Patent ID: 6936154
Filing Date: 2005-08-30
Classification: H01L

Abstract:
1. A method for detecting planarization of a top surface of a workpiece with features in an electrochemical mechanical deposition process that uses a solution containing a conductor therein and operates upon the top surface comprising: depositing the conductor to fill the features within the top surface of the workpiece using electrochemical mechanical deposition employing a workpiece surface influencing device, an applied potential and the solution; transmitting a beam of light onto the top surface of the workpiece to obtain a reflected beam of light, a characteristic of the reflected beam of light being altered by a top surface pattern that exists due to the features within the top surface of the workpiece; and detecting, during electrochemical mechanical deposition, a change in the characteristic of the reflected beam of light indicative of a degree of planarization to the top surface of the workpiece.