Abstract

Using the method of the field of directions, the influence of the boundary conditions on stationary and moving high-field domains in Gunn diodes is analyzed and discussed. A criterion for self-induced instabilities, especially the Gunn oscillations, is given. It is shown that stationary domains must occur preceding the Gunn oscillations, and that such oscillations can only occur for slightly blocking contacts. The analysis given in this paper is similar to the one discussed for field-quenched CdS.

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