Confinement-induced enhancement of hole mobility in MEH-PPV

Cannon, Joseph P.; Bearden, Steven D.; Khatkhatay, Fauzia; Cook, Joseph; Selmic, Sandra; Gold, Scott A.

doi:10.1016/j.synthmet.2009.05.035

Cited by 10 publications

(13 citation statements)

References 35 publications

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“…The scaling is then probably due to confinement, meaning that the microstructure of micromolded PFO gets more ordered with decreasing feature size. This explanation is supported by a similar enhancement of the hole mobility in MEH‐PPV and P3HT due to confinement. PFO is polymorph as it exhibits a dominant glassy α‐phase and crystalline β‐phase .…”

Section: Resultssupporting

confidence: 55%

Downscaling and Charge Transport in Nanostructured Ferroelectric Memory Diodes Fabricated by Solution Micromolding

Lenz

Ghittorelli

Benneckendorf

et al. 2016

Adv Funct Materials

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Ferroelectric polymer memory diodes are interface devices where charge injection into the organic semiconductor is controlled by the stray electric field of the ferroelectric polymer. Key to high current density and current modulation is the areal density of well-defined interfaces. Here, bistable diodes are fabricated by using the soft lithography method solution micromolding. First, the semiconducting polymer poly(9,9-dioctylfluorene) is patterned into linear gratings. Subsequently, bilinear arrays are obtained by backfilling with the ferroelectric polymer poly(vinylidenefluoride-co-trifluoroethylene). The lateral feature size is scaled down from 2 mu m to 500 nm. Comprising memory diodes show rectifying J-V characteristics with an On-current density larger than 10(3) A m(-2) and an On/Off current ratio exceeding 10(3). The charge transport is explained by 2D numerical simulations. Since the dependence of polarization on electric field is explicitly taken into account, entire J-V characteristics can be quantitatively described. The simulations reveal that rectifying J-V characteristics are inherently related to the concave shape of the patterned ferroelectric polymer. It is argued that the exponential increase in current density with decreasing feature size can be due to confinement of the semiconductor. High On-current density combined with downscaling, rectification, and simple fabrication yield new opportunities for low-cost integration of high-density solution-processed memories

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Section: Resultssupporting

confidence: 55%

Downscaling and Charge Transport in Nanostructured Ferroelectric Memory Diodes Fabricated by Solution Micromolding

Lenz

Ghittorelli

Benneckendorf

et al. 2016

Adv Funct Materials

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“…FF so indicates the power conversion efficiency of the cell. For instance, MEH-PPV nanotubules of 200 nm and 100 nm show FF = 59% and FF = 67%, respectively, which are significantly higher that values measured by MEH-PPV thin films (20-30%) [8]. The fill factor is especially relevant for assessing the performances of solar cells, which have to collect sunlight in order to generate electricity.…”

Section: Photodetectors and Photovoltaicsmentioning

confidence: 95%

“…Similarly, active Published in Progress in Polymer Science 43, 48-95, doi: 10.1016/j.progpolymsci.2014.10.001 (2015). 8 compounds can be used in nanofibers which are suitably pumped to amplify light passing through them, thus showing optical gain, which is the case of organic nanofiber lasers (Sec. 4.1).…”

Section: Requirements Of Polymer Nanofibers For Opto-and Nano-electromentioning

confidence: 99%

“…Consequently, these technologies have been proven to be quite versatile, and they have allowed a wide range of polymer nanofibers to be obtained and handled. In the last decade, hard template-based nanofabrication has been applied to realize nanofibers or nanotubes by PPV [23-25], MEH-PPV [8], PVK [95,179], poly[(9,9dioctylfluorenyl-2,7-diyl)-co-(bithiophene)] (F8T2) [52], PFO [53][54][55][56][57][58][59], PPY [180,181] PEDOT [182][183][184] polythiophenes [42,185], and other polymers, copolymers, and nanocomposites [186][187][188]. In this framework, coupling conjugated polymers with metals (Ni, Au, etc.)…”

Section: Templatesmentioning

confidence: 99%

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Active polymer nanofibers for photonics, electronics, energy generation and micromechanics

Persano

Camposeo

Pisignano

2015

Progress in Polymer Science

157

109

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Keyword: polylactic acid, electrospinning method, thermal stimulated current, piezoelectric-like effect 1. Introduction Polylactic acid (PLA) is a biodegradable thermoplastic polyester that may be derived from renewable resources. In our previous study, PLA fiber was used in order to fabricate a film actuator. A notable feature of PLA is its biodegradability [1] , although it is also well known that PLA exhibits piezo-electric-like properties. Because of the fact that a lactide monomer exhibits chirality, two types of optical isomer exist, L-lactide and D-lactide. PLAs that polymerize to form either poly-L-lactide (PLLA) or poly-D-lactide (PDLA) also exhibit chirality. It is commonly known that using stretching to orient PLLA and PDLA films results in a shear piezoelectric effect [2-6]. On the other hand, PLA containing D-and L-lactide, i.e., poly(DL-lactic acid) (PDLLA) as racemic mixture, does not exhibit piezoelectricity. We previously reported on the actuation behavior of a randomly oriented electrospun fibrous PDLLA film [7]. This film exhibited an inverse piezoelectric-like behavior, despite its non-piezoelectric, racemic PDLLA content. Fibrous PDLLA films were prepared using the electrospinning method [8,9] , which is a simple method for preparing polymer nanofibers. The fibers that are ejected from a

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“…In this respect, template methods might be more effective. These techniques have been applied to a large number of systems including NFs or nanotubes made of PPV, poly[2‐methoxy‐5‐(2‐ethylhexyloxy)‐1,4‐phenylenevinylene] (MEH‐PPV, Figure j), PVK, PFO, polypyrrole, poly(3,4‐ethylenedioxythiophene), and polythiophenes . Two different approaches can be followed.…”

Section: Fabrication Technologies For Light‐emitting Nws and Nfsmentioning

confidence: 99%

Laser Systems and Networks with Organic Nanowires and Nanofibers

Matino

Persano

Camposeo

et al. 2019

Advanced Optical Materials

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The potentialities of miniaturized laser sources are still far from being fully developed. Unprecedented opportunities are generated in this field by organic nanowires and nanofibers, which can be used as building blocks of micro‐ and nanolasers in which they combine optical gain, waveguiding, and very high versatility to create nanophotonic networks. The progress in laser devices and network architectures based on optically pumped organic light‐emitting nanowires and nanofibers is here presented, with emphasis on developed active materials, fabrication technologies, lasing mechanisms, and cavity geometries, and on achieved device performance in terms of spectral tunability, excitation threshold, and resonator quality factors. Recent examples of optical coupling of different miniaturized lasers, of their application in optical sensing, and of network lasers are presented. Future directions for research are also outlined, which include the exploration of new classes of active organic or hybrid materials within nanowires, the more in‐depth characterization of the fundamental properties of these lasers, and the use of topologically defined organic nanophotonics in network science, computing, and diagnostics.

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Confinement-induced enhancement of hole mobility in MEH-PPV

Cited by 10 publications

References 35 publications

Downscaling and Charge Transport in Nanostructured Ferroelectric Memory Diodes Fabricated by Solution Micromolding

Downscaling and Charge Transport in Nanostructured Ferroelectric Memory Diodes Fabricated by Solution Micromolding

Active polymer nanofibers for photonics, electronics, energy generation and micromechanics

Laser Systems and Networks with Organic Nanowires and Nanofibers

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