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Optical Processes in Semiconductors: Review

Optical Processes in Semiconductors: Review. A. Aydınlı. PL. Emission of optical radiation resulting from excitation to a nonequilibrium state by irradiation with light. Create electron-hole pairs by absorption of exciting light Radiative recombination of electron-hole pairs

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Optical Processes in Semiconductors: Review

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  1. Optical Processes in Semiconductors: Review A. Aydınlı

  2. PL • Emission of optical radiation resulting from excitation to a nonequilibrium state by irradiation with light. • Create electron-hole pairs by absorption of exciting light • Radiative recombination of electron-hole pairs • Escape of recombination radiation from the sample.

  3. PL • Sensitive (compared to absorption) • Nondestructive • Simple to perform • Considerable analysis may be required to reach the physical mechanism

  4. Electron-Photon Interaction • Solve: • To obtain:

  5. Fermi’s Golden Rule • Interaction energy between the radiation field and atomic system can be written either

  6. Absorption/Emission

  7. DOS

  8. Transitions in Bulk

  9. Emission vs Gain

  10. Direct Gap Absorption

  11. Direct Gap Absorption

  12. Absorption in QW

  13. Population Inversion in a QW

  14. Intersubband Absorption

  15. Intersubband Absorption

  16. Inter- and intraimpurity Transitions

  17. Free-bound:

  18. Band-band:

  19. Degeneracy:

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