Temperature-dependent 2-D to 3-D growth transition of ultra-thin Pt films deposited by PLD

Galinski, Henning; Ryll, Thomas; Reibisch, Philipp; Schlagenhauf, Lukas; Schenker, Iwan; Gauckler, Ludwig J.

doi:10.1016/j.actamat.2013.02.018

Cited by 16 publications

(23 citation statements)

References 33 publications

(29 reference statements)

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“…Investigations concerned the morphology of islands on substrates of different systems and symmetries. These results show the evolution of the grown surface morphology and the diffusion mechanisms on the terrace that control the 1D/2D transition . Previous research has documented that the study of the morphologies of 2D growth nanostructures, is assured by kinetic controlled aggregation islands in epitaxial surface .…”

Section: Introductionmentioning

confidence: 58%

Kinetic Monte Carlo Simulation of Au Monolayer Evolution on Cu(110)

Dardouri

Hassani

Hasnaoui

et al. 2018

Physica Status Solidi (b)

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In this work, results obtained from the kinetic Monte Carlo (KMC) simulations are presented. The KMC is based on embedded‐atom method (EAM) energetics findings. The evolution of the surface morphology in Au/Cu(110) is investigated. All activation barriers are calculated by the EAM method and used in the anisotropic bond‐breaking model (ABBM). In this study, the effects of substrate temperature and deposition rate are taken into account, with the coverage rate equal to 5%. The results show the transition from 1D to 2D in the morphology of the monolayer when the temperature increases. However, when the flux decreases the density of islands increases. During monolayer evolution, many phenomena are observed such as nucleation, coalescence, evolution of island density, and geometry transition.

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Section: Introductionmentioning

confidence: 58%

Kinetic Monte Carlo Simulation of Au Monolayer Evolution on Cu(110)

Dardouri

Hassani

Hasnaoui

et al. 2018

Physica Status Solidi (b)

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“…The topography is typical of the 3D (Volmer–Weber) growth of ultrathin metal films on dielectric substrates,32 and consists of a percolating network of islands separated by irregular channels. The discontinuous morphology is likely favored by the moderate radiative heating (≈60 °C) of the β‐Ga 2 O 3 substrate during deposition, that enhances (liquid‐like) metal clustering 33. The surface heights' range (≈10 nm) fits the Au nominal thickness, hence the channels likely yield to the bare substrate or to an atomically thin wetting layer.…”

Section: Resultsmentioning

confidence: 99%

Benchmarking β‐Ga₂O₃ Schottky Diodes by Nanoscale Ballistic Electron Emission Microscopy

Buzio

Gerbi

et al. 2020

Adv Elect Materials

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Monoclinic beta‐phase gallium oxide (β‐Ga2O3) is an ultrawide‐bandgap semiconductor, intensively studied as a viable candidate for next‐generation power electronics, optoelectronics, and extreme environment electronics. Schottky contacts to β‐Ga2O3 are of paramount importance to this end; however, they are not yet fundamentally understood. Intrinsic sources of interfacial disorder, including oxygen‐related defects and extrinsic fabrication factors, are thought to greatly determine the properties of such contacts, for example by originating Fermi level pinning and causing patches with different Schottky barrier heights (SBHs). Ballistic electron emission microscopy (BEEM) is used to probe band bending and interfacial inhomogeneity at the nanoscale for prototypical Au/ and Pt/(100)β‐Ga2O3 single crystal Schottky barrier diodes. It is shown that SBH fluctuations amount to 40–60 meV under vacuum, occurring over length scales of tens of nanometers. Furthermore, a remarkable SBH modulation of ≈0.2 eV takes place upon exposure of devices from vacuum to ambient air. Such findings—better obtained by BEEM than by macroscale approaches—point to the existence of an ubiquitous inhomogeneous interfacial layer, controlling band bending and ambient sensitivity via oxygen ionosorption and interface redox chemistry. This study ascribes a key role to interfacial oxygen vacancies, and has practical implications for transport modelling and interface engineering.

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“…Several deposition techniques can in principle be used to produce thin Pt films. They vary from electrodeposition, sputtering, e‐beam evaporation, and atomic layer deposition to PLD . PLD is a technique used for the thin films preparation for a variety of materials .…”

Section: Introductionmentioning

confidence: 99%

Tuning the Surface Electrochemistry by Strained Epitaxial Pt Thin Film Model Electrodes Prepared by Pulsed Laser Deposition

Temmel

Fabbri

Pergolesi

et al. 2016

Adv Materials Inter

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toward different reactions such as methanol [ 1 ] or ethanol [ 2,3 ] oxidation, hydrogen oxidation, [ 4 ] and oxygen reduction reaction. [ 5,6 ] However, the slow kinetics of some of these reactions results in great losses concerning the respective energy conversion effi ciencies. This drawback, together with Pt dissolution phenomena requires a large amount of Pt at the electrode. The accompanying cost and scarcity of Pt represent the prime impediments toward a broad practical application of fuel cells. Electrode interface properties play a decisive role in controlling the electrocatalytic performance. [ 7 ] Since Pt-based materials are to date the best electrocatalysts for these reactions, [ 8 ] extensive research has been dedicated to develop novel Pt-based catalyst architectures with a specifi cally tailored electrode-electrolyte interface. In recent years it has been demonstrated that strain on metal surfaces can have a signifi cant impact on the adsorbate's binding energies and on the activation energy barrier for adsorption processes. [ 9 ] In this regard, core-shell nanoparticles (NPs), where an outer monolayer (ML) of Pt is supported on another metal [ 10,11 ] or on Pt-alloy NPs [ 12 ] have been designed. The strain in these systems is generated due to the difference in lattice constant between the outer ML and the core of the NP. When the top ML adapts its crystal lattice to the underlying core lattice, depending on the sign of the lattice misfi t the ensuing stress induces tensile or compressive lattice distortions (strain).In general, surface strain can also be generated by deposition of ultrathin (few ML thick) metal fi lms on substrates. [ 3,[13][14][15] One strategy utilizes the galvanic displacement of an underpotentially deposited (UPD) copper-ML by Pt on various substrates. [ 3,13 ] The strained Pt MLs reveal a substantial increase in activity toward methanol and ethanol electrooxidation. The electrochemical behavior of ultrathin Pt fi lms of varying thickness evaporated on Ru(0001) substrates was also examined by cyclic voltammetry (CV). [ 16 ] It was found that the reversible adsorption of H and OH strongly depends on the Pt thickness and in turn the extent of the strain induced in the Pt surface. Recently, another approach involved growing ultrathin Pt fi lms on W(111) substrates with varying Pt thickness of 2.2, 3.3, and A novel approach for tailoring strained Pt model electrocatalysts using pulsed laser deposition is presented. The physical properties of Pt fi lms grown on single-crystalline (100)-and (111)-oriented strontium titanate depend signifi cantly on the various deposition parameters (e.g., fl uence, temperature, background atmosphere, postannealing, and number of process steps), as revealed by scanning electron microscopy and X-ray studies. By properly selecting the deposition conditions, thin, epitaxial, and strained (100)-and (111)-oriented Pt fi lms suitable as model electrodes can be prepared. Cyclic voltammetry measurements indicate that the strain in the Pt fi lms changes sig...

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Temperature-dependent 2-D to 3-D growth transition of ultra-thin Pt films deposited by PLD

Cited by 16 publications

References 33 publications

Kinetic Monte Carlo Simulation of Au Monolayer Evolution on Cu(110)

Kinetic Monte Carlo Simulation of Au Monolayer Evolution on Cu(110)

Benchmarking β‐Ga₂O₃ Schottky Diodes by Nanoscale Ballistic Electron Emission Microscopy

Tuning the Surface Electrochemistry by Strained Epitaxial Pt Thin Film Model Electrodes Prepared by Pulsed Laser Deposition

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Temperature-dependent 2-D to 3-D growth transition of ultra-thin Pt films deposited by PLD

Cited by 16 publications

References 33 publications

Kinetic Monte Carlo Simulation of Au Monolayer Evolution on Cu(110)

Kinetic Monte Carlo Simulation of Au Monolayer Evolution on Cu(110)

Benchmarking β‐Ga2O3 Schottky Diodes by Nanoscale Ballistic Electron Emission Microscopy

Tuning the Surface Electrochemistry by Strained Epitaxial Pt Thin Film Model Electrodes Prepared by Pulsed Laser Deposition

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Benchmarking β‐Ga₂O₃ Schottky Diodes by Nanoscale Ballistic Electron Emission Microscopy