METHOD OF MANUFACTURING A SEMICONDUCTOR DEVICE, METHOD OF CLEANING SUCH A DEVICE, AND CLEANING AGENT FOR THIS PURPOSE

摘要

A conductor track or so-called via (6) is advantageously provided by means of a so-called Damascene process in the manufacture of, for example, ICs. The conductive material (6) used often comprises two materials (7, 8), such as an aluminum-copper alloy (6) which is provided in a recess (5) or through opening (5) in an insulating layer (4). First a thick layer of the desired material (6) is provided over the insulating layer (4) and the recess (5) therein. Then the conductive material (6) is removed from outside the recess (5) again by means of chemical-mechanical polishing. This, however, leads to a roughening of the surface of the remaining conductive material (6), which is undesirable. According to the invention, a first layer (7) of the first material, for example aluminum, is first provided over the insulating layer (4) and the recess (5) therein in such a process, and subsequently part of the first layer (7) of the first material is removed by means of a chemical etchant, preferably by means of chemical-mechanical polishing, whereupon a second layer (8) which is thin compared with the first layer (7) and which is made of the second material, for example copper, is provided over the remaining portion of the first layer (7) of the first material, after which the remaining portion of the first layer (7) of the first material and the second, comparatively thin layer (8) of the second material are mixed with one another by means of a thermal treatment. Since the first layer (7) comprises only a single material, a conductor track or via (6) is thus obtained without the surface thereof being roughened. The invention also relates to a method of cleaning an IC which comprises a conductor track or via (6) of a material comprising aluminum, and a cleaning agent suitable for this purpose.