Abstract
If a semiconductor contains two generation–recombination centres, A and B, the noise spectrum either is the simple addition of the two characteristic A and B spectra, or a Lorentzian spectrum with a relaxation time t given by t-1=tA-1+tB-1. The latter situation is called mixing. We can derive the mathematical criterion that decides whether addition or mixing occurs: Addition if na*,nb*. Mixing if na*,nb*. The number n is the number of free electrons in the conduction band. The number a* either is a, the number of occupied A states, or the number of empty states, (A–a), depending on which is smaller. A qualitative physical interpretation is given of the precise mathematical condition.
Original language | English |
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Pages (from-to) | 238-249 |
Number of pages | 12 |
Journal | Physica B: Condensed Matter |
Volume | 31 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - 2002 |