Question
How do the interactions between the substrate and adsorbate atoms determine the growth mode of thin films? Describe the various modes of thin film growth.
Answer :
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The interactions between the substrate and adsorbate atoms are critical in determining the growth mode of thin films. These interactions involve the balance between the adsorbate-adsorbate bonding energy and the adsorbate-substrate bonding energy. If the adsorbate atoms have a stronger attraction to the substrate than to each other, they tend to spread out over the surface, leading to layer-by-layer growth. Conversely, if the adsorbate atoms bond more strongly with each other than with the substrate, they prefer to cluster together, forming islands or three-dimensional structures. When these energies are comparable, an intermediate growth mode can occur. There are three primary modes
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