Abstract
The incremental admittance of the space-charge-limited dielectric diode is calculated; it is shown that for all frequencies this can be represented as a conductance and susceptance in parallel. At very high frequencies, transit time effects reduce the forward conductance to 0·667 of the low frequency value and increase the input capacitance to 1·33 of the low frequency value. At low frequencies such that transit time effects can be neglected the reverse biased capacitance is constant and equal to the geometrical electrode capacitance; the forward biased capacitance is constant and equal to 0·75 of the reverse biased capacitance. There are no negative resistance effects at any frequency. Experimental measurements have been made on space-charge-limited cadmium sulphide diodes over the frequency range 50–1000 Mc/s. These confirm the theoretical analysis and support the physical model used for description of space-charge-limited current in solids.
Published Version
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