Question
The process of extension of a single-crystal surface by growing a film in such a way that the added atoms form a continuation of the single-crystal structure is called :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Epitaxy
Epitaxy: Crystal Structure Extension Explained
The process described is known as Epitaxy. It involves growing a thin crystalline film on a crystalline substrate. The key feature is that the crystal structure of the deposited film follows the same crystallographic orientation as the substrate, effectively acting as a continuation of the substrate's crystal lattice.
Analyzing the Options
- Epitaxy: This definition precisely matches the question, describing the growth of a film that continues the underlying single-crystal structure.
- Ion Implantation: This technique involves embedding ions into a material, altering its composition and properties, rather than growing a crystalline layer.
- Chemical Vapor Deposition (CVD): While CVD can be used to perform epitaxy, it is a broader technique for depositing thin films. The question specifically asks for the name of the *process* of structure continuation, which is epitaxy itself.
- Electroplating: This method uses electrochemical processes to deposit a metal coating, typically resulting in polycrystalline or amorphous structures, not a direct crystalline continuation of a substrate.
Therefore, epitaxy is the specific term for extending a single-crystal structure by growing a film layer.
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