Patent ID: 6793795
Filing Date: 2004-09-21
Classification: H01L

Abstract:
Method of electrolytically forming conductor structures from highly pure copper on semiconductor substrate surfaces, provided with recesses, when producing integrated circuits with the following method steps:a. coating the semiconductor substrate surfaces, which are provided with the recesses, with a full-surface basic metal layer in order to obtain sufficient conductance for the electrolytic deposition; b. full-surface deposition of copper layers having a uniform layer thickness on the basic metal layer by an electrolytic metal deposition method by bringing the semiconductor substrate surfaces into contact with a copper deposition bath, i. the copper deposition bath containing at least one copper ion source, at least one additive compound for controlling the physico-mechanical properties of the copper layers, and Fe(II) compounds and/or Fe(III) compounds, and ii. an electric voltage being applied between the semiconductor substrate surfaces and dimensionally stable counter-electrodes, which are insoluble in the bath and are brought into contact therewith, so that an electric current flows between the semiconductor substrate surfaces and the counter-electrodes; c. structuring the copper layer.