Patent ID: 6946345
Filing Date: 2005-09-20
Classification: H01L

Abstract:
1. A method of forming a memory device, said method comprising: patterning a trench in a substrate; filling a lower portion of said trench with a capacitor conductor; forming a conductive buried strap in said substrate adjacent a top portion of said capacitor conductor; forming a trench top oxide in said trench above said capacitor conductor, wherein said forming of said trench top oxide includes forming a doped trench top oxide layer above said capacitor conductor, and forming an undoped trench top oxide layer above said doped trench top oxide layer; and after forming said first conductive buried strap and forming said doped trench top oxide, heating said device to form a second conductive buried strap in said substrate adjacent and connected to said first conductive buried strap; and depositing a conductive node strap in said trench adjacent said capacitor conductor.