Adhesion in organic electronic structures

Tong, T.; Babatope, Babaniyi; Admassie, Shimelis; Meng, Juan; Akwogu, O.; Akande, Wali O.; Soboyejo, Winston O.

doi:10.1063/1.3246786

Cited by 49 publications

(58 citation statements)

References 37 publications

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“…2,27,33,[43][44][45] Prior measurements of adhesion energies are presented Table II and Figure 8. These show that the computed energy release rates (Figure 8) can exceed the measured adhesion energies (Figure 7) obtained in the interfaces that are present in OLED structures.…”

Section: Modeling Of Pull-off As a Fracture Processmentioning

confidence: 99%

Cold welding of organic light emitting diode: Interfacial and contact models

et al. 2016

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This paper presents the results of an analytical and computational study of the contacts and interfacial fracture associated with the cold welding of Organic Light Emitting diodes (OLEDs). The effects of impurities (within the possible interfaces) are explored for contacts and interfacial fracture between layers that are relevant to model OLEDs. The models are used to study the effects of adhesion, pressure, thin film layer thickness and dust particle modulus (between the contacting surfaces) on contact profiles around impurities between cold-welded thin films. The lift-off stage of thin films (during cold welding) is then modeled as an interfacial fracture process. A combination of adhesion and interfacial fracture theories is used to provide new insights for the design of improved contact and interfacial separation during cold welding. The implications of the results are discussed for the design and fabrication of cold welded OLED structures.

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Section: Modeling Of Pull-off As a Fracture Processmentioning

confidence: 99%

Cold welding of organic light emitting diode: Interfacial and contact models

et al. 2016

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“…International collaborations among the United States and Africa, [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] J oint US-Africa Materials Institute (JUAMI) will be held December 10-21, 2018, in Kampala, Uganda. JUAMI features tutorials on cutting-edge energy materials topics, hands-on experiments and learning activities, and research seminars.…”

Section: In Summarymentioning

confidence: 99%

Strengthening diversity and cooperation through international collaborations: A focus on Africa, South America, and the Caribbean

Soboyejo

Madsen

2018

MRS Bull.

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Africa is the second largest continent in terms of size and population.1,2 With approximately 1.256 billion people (about 15% of the world’s population) and a land area of 30.3 million square kilometers (including adjacent islands), it occupies about 20.4% of the earth’s total land area.1 A significant fraction of the people in the Caribbean* and South America are of African descent, and there are many historical and cultural links among the people of these regions.3 South America has 422.5 million people, and the Caribbean has about 39.12 million people;1 hence, the total population of all three areas represents about 20% of the world’s population.1,2 Similarities in climate also mean that common approaches can be explored for establishing sustainable building materials, and the range of development indices offer unique opportunities for collaborations in research and education that can facilitate human development.4

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“…Phase imaging, surface topography and force calibration curves were obtained for the different surfaces by AFM in contact and tapping modes to quantify the physical interaction at the polymer interface using Au-coated cantilever tips. Interaction force response between the sample and cantilever tip [32,55] was measured for each sample. The surface roughness for each surface was recorded and related to adhesion data as measured by the deflection as recorded from the interaction between Au-coated cantilever tip and the polymer surface.…”

Section: B Babatope Et Almentioning

confidence: 99%

“…Also, this type of study could be incorporated into device performance improvement studies in view of recent reported improving power conversion efficiency of conjugated polymer-based solar cells [52], which remains largely unsatisfactory for large-scale commercial production in competition with its amorphous silicon-based devices. There are indications that charge transportation at the interface could be improved by a better understanding of the physical phenomena at the interface [32]. This has brought into the fore, an intensified investigation of the physical interaction between the dissimilar materials in direct contact, which is vital to sustainable device performance.…”

Section: Introductionmentioning

confidence: 99%

“…Investigations of the chemical nature of interfaces are common in thin film characterization, but not much attention has been directed at measuring physical interaction until recently when advanced characterization tools are becoming more widely available. However, in a work reported on the nanoscale adhesion between organic-organic, organic-inorganic, and inorganic-inorganic thin film interfaces [32], the AFM technique was used in quantifying the interfaces, though with some limitations. The pull-off forces and surface parameters were measured and incorporated into theo-retical models for the estimation of surface energies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Switching on Metal-Organic Interface Adhesion Relevant to Organic Electronic Devices

Babatope¹,

Akogwu²,

Adewoye³

et al. 2013

AMPC

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Considerable efforts are currently being devoted to investigation of metal-organic, organic-organic and organic-inorganic interfaces relevant to organic electronic devices such as organic light emitting diode (OLEDs), organic photovoltaic solar cells, organic field effect transistors (OFETs), organic spintronic devices and organic-based Write Once Read Many times (WORM) memory devices on both rigid and flexible substrates in laboratories around the world. The multilayer structure of these devices makes interfaces between dissimilar materials in contact and plays a prominent role in charge transport and injection efficiency which inevitably affect device performance. This paper presents results of an initial study on how switching between voltage thresholds and chemical surface treatment affects adhesion properties of a metal-organic (Au-PEDOT:PSS) contact interface in a WORM device. Contact and Tapping-mode Atomic Force Microscopy (AFM) gave surface topography, phase imaging and interface adhesion properties in addition to SEM/EDX imaging which showed that surface treatment, switching and surface roughness all appeared to be key factors in increasing interface adhesion with implications for increased device performance.

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Adhesion in organic electronic structures

Cited by 49 publications

References 37 publications

Cold welding of organic light emitting diode: Interfacial and contact models

Cold welding of organic light emitting diode: Interfacial and contact models

Strengthening diversity and cooperation through international collaborations: A focus on Africa, South America, and the Caribbean

Effect of Switching on Metal-Organic Interface Adhesion Relevant to Organic Electronic Devices

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