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High Field Phenomenon of Cadmium Selenide

IP.com Disclosure Number: IPCOM000094192D
Original Publication Date: 1966-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Narken, B: AUTHOR [+2]

Abstract

This phenomenon is the electrical behavior of sintered cadmium selenide, after post-treatment with sulfur or selenium.

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High Field Phenomenon of Cadmium Selenide

This phenomenon is the electrical behavior of sintered cadmium selenide, after post-treatment with sulfur or selenium.

When an electrical potential greater than 3000 V/cm is applied to this material, it conducts a pulsating current, exhibiting a hysteresis loop as indicated by A in that the pulsating current can be either off or on in a certain voltage range above the minimum. The hysteresis loop is effected by irradiation. The width of the loop decreases with increasing intensity of irradiation until the hysteresis disappears. Because of this, it is possible, with constant field, to trigger on conduction with low intensity light pulses and furthermore, quench conduction by high intensity irradiation.

The nature of the pulsating current is one in which very high frequency single pulses occur every one to ten milliseconds, 100-1000 cp repetition rate. The material exhibits a definite refractory period in which it cannot be forced to produce a pulse, even at extremely high fields. Conversely, the field can be removed entirely for durations not longer than the refractory period and the pulsating current is sustained. Pulse shape is controlled by external circuit conditions.

Pulses are produced with durations in the range of nanoseconds to milliseconds without altering the repetition rate. Drawing B shows a typical shape of a pulse train with pulse duration of a few microsecond Each pulse has a current of several amperes whic...