Organic Nanowire Fabrication and Device Applications

Min, Sung‐Yong; Kim, Tae-Sik; Lee, Yeongjun; Cho, Himchan; Xu, Wentao; Lee, Tae‐Woo

doi:10.1002/smll.201401487

Cited by 106 publications

(67 citation statements)

References 163 publications

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“…Organic nanomaterials have been widely used in the fabrication of electronic devices over the last few decades, such as organic field-effect transistors (OFET) [1], organic photovoltaics (OPV) [2] and sensors [3]. These extensive application prospects require a proper understanding of the effect of fundamental aspects in crystal structure, such as molecular packing motifs and molecular orbital overlap, on the performance of organic electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Controllable Molecular Packing Motif and Overlap Type in Organic Nanomaterials for Advanced Optical Properties

Zou

Wang

et al. 2018

Crystals

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Abstract:The optical properties of organic materials are very sensitive to subtle structural modification, and a proper understanding of the structure-property relationship is essential to improve the performance of organic electronic devices. The phase transitions of the η-CuPc to the α-CuPc, then to the β-CuPc were investigated using In situ X-ray diffraction and the differential scanning calorimetry (DSC). The five stages in the phase-transition process from low to high-temperature were observed, which consisted of (1) the η-CuPc; (2) a mixture of the η-and α-CuPc; (3) a mixture of the η-, α-and β-CuPc; (4) a mixture of the α-and β-CuPc; and (5) the β-CuPc. The vibrational and optical properties at different phase-transition stages were correlated to molecular packing motif and molecule overlap type through systematic analyses of the Fourier-transform infrared, Raman and UV-VIS spectra. Moreover, the mechanism for the morphology evolution was also discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Controllable Molecular Packing Motif and Overlap Type in Organic Nanomaterials for Advanced Optical Properties

Zou

Wang

et al. 2018

Crystals

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“…Organic optoelectronic materials have attracted significant recent attention due to their relatively low production cost, abundance, simple processing techniques, and compatibility with flexible technologies, such as printed electronics 1,2 , or wearable photovoltaics 3 . In particular, organic materials based on small molecules have shown great promise for optoelectronic applications, exhibiting high electron mobilities [4][5][6][7][8] and novel excited-state phenomena such as singlet fission [9][10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Ab initiophonon dispersion in crystalline naphthalene using van der Waals density functionals

2016

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Acene molecular crystals are of current interest in organic optoelectronics, both as active materials and for exploring and understanding new phenomena. Phonon scattering can be an important facilitator and dissipation mechanism in charge separation and carrier transport processes. Here, we carry out density functional theory (DFT) calculations of the structure and the full phonon dispersion of crystalline naphthalene, a well-characterized acene crystal for which detailed neutron diffraction measurements, as well as infrared and Raman spectroscopy, are available. We evaluate the performance, relative to experiments, of the local density approximation (LDA); the generalized gradient approximation of Perdew, Burke, and Ernzerhof (PBE); and a recent van der Waalscorrected non-local correlation functional (vdW-DF-cx). We find that the vdW-DF-cx functional accurately predicts lattice parameters of naphthalene within 1%. Intermolecular and intramolecular phonon frequencies across the Brillouin zone are reproduced within 7.8% and 1%, respectively. As expected, LDA (PBE) underestimates (overestimates) the lattice parameters and overestimates (underestimates) phonon frequencies, demonstrating their shortcomings for predictive calculations of weakly-bound materials. Additionally, if the unit cell is fixed to the experimental lattice parameters, PBE is shown to lead to improved phonon frequencies. Our study provides a detailed understanding of the phonon spectrum of naphthalene, and highlights the importance of including van der Waals dispersion interactions in predictive calculations of lattice parameters and phonon frequencies of molecular crystals and related organic materials.

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“…For example, anisotropy of organic nanowires (ONWs) facilitates the propagation of light and electricity in specific spatial directions [117]. The π-π conjugated morphology [118,119] of ONWs [120] coupled with established charge transport according to the molecular packing orientation [121,122] provides favorable emergent properties for electronic devices and highly efficient energy harvesting devices with extremely high aspect ratio and large surface area-to-volume ratio [123][124][125]. Solid, 1D organic nanorods (ONRs) with moderate aspect ratio and high surface area have provided good performance for supercapacitor electrodes [86] and greatly improved photostability for biological imaging applications [126].…”

Section: Organic 1d Semiconductor Systemsmentioning

confidence: 99%

Electrospinning for nano- to mesoscale photonic structures

et al. 2016

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Abstract:The fabrication of photonic and electronic structures and devices has directed the manufacturing industry for the last 50 years. Currently, the majority of small-scale photonic devices are created by traditional microfabrication techniques that create features by processes such as lithography and electron or ion beam direct writing. Microfabrication techniques are often expensive and slow. In contrast, the use of electrospinning (ES) in the fabrication of microand nano-scale devices for the manipulation of photons and electrons provides a relatively simple and economic viable alternative. ES involves the delivery of a polymer solution to a capillary held at a high voltage relative to the fiber deposition surface. Electrostatic force developed between the collection plate and the polymer promotes fiber deposition onto the collection plate. Issues with ES fabrication exist primarily due to an instability region that exists between the capillary and collection plate and is characterized by chaotic motion of the depositing polymer fiber. Material limitations to ES also exist; not all polymers of interest are amenable to the ES process due to process dependencies on molecular weight and chain entanglement or incompatibility with other polymers and overall process compatibility. Passive and active electronic and photonic fibers fabricated through the ES have great potential for use in light generation and collection in optical and electronic structures/ devices. ES produces fiber devices that can be combined with inorganic, metallic, biological, or organic materials for novel device design. Synergistic material selection and postprocessing techniques are also utilized for broad-ranging applications of organic nanofibers that span from biological to electronic, photovoltaic, or photonic. As the ability to electrospin optically and/or electronically active materials in a controlled manner continues to improve, the complexity and diversity of devices fabricated from this process can be expected to grow rapidly and provide an alternative to traditional resource-intensive fabrication techniques.

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Organic Nanowire Fabrication and Device Applications

Cited by 106 publications

References 163 publications

Controllable Molecular Packing Motif and Overlap Type in Organic Nanomaterials for Advanced Optical Properties

Controllable Molecular Packing Motif and Overlap Type in Organic Nanomaterials for Advanced Optical Properties

Ab initiophonon dispersion in crystalline naphthalene using van der Waals density functionals

Electrospinning for nano- to mesoscale photonic structures

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