Patent ID: 7846791
Filing Date: 2010-12-07
Classification: H01L

Abstract:
1. A design structure embodied in a computer readable medium for performing a means for fabricating a trench capacitor, the design structure comprising: means for providing a semiconductor substrate; means for forming a pad layer on the semiconductor substrate; means for forming a trench in the semiconductor substrate; means for depositing a dielectric layer on a sidewall of the trench; means for filling the trench with a first layer of undoped polysilicon; means for etching away the first layer of undoped polysilicon and the dielectric layer from an upper section of the trench whereby the semiconductor substrate is exposed at the sidewall in the upper section of the trench, and undoped polysilicon remains in a lower section of the trench; means for forming an isolation collar layer on the sidewall in the upper section of the trench; and means for filling the trench with a second layer of doped polysilicon.