile synthetic strategy remains a challenge. Herein, 2,2′-bithiazole was synthesized in one step and copolymerized with dithienyldiketopyrrolopyrrole to afford poly(dithienyldiketopyrrolopyrrole-bithiazole), PDBTz. PDBTz exhibited electron mobility reaching 0.3 cm2 V–1 s–1 in organic field-effect transistor (OFET) configuration; this contrasts with a recently discussed isoelectronic conjugated polymer comprising an electron-rich bithiophene and dithienyldiketopyrrolopyrrole, which displays merely hole-transport characteristics. This inversion of charge-carrier transport characteristics confirms the significant potential for bithiazole in the development of electron-transport semiconducting materials. Branched 5-decylheptacyl side chains were incorporated into PDBTz to enhance polyme...

79 citations

Journal ArticleDOI
20 Apr 2018-ACS Nano
TL;DR: A connection is established between the material surface energy, absorption, and vertical stratification, which can then be linked to photovoltaic conversion characteristics and synchronized enhancement in external quantum efficiency and power conversion efficiencies over 10.5%.
Abstract: High-efficiency organic solar cells (OSCs) can be produced through optimization of component molecular design, coupled with interfacial engineering and control of active layer morphology. However, vertical stratification of the bulk-heterojunction (BHJ), a spontaneous activity that occurs during the drying process, remains an intricate problem yet to be solved. Routes toward regulating the vertical separation profile and evaluating the effects on the final device should be explored to further enhance the performance of OSCs. Herein, we establish a connection between the material surface energy, absorption, and vertical stratification, which can then be linked to photovoltaic conversion characteristics. Through assessing the performance of temporary, artificial vertically stratified layers created by the sequential casting of the individual components to form a multilayered structure, optimal vertical stratification can be achieved. Adjusting the surface energy offset between the substrate results in donor...

72 citations


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TL;DR: An all-inclusive review of the newly developed WFHE along with a summary of imperative requirements of material properties, sensor capabilities, electronics performance, and skin integrations is provided.
Abstract: Recent advances in soft materials and system integration technologies have provided a unique opportunity to design various types of wearable flexible hybrid electronics (WFHE) for advanced human healthcare and human-machine interfaces. The hybrid integration of soft and biocompatible materials with miniaturized wireless wearable systems is undoubtedly an attractive prospect in the sense that the successful device performance requires high degrees of mechanical flexibility, sensing capability, and user-friendly simplicity. Here, the most up-to-date materials, sensors, and system-packaging technologies to develop advanced WFHE are provided. Details of mechanical, electrical, physicochemical, and biocompatible properties are discussed with integrated sensor applications in healthcare, energy, and environment. In addition, limitations of the current materials are discussed, as well as key challenges and the future direction of WFHE. Collectively, an all-inclusive review of the newly developed WFHE along with a summary of imperative requirements of material properties, sensor capabilities, electronics performance, and skin integrations is provided.

554 citations

Journal ArticleDOI
TL;DR: Specific focus is placed on the development of new macrocycle hosts since 2010, coupled with considerations of the underlying principles of supramolecular chemistry as well as analytes of interest and common luminophores.
Abstract: There is great need for stand-alone luminescence-based chemosensors that exemplify selectivity, sensitivity, and applicability and that overcome the challenges that arise from complex, real-world media. Discussed herein are recent developments toward these goals in the field of supramolecular luminescent chemosensors, including macrocycles, polymers, and nanomaterials. Specific focus is placed on the development of new macrocycle hosts since 2010, coupled with considerations of the underlying principles of supramolecular chemistry as well as analytes of interest and common luminophores. State-of-the-art developments in the fields of polymer and nanomaterial sensors are also examined, and some remaining unsolved challenges in the area of chemosensors are discussed.

463 citations

Journal ArticleDOI
TL;DR: This review summarizes and analyzes recent advances in materials concepts as well as in thin-film fabrication techniques for high- k gate dielectrics when integrated with FSE-compatible semiconductors such as organics, metal oxides, quantum dot arrays, carbon nanotubes, graphene, and other 2D semiconductor types.
Abstract: Recent advances in flexible and stretchable electronics (FSE), a technology diverging from the conventional rigid silicon technology, have stimulated fundamental scientific and technological research efforts. FSE aims at enabling disruptive applications such as flexible displays, wearable sensors, printed RFID tags on packaging, electronics on skin/organs, and Internet-of-things as well as possibly reducing the cost of electronic device fabrication. Thus, the key materials components of electronics, the semiconductor, the dielectric, and the conductor as well as the passive (substrate, planarization, passivation, and encapsulation layers) must exhibit electrical performance and mechanical properties compatible with FSE components and products. In this review, we summarize and analyze recent advances in materials concepts as well as in thin-film fabrication techniques for high-k (or high-capacitance) gate dielectrics when integrated with FSE-compatible semiconductors such as organics, metal oxides, quantum...

459 citations

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TL;DR: This Account covers recent important advances in skin-inspired electronics, from basic material developments to device components and proof-of-concept demonstrations for integrated bioelectronics applications, and highlights examples of skin- inspired electronics for three major applications: prosthetic e-skins, wearable electronics, and implantable electronics.
Abstract: ConspectusFuture electronics will take on more important roles in people’s lives. They need to allow more intimate contact with human beings to enable advanced health monitoring, disease detection, medical therapies, and human–machine interfacing. However, current electronics are rigid, nondegradable and cannot self-repair, while the human body is soft, dynamic, stretchable, biodegradable, and self-healing. Therefore, it is critical to develop a new class of electronic materials that incorporate skinlike properties, including stretchability for conformable integration, minimal discomfort and suppressed invasive reactions; self-healing for long-term durability under harsh mechanical conditions; and biodegradability for reducing environmental impact and obviating the need for secondary device removal for medical implants. These demands have fueled the development of a new generation of electronic materials, primarily composed of polymers and polymer composites with both high electrical performance and skinl...

373 citations

Journal ArticleDOI

339 citations