A nonlinear theory of recombination waves in semiconductors is constructed that addresses quasi-neutrality breaking in the electron–hole plasma with fully developed instability. It is established that with increasing applied electric field a recombination wave of uniform amplitude is transformed into a traveling solitary domain; the domain formation manifests itself in the transition from almost sinusoidal to relaxation oscillations of current. A formula is derived that relates the domain velocity to the properties of the material and the current–voltage characteristic of the specimen. The predicted transformation of recombination waves is verified by checking against previously obtained experimental results concerning slow recombination waves in Si specimens with Zn doping compensation. It is found that a calculated field at which relaxation oscillations arise agrees with the measured one. The frequency of relaxation oscillations is examined as a function of applied field on the basis of the theory and the experiment. The calculated characteristic is shown to be in qualitative and quantitative agreement with the measured one.
Russian Microelectronics – Springer Journals
Published: Oct 18, 2004
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