1.Explain what the size of the exciton Bohr radius means for achieving quantum confinement.What systems are easiest for achieving this effect? Explain why?
2.Can ‘excitons’ be seen in the electronic absorption spectrum of bulk semi- conductors? give explanation in support of your answer.
3.True or False? Also give explanations in support of your answer.
4. Once an energy band is formed its width is proportional to the number of atoms in the solid.
5. The band gap of a quantum dot is directly proportional to its size.
6.A quantum dot containing thousands of atoms can be used to trap a single free electron- in effect creating a gignatic, atrificial hydrogen atom.
7.When numerous atoms are brought into close proximity, only the highest occupied energysub-level forms a band.
8.Quantum confinement relates only to those electrons that would otherwise be mobile - theconduction electrons.
explanation in support of your answer.
i answer.
why?