Charge coupled devices employing nonuniform concentrations...

Details Charge coupled devices employing nonuniform concentrations... Charge coupled devices employing nonuniform concentrations...

G - Physics

11

C

352/82.22

G11C 11/40 (2006.01) G11C 19/28 (2006.01) H01L 29/10 (2006.01) H01L 29/768 (2006.01) H01L 29/80 (2006.01)

Patent

CA 1096041

Abstract of the Disclosure In Charge Coupled Apparatus laterally graded distributions of immobile charge are disposed under the electrodes and, optionally, between the electrodes to enhance the desired unidirectionality of charge transfer and, optionally, to enable the gap regions between electrodes to act as active storage sites in the information channel. A graded distribution of immobile charge under an electrode provides a built-in electric field in the desired direction of charge propagation so that field- enchanced charge transfer, and concomitant improved speed, is effected. A graded distribution of immobile charge in a gap between electrodes provides a built-in, suitably asymmetric potential well in the gap. This built-in potential well in the gap can be used as a temporary storage site for charge carriers (much like any other potential well in a CCD) to enable one-phase operation and more compact devices.

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