A Tunnel Current in Self‐Assembled Monolayers of 3‐Mercaptopropyltrimethoxysilane

Aswal, D. K.; Lenfant, S.; Guérin, David; Yakhmi, J. V.; Vuillaume, D.

doi:10.1002/smll.200500052

Cited by 62 publications

(70 citation statements)

References 24 publications

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“…The root-mean-square (rms) roughness of ITO glass derivatized with FPS measured using an Atomic Force Microscope (AFM) was identical to that of untreated ITO ( ∼ 3.5 nm), evidence that polymerization of FPS does not occur to any signifi cant extent using the vapor phase deposition method. This conclusion is in agreement with Aswal et al [ 34 ] and Stec et al [ 35 ] who used vapor phase deposition of trimethoxysilane nanolayers to immobilize incident Au atoms on silicon and glass substrates respectively, and is corroborated by the absence of ion fragments in the ule-SIMS spectra assigned to Si-O-Si linkages. Figure 1 (b) also shows evolution of the ϕ of UV/O 3 treated ITO glass as a function of time exposed to CPS vapor, from which it is evident that the optimal exposure time is also > 20 hrs and the ϕ of CPS derivatized ITO glass saturates at ∼ 5.25 eV.…”

Section: Electrode Fabrication and Characterizationsupporting

confidence: 86%

An Electrode Design Rule for Organic Photovoltaics Elucidated Using Molecular Nanolayers

Cook

Pegg

Kinnear

et al. 2011

Advanced Energy Materials

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Silane nanolayers deposited from the vapor phase onto indium‐tin oxide (ITO) coated glass are shown to be an effective means of tuning the work function and stabilizing the surface of this complex ternary oxide. Using this approach a pair of model hole‐extracting electrodes have been developed to investigate how the performance of bi‐layer organic photovoltaics is impacted by built‐in positive space charge in the critical region close to the hole‐extracting electrode. The magnitude and spatial distribution of positive space charge resulting from ground‐state electron transfer from the donor layer to the ITO electrode upon contact formation, is derived from direct measurements of the interfacial energetics using the Kelvin probe technique. This judiciously designed experiment shows that it is unnecessary to engineer the work function of the hole‐extracting electrode to match the ionization potential of the donor layer, rather only to ensure that the former exceeds the latter, thus simplifying an important aspect of device design. In addition, it is shown that silane nanolayers at the ITO electrode surface are remarkably effective at retarding device degradation under continuous illumination.

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Section: Electrode Fabrication and Characterizationsupporting

confidence: 86%

An Electrode Design Rule for Organic Photovoltaics Elucidated Using Molecular Nanolayers

Cook

Pegg

Kinnear

et al. 2011

Advanced Energy Materials

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“…With ellipsometry, the monolayer thickness has been determined as 0.8 0.1 nm with a roughness of 0.14 nm. 25 Our atomic force microscopy ͑AFM͒ measurements show a thickness of 6 nm with a roughness of 0.16 nm.…”

Section: Self-assembled Monolayer Preparationmentioning

confidence: 99%

Control of surface plasmon resonances in dielectrically coated proximate gold nanoparticles immobilized on a substrate

Rooney

Rezaee

et al. 2008

Phys. Rev. B

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Rooney, P.; Rezaee, A.;Xu, S.; Manifar, T.; and Rangan, Chitra. (2008 We present experimental and theoretical results for the changes in the optical-plasmon resonance of goldnanoparticle dimers immobilized on a surface when coated with an organic dielectric material. The plasmon band of a nanoparticle dimer shifts to a higher wavelength when the distance between neighboring particles is decreased, and a well-separated second peak appears. This phenomenon is called cross-talk. We find that an organic coating lets cross-talk start at larger separation distances than for uncoated dimers by bridging the gap between immobilized nanoparticles ͑creating optical clusters͒. We study this optical clustering effect as a function of the polarization of the applied light, of the inter-particle distance, of the surrounding environment, and of the optical properties of the coating layer. Theoretical discrete-dipole approximation calculations support the experimental absorption spectroscopy results of gold nanoparticles on glass substrates and on optical waveguides.

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“…They were cut into 13 mm × 13 mm squares and treated in a peroxide-ammonia solution to remove organic contaminations and to activate negative OH-groups on the surface [6]. Then a cationic polyelectrolyte polyethylenimine (PEI) was adsorbed under different conditions as it was described in [7], i.e.…”

Section: Methodsmentioning

confidence: 99%

Electrical characterization of organic monolayers/silicon hybrid structures

Malyar

Lukyanova

Glukhovskoy

et al. 2016

J. Phys.: Conf. Ser.

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Abstract. Hybrid structures consisting of an n-Si substrate covered with a cationic polyethylenimine layer and an anionic dye layer were fabricated. Their electrical properties were characterized using tunnel current measurements by a tungsten probe. The obtained I-V curves were analyzed using a modified diode equation. We found out that adsorption of the cationic polyelectrolyte decreases the barrier height of n-Si/organic monolayer/W structure, while adsorption of the low molecular weight anionic dye increases it. The results demonstrate that along with thermionic mechanism other ones are present which prevail at low voltage. In particular, electron tunneling dominates for a single monolayer on the silicon substrate, while, apparently, the Pool-Frenkel mechanism is typical for two monolayers. IntroductionHybrid structures consisting of organic and inorganic components are a subject of interest in various research fields [1] as they combine well-known and developed inorganic materials with a huge amount of organic ones properties of which can be varied in wide ranges. In particular, such structures based on inorganic semiconductors can be used in microelectronics [2], sensors [3] and photovoltaic applications [4].There are several models describing electron transfer in hybrid structures [2] which defines their electrical properties. Moreover, models of charge transport through organic molecules were also elaborated [5] to estimate electrical properties of hybrid structures with thick organic layers. Therefore, the conduction mechanism for a certain hybrid structure should be considered separately.In the present work we examine the electrical properties of hybrid structures consisting of a silicon substrate covered with a cationic polyelectrolyte monolayer and an anionic dye layer using tunnel current measurements.

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A Tunnel Current in Self‐Assembled Monolayers of 3‐Mercaptopropyltrimethoxysilane

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Cited by 62 publications

References 24 publications

An Electrode Design Rule for Organic Photovoltaics Elucidated Using Molecular Nanolayers

An Electrode Design Rule for Organic Photovoltaics Elucidated Using Molecular Nanolayers

Control of surface plasmon resonances in dielectrically coated proximate gold nanoparticles immobilized on a substrate

Electrical characterization of organic monolayers/silicon hybrid structures

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