ECE227A_HW2_Solution_merged

ECE227A_HW2_Solution_merged - HOMEWORK 2 SOLUTIONS 6....

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HOMEWORK 2 SOLUTIONS 6. Spontaneous Recombination : An electron in the conduction band recombines spontaneously with a hole in the valence band and generates a photon. Stimulated Recombination : An incoming photon will perturb an electron in the conduction band and it will recombine with a hole in the valence band, emitting another photon; the incoming photon is not destroyed in this process. This leads to multiplication of photons and lasing. Stimulated Generation : A photon is absorbed and the energy from the photon stimulates an electron in the valence band to jump to the conduction band, leaving behind a hole in the valence band. Nonradiative Recombination : Recombination of an electron and hole in a way such that no photon is emitted; rather the energy from recombination dissipates in the form of heat into the crystal lattice. This can occur through the presence of traps or Auger recombination 7. One way through which non-radiative recombination can occur is through nonradiative recombination centers such as point defects, surfaces and interfaces. These do not require the simulatenous existence of electrons and holes, since an
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ECE227A_HW2_Solution_merged - HOMEWORK 2 SOLUTIONS 6....

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