Patent ID: 6306724
Filing Date: 2001-10-23
Classification: H01L

Abstract:
In a method of forming a stack trench capacitor, including the steps of: forming an interface layer onto a semiconductor substrate; forming a buffer layer onto said interface layer; forming a first trench through said interface layer, said buffer layer, and into said semiconductor substrate; forming a trench wall layer on interior walls of said first trench, said trench wall layer being in contact with a remaining interface layer on said semiconductor substrate; removing a portion of said trench wall layer in said first trench; forming a trench filler layer onto said trench wall layer within said first trench; forming a storage dielectric onto said trench filler layer within said first trench; forming a field plate layer onto said storage dielectric within said first trench; a method for forming a trench isolation structure comprising:forming a second trench through said interface layer, said buffer layer, and into said semiconductor substrate;forming a trench wall layer on interior walls of said second trench, said trench wall layer being in contact with a remaining interface layer on said semiconductor substrate;forming a trench filler layer onto said trench wall layer within said second trench;forming a storage dielectric onto said trench filler layer within said second trench;forming a field plate layer onto said storage dielectric within said second trench; andforming a trench cap layer on said field plate layer in said second trench such that said trench filler layer, said storage dielectric, and said field plate layer are surrounded by said trench wall layer and said trench cap layer in said second trench.