Patent ID: 8557673

Claim:
A manufacturing method of high capacitance capacitor structure, comprising the steps of: providing a substrate ( 15 ) having a first oxide layer ( 17 ) formed on a top surface thereof; forming a first suspension layer ( 11 ) on the first oxide layer; forming a first shallow trench ( 13 ) through the first suspension layer into the first oxide layer above the substrate; forming a second oxide layer on the first suspension layer ( 11 ) and filling the first shallow trench; forming a second suspension layer ( 12 ) on the second oxide layer; forming a second shallow trench ( 14 ) through the second suspension layer ( 12 ) into the second oxide layer above the first suspension layer ( 11 ); forming at least one deep trench ( 16 ) on the bottom surface of the second shallow trench ( 14 ) through the first oxide layer ( 17 ) and the second oxide layer, the cross-section of the deep trench ( 16 ) being smaller than that of the second shallow trench ( 14 ); forming a electrode layer ( 18 ) on the inner surface of the deep trench; and removing the first oxide layer and the second oxide layer through the trench openings in the first and the second suspension layers.