Patent ID: 7943463

Claim:
A method of semiconductor processing comprising: forming undoped polysilicon on an oxide surface of a trench, the undoped polysilicon formed via depositing a disilane (Si 2 H 6 ) precursor material on the oxide surface at a process temperature below 450° C. and sufficient to induce thermal decomposition of the disilane precursor material into the undoped polysilicon; and forming a boron-doped polysilicon on a surface of the undoped polysilicon within the trench at a substantially the same process temperature below 450° C. to prevent void formation within the trench, the doped polysilicon formed via depositing a silane (SiH 4 ) precursor material and a boron dopant material on the surface of the undoped polysilicon; wherein a nucleation time associated with forming the boron-doped polysilicon on the surface of the undoped polysilicon within the trench at the process temperature below 450° C. is less than two minutes.