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    • 93. 发明授权
    • Planarized trench and field oxide and poly isolation scheme
    • 平面化沟槽和场氧化物和多晶隔离方案
    • US5385861A
    • 1995-01-31
    • US213144
    • 1994-03-15
    • Rashid BashirFrancois HebertDatong Chen
    • Rashid BashirFrancois HebertDatong Chen
    • H01L21/762H01L21/763H01L21/76
    • H01L21/76227H01L21/763Y10S148/05
    • A novel device isolation scheme for separating active regions on a semiconductor substrate by combining field oxide formation with trench isolation is disclosed. According to this scheme, shallow and deep trenches are etched into the semiconductor substrate. A layer of nitride is deposited over the entire substrate followed by a layer of poly-silicon. Oxide spacers on the poly-silicon and a photoresist mask is aligned within the oxide spacers, thereby permitting the selective etching of the poly-silicon layer. The poly-silicon layer overlying the active regions of the semiconductor substrate are etched away. Then an oxidation step is performed such that the poly-silicon layer filling the shallow trenches is oxidized while the poly-silicon filling the deep trenches remains unoxidized. The alignment of the photoresist becomes highly non-critical because of the use of the oxide spacers and fully walled junctions are provided.
    • 公开了一种用于通过组合场氧化物形成和沟槽隔离来分离半导体衬底上的有源区的新型器件隔离方案。 根据该方案,将浅沟槽和深沟槽蚀刻到半导体衬底中。 一层氮化物沉积在整个衬底上,随后是一层多晶硅。 在多晶硅和光致抗蚀剂掩模之间的氧化物间隔物在氧化物间隔物内对准,从而允许多晶硅层的选择性蚀刻。 覆盖半导体衬底的有源区的多晶硅层被蚀刻掉。 然后执行氧化步骤,使得填充浅沟槽的多晶硅层被氧化,而填充深沟槽的多晶硅保持未氧化。 由于使用氧化物间隔物并且提供了完全的壁结,因此光致抗蚀剂的取向变得非常关键。