摘要:
A storage node for deep trench-based storage capacitor is formed by etching a trench (11) in a surface of a semiconductor substrate (10), forming a layer of dielectric (14) on a sidewall of the trench, partially removing the layer of dielectric material in order to expose an upper portion of the sidewall, growing a layer of oxide (16) on the upper portion of the sidewall, removing the remainder of the layer of dielectric material, doping to form a buried plate (17), forming a node dielectric (18), and forming an inner electrode (19) within the trench. The oxide layer at the upper portion of the trench is preferably formed by a LOCOS technique.