Soft lithography contacts to organics

Hsu, Julia W. P.

doi:10.1016/s1369-7021(05)70986-x

Cited by 29 publications

(21 citation statements)

References 74 publications

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“…The challenges are further exacerbated by the limited adhesion and contact at the interfaces between the layers that are relevant to organic electronics structures. [3][4][5] There is, therefore, a need to engineer new ways of improving charge mobility and adhesion/contact within/ between the layers that are relevant to organic solar cells and organic light emitting devices. There is also a potential for improving charge transport via incorporation of nanoscale titanium dioxide (TiO 2 ) particles into the active layers of organic solar cells and light emitting devices.…”

Section: Introductionmentioning

confidence: 99%

Adhesion in flexible organic and hybrid organic/inorganic light emitting device and solar cells

Oyewole

Kwabi

et al. 2014

Journal of Applied Physics

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This paper presents the results of an experimental study of the adhesion between bi-material pairs that are relevant to organic light emitting devices, hybrid organic/inorganic light emitting devices, organic bulk heterojunction solar cells, and hybrid organic/inorganic solar cells on flexible substrates. Adhesion between the possible bi-material pairs is measured using force microscopy (AFM) techniques. These include: interfaces that are relevant to organic light emitting devices, hybrid organic/inorganic light emitting devices, bulk heterojunction solar cells, and hybrid combinations of titanium dioxide (TiO 2) and poly(3-hexylthiophene). The results of AFM measurements are incorporated into the Derjaguin-Muller-Toporov model for the determination of adhesion energies. The implications of the results are then discussed for the design of robust organic and hybrid organic/inorganic electronic devices. V

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Section: Introductionmentioning

confidence: 99%

Adhesion in flexible organic and hybrid organic/inorganic light emitting device and solar cells

Oyewole

Kwabi

et al. 2014

Journal of Applied Physics

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“…Control over the electronic properties of semiconductors and metals is a central issue for their use in (opto)electronic devices. Modifying a solid's properties by changing its composition (e.g., via doping) is possible only within certain, generally narrow limits due to thermodynamic constraints. , Designing systems with interfaces, whose electrical properties can be varied, provides a significant degree of control over the system's electrical characteristics because electronic transport through devices depends critically on the properties of the interfaces through which electrons pass. − …”

Section: Introductionmentioning

confidence: 99%

Controlling Semiconductor/Metal Junction Barriers by Incomplete, Nonideal Molecular Monolayers

Haick¹,

Ambrico²,

Tung³

et al. 2006

J. Am. Chem. Soc.

110

116

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We study how partial monolayers of molecular dipoles at semiconductor/metal interfaces can affect electrical transport across these interfaces, using a series of molecules with systematically varying dipole moment, adsorbed on n-GaAs, prior to Au or Pd metal contact deposition, by indirect evaporation or as "ready-made" pads. From analyses of the molecularly modified surfaces, we find that molecular coverage is poorer on low- than on high-doped n-GaAs. Electrical charge transport across the resulting interfaces was studied by current-voltage-temperature, internal photoemission, and capacitance-voltage measurements. The data were analyzed and compared with numerical simulations of interfaces that present inhomogeneous barriers for electron transport across them. For high-doped GaAs, we confirm that only the former, molecular dipole-dependent barrier is found. Although no clear molecular effects appear to exist with low-doped n-GaAs, those data are well explained by two coexisting barriers for electron transport, one with clear systematic dependence on molecular dipole (molecule-controlled regions) and a constant one (molecule-free regions, pinholes). This explains why directly observable molecular control over the barrier height is found with high-doped GaAs: there, the monolayer pinholes are small enough for their electronic effect not to be felt (they are "pinched off"). We conclude that molecules can control and tailor electronic devices need not form high-quality monolayers, bind chemically to both electrodes, or form multilayers to achieve complete surface coverage. Furthermore, the problem of stability during electron transport is significantly alleviated with molecular control via partial molecule coverage, as most current flows now between, rather than via, the molecules.

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“…For instance, Au|monolayer|GaAs junctions were produced by nTP with a yield larger than 95% yield. 162,166,167 In contrast, Au|monolayer|Si junctions fabricated by nTP exhibited a yield as low as 20% accompanied by a poor electrical behaviour. 164 Figure 20 Schematic illustration of the nanotransfer printing (nTP) procedure.…”

Section: Figure 17 Schematic Illustration Of Physical Vapour Deposition (Pvd)mentioning

confidence: 99%

Fabrication of metallic and non-metallic top electrodes for large-area molecular junctions

et al. 2021

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Soft lithography contacts to organics

Cited by 29 publications

References 74 publications

Adhesion in flexible organic and hybrid organic/inorganic light emitting device and solar cells

Adhesion in flexible organic and hybrid organic/inorganic light emitting device and solar cells

Controlling Semiconductor/Metal Junction Barriers by Incomplete, Nonideal Molecular Monolayers

Fabrication of metallic and non-metallic top electrodes for large-area molecular junctions

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