1. Additional Materials

2. Crystal Growth (Making of a single crystal) Q: What is single crystal? A:Single crystal: All the basic units (atoms/molecules) are arranged in a uniform manner throughout the material. Q: How a single crystal can be formed? A: Two ways: 1. Natural crystal: e.g. Dimond, Jade, Ruby etc… They are formed by millions of years under the earth pressure and temperature. 2. Man made crystal: Silicon (Si), Germanium (Ge) and many other technologically important materials as well as engineered quantum structures and devices. Making of such man-made crystal is called crystal growth. Crystal can be formed by condensing liquid or gas phases of the materials.

3. Some Crystal Growth Techniques There are many crystal growth techniques. Here are a few widely used techniques; CVT:Chemical Vapor Transport (basic technique used in labs) MBE: Molecular Beam Epitaxy (fine quantum structures can be formed and mainly used in the labs) MOCVD: Metallo Organic Chemical Vapor Deposition

4. Crystal Growth (CVT)

5. ZnTe Crystal

6. ZnS

8. Electron Diffraction Spots ZnS

9. Electron Diffraction ZnTe

10. ZnTe X-Ray Diffraction