Growth of Ag thin films on ZnO(0 0 0 −1) investigated by AES and STM

Duriau, Edouard; Agouram, Saïd; Morhain, C.; Seldrum, Thomas; Sporken, R.; Dumont, Jacques

doi:10.1016/j.apsusc.2005.12.119

Cited by 13 publications

(11 citation statements)

References 15 publications

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“…The formation of islands during Ag thin film growth on ZnO has been witnessed experimentally [4] and investigated via ab initio methods [5]. Further investigation is conducted by using a lattice based adaptive kinetic Monte Carlo (LatAKMC) model to simulate initial growth phases of Ag on a perfect O-terminated ZnO (0001) surface.…”

Section: Introductionmentioning

confidence: 99%

Critical island size for Ag thin film growth on ZnO (0 0 01¯)

Lloyd

Smith

Kenny

2017

Nuclear Instruments and Methods in Physics Research Section B:

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Island growth of Ag on ZnO is investigated with the development of a new technique to approximate critical island sizes. Ag is shown to attach in one of three highly symmetric sites on the ZnO surface or initial monolayers of grown Ag. Due to this, a lattice based adaptive kinetic Monte Carlo (LatAKMC) method is used to investigate initial growth phases. As island formation is commonly reported in the literature, the critical island sizes of Ag islands on a perfect polar ZnO surface and a first monolayer of grown Ag on the ZnO surface are considered. A mean rate approach is used to calculate the average time for an Ag ad-atom to drop off an island and this is then compared to deposition rates on the same island. Results suggest that Ag on ZnO (0001) will exhibit Stranski-Krastanov (layer plus island) growth.

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Section: Introductionmentioning

confidence: 99%

Critical island size for Ag thin film growth on ZnO (0 0 01¯)

Lloyd

Smith

Kenny

2017

Nuclear Instruments and Methods in Physics Research Section B:

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“…However, experimental results 4 suggest that Ag grows in islands when deposited at low energies rather than uniform, flat layers. It has also been known for some time that the interface between Ag and ZnO is one of the weakest in a multilayer stack, and this has been the subject of previous investigations by a number of authors, see for example Refs.…”

Section: Introductionmentioning

confidence: 87%

“…In experiments, island growth of Ag on ZnO has been observed 4 when Ag has been deposited at low energies via evaporation and once a few nanometres have grown. However, little is known about the formation of islands and growth mechanisms experimentally for the initial one or two layers of growth.…”

Section: E Lat-akmc Simulations On a Perfect Zno(0001) Surfacementioning

confidence: 99%

Growth of silver on zinc oxide via lattice and off-lattice adaptive kinetic Monte Carlo

2018

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The growth of Ag on ZnO was modeled using a reactive force field potential and a combination of molecular dynamics and adaptive kinetic Monte Carlo (AKMC) simulations. An adaptive lattice-based AKMC model is described as a method of extending timescales and length scales that can be simulated. Reusing previously found transitions to reduce computational time is discussed for both the lattice and off-lattice AKMC approaches. With these methods, growth of over 1 monolayer's worth of Ag is simulated corresponding to a real deposition time of up to 0.1 s. The results show that the deposited silver aggregates on the surface through mainly single atom moves with few concerted motions. Initially silver adatoms do not agglomerate and the energy barriers for silver dimers to form are larger than for them to break apart. The first layer of silver grows as a series of connected regions rather than forming well-defined centro-symmetric islands.

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“…Other interfaces involve Ag on Ti and Ti on Ag. In the case of Ag on ZnO, some experimental data exist 24 but as far as we are aware, none exist for the other interfaces. In these systems, the growth mechanisms are unknown, so a methodology that can explain the growth processes can help determine the deposition conditions that produce the best quality films.…”

Section: The Need For Pathway Determination In Thin Film Growthmentioning

confidence: 99%

“…26 Ag growth on ZnO surfaces has been the subject of several investigations that indicate that Ag grows in islands rather than smooth layers. 24,25 In our simulations, atoms are deposited with an energy of 3 eV normal to the surface at 300 K and AKMC is compared with MD. In this case, there are very few concerted motions during growth.…”

Section: The Need For Pathway Determination In Thin Film Growthmentioning

confidence: 99%

Reaction pathways in atomistic models of thin film growth

Lloyd

Zhou

et al. 2017

The Journal of Chemical Physics

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The atomistic processes that form the basis of thin film growth often involve complex multi-atom movements of atoms or groups of atoms on or close to the surface of a substrate. These transitions and their pathways are often difficult to predict in advance. By using an adaptive kinetic Monte Carlo (AKMC) approach, many complex mechanisms can be identified so that the growth processes can be understood and ultimately controlled. Here the AKMC technique is briefly described along with some special adaptions that can speed up the simulations when, for example, the transition barriers are small. Examples are given of such complex processes that occur in different material systems especially for the growth of metals and metallic oxides.

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Growth of Ag thin films on ZnO(0 0 0 −1) investigated by AES and STM

Cited by 13 publications

References 15 publications

Critical island size for Ag thin film growth on ZnO (0 0 01¯)

Critical island size for Ag thin film growth on ZnO (0 0 01¯)

Growth of silver on zinc oxide via lattice and off-lattice adaptive kinetic Monte Carlo

Reaction pathways in atomistic models of thin film growth

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