Process for the production of a charge shift arrangement by a two-phase technique

Abstract

Abstract A two-phase ion implantation process to form a charge coupled device comprising forming an electrically insulating layer on a semiconductor substrate, forming a metal layer on said insulating layer, forming a photo-resist layer on said metal layer, selectively etching areas of the photo-resist layer and the metal layer therebelow to provide spaced electrodes, subjecting the gaps between the electrodes to an ion implantation beam directed at one corner of each gap at a relatively small angle to the plane of the substrate to cause ions to be implanted below one edge region of each electrode, subjecting the gaps to a second ion implantation beam directed at an oblique angle to the substrate which is larger than the angle of said first ion beam to cause ions to be implanted in the substrate beneath each gap but spaced from the edge of the gap which lies opposite to the said one edge, removing the photo-resist layer, forming a second electric insulating layer over the said electrodes and over the bottom and sides of the gaps, forming a second group of electrodes on the second insulating layer over each gap between adjacent electrodes. The ions of the first ion beam are of the same type as are contained in the substrate. The ions of the second beam are of the opposite type to those contained in the substrate. In a preferred embodiment, the ions of the first beam are phosphorus ions, the ions of the second beam are boron ions, and the semiconductor substrate is silicon.

Inventors

• 👤 Karl Goser
• 👤 Karl-Ulrich Stein

Bibliographic Details