The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Alberto Salleo - One of the best experts on this subject based on the ideXlab platform.
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effects of confinement on microstructure and charge transport in high performance Semicrystalline Polymer semiconductors
Advanced Functional Materials, 2013Co-Authors: Scott Himmelberger, Martin Heeney, Iain Mcculloch, Leslie H Jimison, Michael F Toney, Javier Dacuna, Jonathan Rivnay, Thomas Mccarthyward, Alberto SalleoAbstract:The film thickness of one of the most crystalline and highest performing Polymer semiconductors, poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT), is varied in order to determine the effects of interfaces and confinement on the microstructure and performance in organic field effect transistors (OFETs). Crystalline texture and overall film crystallinity are found to depend strongly on film thickness and thermal processing. The angular distribution of crystallites narrows upon both a decrease in film thickness and thermal annealing. These changes in the film microstructure are paired with thin-film transistor characterization and shown to be directly correlated with variations in charge carrier mobility. Charge transport is shown to be governed by film crystallinity in films below 20 nm and by crystalline orientation for thicker films. An optimal thickness is found for PBTTT at which the mobility is maximized in unannealed films and where mobility reaches a plateau at its highest value for annealed films.
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drastic control of texture in a high performance n type Polymeric semiconductor and implications for charge transport
Macromolecules, 2011Co-Authors: Jonathan Rivnay, Leslie H Jimison, Michael F Toney, Robert Steyrleuthner, Alberto Casadei, Zhihua Chen, Antonio Facchetti, Dieter Neher, Alberto SalleoAbstract:Control of crystallographic texture from mostly face-on to edge-on is observed for the film morphology of the n-type Semicrystalline Polymer {[N,N-9-bis(2-octyldodecyl)naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,59-(2,29-bithiophene)}, P(NDI2OD-T2), when annealing the film to the Polymer melting point followed by slow cooling to ambient temperature. A variety of X-ray diffraction analyses, including pole figure construction and Fourier transform peak shape deconvolution, are employed to quantify the texture change, relative degree of crystallinity and lattice order. We find that annealing the Polymer film to the melt leads to a shift from 77.5% face-on to 94.6% edge-on lamellar texture as well as to a 2-fold increase in crystallinity and a 40% decrease in intracrystallite cumulative disorder. The texture change results in a significant drop in the electron-only diode current density through the film thickness upon melt annealing, while little change is observed in the in-plane transport of bott...
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quantification of thin film crystallographic orientation using x ray diffraction with an area detector
Langmuir, 2010Co-Authors: Jessica L Baker, Leslie H Jimison, Stefan C B Mannsfeld, Steven K Volkman, Vivek Subramanian, Alberto Salleo, Paul A Alivisatos, Michael F ToneyAbstract:As thin films become increasingly popular (for solar cells, LEDs, microelectronics, batteries), quantitative morphological and crystallographic information is needed to predict and optimize the film’s electrical, optical, and mechanical properties. This quantification can be obtained quickly and easily with X-ray diffraction using an area detector in two sample geometries. In this paper, we describe a methodology for constructing complete pole figures for thin films with fiber texture (isotropic in-plane orientation). We demonstrate this technique on Semicrystalline Polymer films, self-assembled nanoparticle semiconductor films, and randomly packed metallic nanoparticle films. This method can be immediately implemented to help understand the relationship between film processing and microstructure, enabling the development of better and less expensive electronic and optoelectronic devices.
Michael F Toney - One of the best experts on this subject based on the ideXlab platform.
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effects of confinement on microstructure and charge transport in high performance Semicrystalline Polymer semiconductors
Advanced Functional Materials, 2013Co-Authors: Scott Himmelberger, Martin Heeney, Iain Mcculloch, Leslie H Jimison, Michael F Toney, Javier Dacuna, Jonathan Rivnay, Thomas Mccarthyward, Alberto SalleoAbstract:The film thickness of one of the most crystalline and highest performing Polymer semiconductors, poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT), is varied in order to determine the effects of interfaces and confinement on the microstructure and performance in organic field effect transistors (OFETs). Crystalline texture and overall film crystallinity are found to depend strongly on film thickness and thermal processing. The angular distribution of crystallites narrows upon both a decrease in film thickness and thermal annealing. These changes in the film microstructure are paired with thin-film transistor characterization and shown to be directly correlated with variations in charge carrier mobility. Charge transport is shown to be governed by film crystallinity in films below 20 nm and by crystalline orientation for thicker films. An optimal thickness is found for PBTTT at which the mobility is maximized in unannealed films and where mobility reaches a plateau at its highest value for annealed films.
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drastic control of texture in a high performance n type Polymeric semiconductor and implications for charge transport
Macromolecules, 2011Co-Authors: Jonathan Rivnay, Leslie H Jimison, Michael F Toney, Robert Steyrleuthner, Alberto Casadei, Zhihua Chen, Antonio Facchetti, Dieter Neher, Alberto SalleoAbstract:Control of crystallographic texture from mostly face-on to edge-on is observed for the film morphology of the n-type Semicrystalline Polymer {[N,N-9-bis(2-octyldodecyl)naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,59-(2,29-bithiophene)}, P(NDI2OD-T2), when annealing the film to the Polymer melting point followed by slow cooling to ambient temperature. A variety of X-ray diffraction analyses, including pole figure construction and Fourier transform peak shape deconvolution, are employed to quantify the texture change, relative degree of crystallinity and lattice order. We find that annealing the Polymer film to the melt leads to a shift from 77.5% face-on to 94.6% edge-on lamellar texture as well as to a 2-fold increase in crystallinity and a 40% decrease in intracrystallite cumulative disorder. The texture change results in a significant drop in the electron-only diode current density through the film thickness upon melt annealing, while little change is observed in the in-plane transport of bott...
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quantification of thin film crystallographic orientation using x ray diffraction with an area detector
Langmuir, 2010Co-Authors: Jessica L Baker, Leslie H Jimison, Stefan C B Mannsfeld, Steven K Volkman, Vivek Subramanian, Alberto Salleo, Paul A Alivisatos, Michael F ToneyAbstract:As thin films become increasingly popular (for solar cells, LEDs, microelectronics, batteries), quantitative morphological and crystallographic information is needed to predict and optimize the film’s electrical, optical, and mechanical properties. This quantification can be obtained quickly and easily with X-ray diffraction using an area detector in two sample geometries. In this paper, we describe a methodology for constructing complete pole figures for thin films with fiber texture (isotropic in-plane orientation). We demonstrate this technique on Semicrystalline Polymer films, self-assembled nanoparticle semiconductor films, and randomly packed metallic nanoparticle films. This method can be immediately implemented to help understand the relationship between film processing and microstructure, enabling the development of better and less expensive electronic and optoelectronic devices.
Chenyang Xing - One of the best experts on this subject based on the ideXlab platform.
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Semicrystalline Polymer binary phase structure templated quasi block graft coPolymers
Journal of Physical Chemistry B, 2017Co-Authors: Jipeng Guan, Yanyuan Wang, Chenyang XingAbstract:Herein, we report a simple strategy to synthesize quasi-block graft coPolymers using the binary phase structure of Semicrystalline Polymers as the template. An unsaturated ionic liquid, 1-vinyl-3-butylimidazolium bis (trifluoromethylsulfonyl) imide ([VBIm] [TFSI]), is thermodynamically miscible with poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) in solution. The solidification of P(VDF-co-HFP)/[VBIm] [TFSI] blend leads to the expelling of ILs from the crystalline region and the ILs are only located in the amorphous region. The electron-beam irradiation (EBI) at the solid state of the blends results in the locally grafting of the ILs onto the Polymer blocks in the amorphous region, while the EBI does not affect the chemical structure of the crystalline region. Therefore, the quasi-block graft coPolymers were achieved with IL-grafted blocks segregated by the unmodified blocks. The achieved block coPolymers can be microphase separated into the various nanostructures, as the block coPolymers...
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Semicrystalline Polymer Binary-Phase Structure Templated Quasi-Block Graft CoPolymers
2017Co-Authors: Jipeng Guan, Yanyuan Wang, Chenyang XingAbstract:Herein, we report a simple strategy to synthesize quasi-block graft coPolymers using the binary phase structure of Semicrystalline Polymers as the template. An unsaturated ionic liquid, 1-vinyl-3-butylimidazolium bis (trifluoromethylsulfonyl) imide ([VBIm] [TFSI]), is thermodynamically miscible with poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) in solution. The solidification of P(VDF-co-HFP)/[VBIm] [TFSI] blend leads to the expelling of ILs from the crystalline region and the ILs are only located in the amorphous region. The electron-beam irradiation (EBI) at the solid state of the blends results in the locally grafting of the ILs onto the Polymer blocks in the amorphous region, while the EBI does not affect the chemical structure of the crystalline region. Therefore, the quasi-block graft coPolymers were achieved with IL-grafted blocks segregated by the unmodified blocks. The achieved block coPolymers can be microphase separated into the various nanostructures, as the block coPolymers with well-defined structure, upon varying the grafting ratios. The microphase separated quasi-block grafted coPolymers exhibit excellent mechanical properties and good electrical properties. The elongation at break is 480% and the stress at break is as high as 30 MPa for the sample with the lamellar-like structure having the grafting ratio of 45.4 wt%
Kilwon Cho - One of the best experts on this subject based on the ideXlab platform.
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effect of substrate surface energy on transcrystalline growth and its effect on interfacial adhesion of Semicrystalline Polymers
Macromolecules, 2003Co-Authors: Kilwon Cho, Do Hwan Kim, Soong YoonAbstract:The effect of substrate surface energy on transcrystalline growth at the interface of a Semicrystalline Polymer and its effect on interfacial adhesion were investigated for substrates treated with various silane coupling agents. A thin film of isotactic polypropylene (iPP) crystallized on a high surface energy substrate (treated with γ-(aminopropyl)triethoxysilane) was composed entirely of transcrystallites. On the other hand, when the iPP film was crystallized on a low surface energy substrate (treated with perfluorodecyltrichlorosilane), the interface was dominated by spherulites, and only a very thin transcrystalline region (thickness ∼1 μm) was observed. The substrate surface energy was found to exert a significant influence on the crystallinity, density of nuclei, crystal microstructure (e.g., lamellar thickness and crystal orientation), and thickness of the transcrystalline region near the interface. The adhesion energy measured by the asymmetric double cantilever beam (ADCB) test increased strongly...
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reinforcement of amorphous and Semicrystalline Polymer interfaces via in situ reactive compatibilization
Macromolecules, 1998Co-Authors: Kilwon ChoAbstract:The interfacial reinforcement between polypropylene (PP) and amorphous polyamide (aPA) has been investigated by in-situ reactive compatibilization. PP reactivity with aPA was introduced by melt ble...
Tingyu Lu - One of the best experts on this subject based on the ideXlab platform.
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thermal transport in Semicrystalline polyethylene by molecular dynamics simulation
Journal of Applied Physics, 2018Co-Authors: Tingyu Lu, Xiaobo Li, Jun Zhou, Gang ChenAbstract:Recent research has highlighted the potential to achieve high-thermal-conductivity Polymers by aligning their molecular chains. Combined with other merits, such as low-cost, corrosion resistance, and light weight, such Polymers are attractive for heat transfer applications. Due to their quasi-one-dimensional structural nature, the understanding on the thermal transport in those ultra-drawn Semicrystalline Polymer fibers or films is still lacking. In this paper, we built the ideal repeating units of Semicrystalline polyethylene and studied their dependence of thermal conductivity on different crystallinity and interlamellar topology using the molecular dynamics simulations. We found that the conventional models, such as the Choy-Young's model, the series model, and Takayanagi's model, cannot accurately predict the thermal conductivity of the quasi-one-dimensional Semicrystalline polyethylene. A modified Takayanagi's model was proposed to explain the dependence of thermal conductivity on the bridge number a...
