Nabila khan-1.pptx........................

Ppt physics

1. Nabila Imtiaz S24BPHYS3W02023 Dr Faisal Mukhtar

2. TOPIC Direct and I ndirect R ecombination of Electron and Holes

3. Recombination When the electron in the conduction band surpasses the energy gap and reaches the valence band, it becomes stable and occupies the position of a hole in the valence band . Direct recombination Indirect recombination

4. Direct Recombination

5. Continue…. Emitted as a photon, Recombination is radiative , Gallium arsenide,

6. Indirect Recombination

7. Continue…. Involves the trapping of an electron or holes followed by re-emission into the valance and conduction band. Silicon germinium

8. Application of Direct and I ndirect Recombination Laser LEDs light generation Transmission Modulation