Patent ID: 6380005
Filing Date: 2002-04-30
Classification: H01L

Abstract:
A method for manufacturing a charge transfer device comprising the steps:preparing a semiconductor substrate having a semiconductor layer of a first conductivity type formed on a principal surface thereof; forming a first semiconductor region of a second conductivity type opposite to said first conductivity type, in said semiconductor layer of said first conductivity type; forming a first insulator film to cover said first semiconductor region of said second conductivity type; forming a plurality of first transfer electrodes on said first insulator film, with predetermined intervals; removing said first insulator film which is not covered with said first transfer electrodes; forming a second insulator film to cover said first semiconductor region of said second conductivity type between each pair of adjacent first transfer electrodes, and a third insulator film to cover a top surface and a side surface of each of said first transfer electrodes; introducing an impurity of said second conductivity type into said first semiconductor region of said second conductivity type, using said first transfer electrodes and said third insulator film as a mask, to form a second semiconductor region of said second conductivity type; and forming a plurality of second transfer electrodes each formed on said second insulator film on said second semiconductor region of said second conductivity type between each pair of adjacent first transfer electrodes and having opposite ends to partially overlap an adjacent end of the pair of adjacent first transfer electrodes.