Abstract:
A chemical-mechanical polishing machine having an improved wafer retainer ring design for the polishing head, comprising a polishing table, a polishing pad, a polishing head and a wafer retainer ring, wherein the polishing pad is above the polishing table, the polishing head is above the polishing pad, and the wafer retainer ring is mounted onto the polishing head. Improvement of the retainer ring design includes the formation of a plurality of guiding holes around the periphery of the retainer ring such that the guiding hole axis follows the centrifugal line produced by a rotating polishing head. Furthermore, the guiding hole has a gradual diffusing structure from the outer inlet to the inner outlet.
Abstract:
A method of preventing overpolishing in a chemical-mechanical polishing operation includes using a spin-on polymer material instead of spin-on glass as the local planarization material. The spin-on polymer layer is further used as a polishing stop layer so as to prevent damage to components due to overpolishing, because the polishing rate of the spin-on polymer layer in a chemical-mechanical polishing operation is, in general, lower than the polishing rate of the silicon dioxide layer formed using plasma enhanced chemical vapor deposition.
Abstract:
A method of fabricating a trench isolation structure in a semiconductor devices. First, a mask layer is formed on a substrate and patterned. Then, a trench is formed in the substrate using the mask layer as a mask. An insulating layer is formed under the mask layer to fill the trench. The insulating layer is polished to expose a portion of the mask layer and an insulating plug is left in the trench. A RTP is performed to avoid mobile ions diffuse into the substrate. There are several operating conditions for the RTP. For example the operating temperature is ranged from about 600.degree. C. to about 1300.degree. C. The duration for performing the RTP is ranged from about 5 seconds to about 5 minutes. The operating gas can be selected from one of a group of N.sub.2, O.sub.2, or N.sub.2 O. Besides, before the RTP a cleaning step is performed using SC-1 or hydrogen fluoride (HF) solution as cleaning solution.