Semiconductor device manufacturing: process – Making passive device – Stacked capacitor
Reexamination Certificate
2007-06-12
2007-06-12
Nguyen, Thanh (Department: 2813)
Semiconductor device manufacturing: process
Making passive device
Stacked capacitor
C438S255000
Reexamination Certificate
active
10368069
ABSTRACT:
A polysilicon film is formed with enhanced selectivity by flowing chlorine during the formation of the film. The chlorine acts as an etchant to insulative areas adjacent polysilicon structures on which the film is desired to be formed. Bottom electrodes for capacitors are formed using this process, followed by an anneal to create hemishperical grain (HSG) polysilicon. Multilayer capacitor containers are formed in a non-oxidizing ambient so that no oxide is formed between the layers. The structure formed is planarized to form separate containers made from doped and undoped amorphous silicon layers. Selected ones of undoped layers are seeded in a chlorine containing environment and annealed to form HSG. A dielectric layer and second electrode are formed to complete the cell capacitor.
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Pan James
Thakur Randhir P. S.
Micro)n Technology, Inc.
Nguyen Thanh
Schwegman Lundberg Woessner & Kluth P.A.
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