Efficient organic optoelectronics with multilayer structures

Kuo, Tsung Hsien; Chen, Fang‐Chung; Li, Juo Hao; Huang, Ahong; Huang, Jen Hsien; Ho, Kuo–Chuan; Chu, Chih Wei

doi:10.1039/c1jm13373j

Cited by 17 publications

(26 citation statements)

References 33 publications

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“…Values of log F ( T ) increase with increasing relative crystallinity, indicating that the required cooling rate should be higher in order to obtain a higher degree of crystallinity at unit crystallization time. Considering the effect of the SiO 2 NPs on the value of log F ( T ), the inclusion of the SiO 2 NPs lowers the value of log F ( T ), as compared with PEO, which is in accordance with a previous report . For the surface‐modified SiO 2 /PEO nanocomposites, those with anionic (C‐SiO 2 ) and cationic (A‐SiO 2 ) surface functionalities have higher values of log F ( T ), compared to those of nanocomposites with the unmodified SiO 2 NPs (Table ).…”

Section: Resultssupporting

confidence: 89%

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO₂ nanoparticles

Lee

Hong

Ungar

et al. 2012

Polymer International

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The crystallization of poly(ethylene oxide) (PEO) in the presence of silica nanoparticles (SiO2 NPs) was investigated in terms of heterogeneous nucleation of SiO2 NPs using polarizing optical microscopy and differential scanning calorimetry. The content and surface functionality of SiO2 NPs were considered as the main factors affecting crystallization, and the effect of annealing time and temperature was also examined. The SiO2 NPs acted as heterogeneous nucleates during the crystallization process, thereby enhancing the nucleation density and limiting the spherulitic growth rate. A kinetics study of non‐isothermal crystallization showed that the crystallization rate of 5 wt% SiO2/PEO nanocomposite was ca 2.1 times higher than that of neat PEO. In addition, among various surface‐functionalized SiO2 nanoparticles, alkyl‐chain‐functionalized SiO2 NPs were favorable for achieving a higher crystallization rate due to the enhanced compatibility between the SiO2 NPs and PEO chains. © 2012 Society of Chemical Industry

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Section: Resultssupporting

confidence: 89%

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO₂ nanoparticles

Lee

Hong

Ungar

et al. 2012

Polymer International

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“…Hence, the lower crystallization temperature would be accompanied by lower n value as per Table . Similar type of observations have also been made earlier for crystallization of poly(ethylene2, 6‐naphthalate) induced by modified CNT and alumina particle filled polyether ether ketone .The variation of n values of nanocomposites with MWCNTs concentration is ascribed to the complicated crystallization mechanism and heterogeneous nucleation of SPU in presence of MWCNTs . As shown in Table for all the samples the values of Z c increase with increasing cooling rate from 5°C/min to 20°C/min.…”

Section: Resultssupporting

confidence: 83%

Nonisothermal crystallization kinetics of carbon nanotubes containing segmented polyurethane elastomer

Gupta

Bhave

Chakraborty

et al. 2016

Polymer Engineering & Sci

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Nanocomposites of the segmented polyurethane (SPU) elastomer with different concentrations of multiwall carbon nanotubes (MWCNTs) have been prepared. Scanning electron microscopy has been used to visualize the surface morphology and distribution of the nanotubes inside the matrix. Differential scanning calorimetry has been utilized to investigate the effects of MWCNTs on the crystallization characteristics of the SPU by collecting data at four cooling rates namely 5, 10, 15, and 20°C/min in the temperature range between 200°C to ambient. The results reveal that MWCNTs act as effective nucleating agent for crystallization of the hard segment of SPU and advance the onset and peak temperatures of crystallization by 38 and 23°C, respectively. The associated enthalpy and extent of crystallization are also increased by 34%. Different crystallization kinetic parameters have been calculated using both modified Avrami and combined Ozawa‐Avrami models to suggest a three dimensional growth of crystallization of SPU and its nanocomposites. The activation energy has been calculated using Kissinger method, which indicates that activation energy decreases with increasing concentration of MWCNTs. The calorimetric results have further been correlated with thermomechanical analysis and glass transition temperature of the nanocomposites corresponding to soft segment is found to increase by 20°C. POLYM. ENG. SCI., 56:1248–1258, 2016. © 2016 Society of Plastics Engineers

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“…Poly(dimethylsiloxane) (PDMS) stamps are the mostly used bedrock of standard lamination techniques. [129][130][131][132][133][134]136,137] Successful transfer requires careful control over the relative adhesion between layer and substrate and layer and stamp. In 2008, Yim et al demonstrated a cost-effective and viable lamination approach to the deposition and patterning of uniform largearea active conjugated polymer thin films (Figure 7).…”

Section: Stamping/lamination and Nano Imprintingmentioning

confidence: 99%

Layer‐by‐Layer Processed Organic Solar Cells

Wang

Zhan

2016

Advanced Energy Materials

102

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Layer‐by‐layer (LL) processes, i.e., sequential deposition of different active layers, are widely used in the fabrication of organic solar cells (OSCs). Recently, LL vacuum deposition and LL solution processes have attracted considerable attention. LL processing presents some advantages over the blend method: a) donor and acceptor layers can be easily and independently controlled and optimized; b) the charge carriers dissociated from excitons at the donor–acceptor interface are confined to each phase, so bimolecular recombination losses can be reduced; c) bilayer geometries enable an easier way for understanding the physical processes taking place at the donor–acceptor interface; d) desired vertical phase separation for charge extraction can be obtained through changing the sequence of donor and acceptor deposition. This report summarizes the recent developments of LL processed OSCs. The remaining problems and challenges, and the key research direction in near future are discussed.

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Efficient organic optoelectronics with multilayer structures

Cited by 17 publications

References 33 publications

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO₂ nanoparticles

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO₂ nanoparticles

Nonisothermal crystallization kinetics of carbon nanotubes containing segmented polyurethane elastomer

Layer‐by‐Layer Processed Organic Solar Cells

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Efficient organic optoelectronics with multilayer structures

Cited by 17 publications

References 33 publications

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO2 nanoparticles

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO2 nanoparticles

Nonisothermal crystallization kinetics of carbon nanotubes containing segmented polyurethane elastomer

Layer‐by‐Layer Processed Organic Solar Cells

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Product

Resources

About

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO₂ nanoparticles

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO₂ nanoparticles