An exciton is a bound state of an electron and a hole in a semiconductor material. It is formed when an electron is excited from its ground state to a higher energy level, leaving behind a positively charged hole in its place.
An exciton is created when an electron is excited by absorbing energy from a photon or another electron. This results in the electron moving to a higher energy level and leaving behind a hole in the original energy level.
Excitons play a crucial role in the optical and electronic properties of semiconductors. They are responsible for the absorption and emission of light, as well as for the transport of charge in these materials.
Yes, excitons can be manipulated and controlled through the application of external electric or magnetic fields. This can alter the energy levels of the electron and hole, affecting the properties of the exciton.
In solar cells, excitons are formed when light is absorbed by the semiconductor material. These excitons then undergo a series of processes that eventually result in the generation of an electric current. Therefore, excitons play a crucial role in the conversion of light energy into electrical energy in solar cells.