Koushik Deka Msc4 Presentation1 thin film.pptx
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Thin films are layers of material that range from fractions of a nanometer to several micrometers thick. Thin films can appear different colors due to thin film interference, which results from the interference of light waves reflected from the top and bottom surfaces of the thin film layer. Thin films have properties that depend on their thickness and structure, and they can be deposited using physical or chemical vapor deposition techniques. Applications of thin films include optical coatings, decorating coatings, corrosion prevention, thin film solar cells, thin film batteries, and electrical devices.
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- 1. THIN FILMS Presented by KOUSHIK DEKA B Ed 1st Sem Roll no. 16 Namrup College of Teachers Education
- 2. A thin film is a layer of material varies from fractions of a nanometer (monolayer) to several micrometers in thickness Examples: household mirror, soap bubble, oil film, CD etc. Fig : soap bubble Fig : Thin oil film
- 3. Thin Film Interference : A clear and colorless substance can appear to give an array of colors when it is found in a very thin film Fig : Thin film interference in soap bubble Fig : wings of butterfly acting as thin film Fig : light incident on oil film on water
- 4. “A thin film interference results in different array of colors.” This is due to interference of light waves reflected from top and bottom surfaces. Since each color has different wavelength , different angle of incidence and different thickness of thin film layer. It creates a rainbow like effect
- 5. Classification of thin films : Based on structure: Amorphous Single crystal Polycrystalline Based on thickness: • Thicker films ( > 1000 Å) • Thin films (100-1000 Å) • Ultra thin films (50-100 Å)
- 6. Properties of thin films Thin films may be • Not fully dense • Two-dimensional (very thin) • High surface to volume ratio • Very compact • Highly dependent on thickness • Different from bulk materials
- 7. Difference between bulk and thin films Bulk materials have constant physical properties , regardless of size, physical and chemical properties Bulk materials are larger in size Chemically less reactive Thin films have higher physical , optical , chemical properties. And they depend on roughness thickness Thin films are made up of nano-size Chemically more reactive Major properties like thermal, optical properties ,conductivity etc. get enhanced when bulk covert in form of thin films Example : gold
- 8. Thin film deposition: The act of creating and applying a thin film to a surface is called thin film deposition. Deposition techniques are mainly classified into 2 categories physical and chemical. (i) Physical vapor deposition: a) vacuum evaporation b) sputtering (ii) Chemical vapor deposition
- 9. Applications: (1) Optical coating: This optical coating reduces reflection of optical surfaces. Example : anti reflection coating on sun glasses (2)Decorating coating: The oldest application of thin films is decorating coating. Thin gold leaves were used in India 5000 years ago. (3) Corrosion prevention: Thin films are used as anti-corrosion protection in jewellery, wrist watches etc.
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