Patent ID: 7820535
Filing Date: 2010-10-26
Classification: C25D,G01N

Abstract:
1. A method for analyzing a copper electroplating solution used in copper electroplating for filling a copper metal in a via-hole or a trench installed in a semiconductor product, which comprises using an electrochemical cell composed of a working electrode (rotary electrode), a reference electrode and a copper electrode (counter electrode) for a copper electroplating solution, electrolyzing a solution with the working electrode (rotary electrode) as a cathode so as to make a cathode current density controlled in a range of 0.1-20 A/dm 2 , determining a time-dependent potential change between the cathode and the reference electrode for a predetermined period of time after the start of the electrolysis, and judging fillability with the copper electroplating solution from the time-dependent change curve profile, wherein the fillability is judged by approximating a time-dependent potential change curve for a predetermined period of time after the start of an electrolysis, according to a Boltzmann's function represented by the following numerical formula (1), to thereby obtain a potential change speed dx in an initial stage and a potential convergent point A 2 :