Sealing ring assembly and mounting method

A method for improving the circulation of electrolyte in an electrochemical cell used for ECV profiling of a semiconductor sample comprising:

• locating a sealing ring assembly upon the cell to define a contact area between electrolyte within the cell and the semiconductor sample, wherein the assembly comprises a sealing ring provided with a generally axial central bore and a sealing ring holder adapted to engage upon an electrochemical cell and so retain the sealing ring in position, the holder being provided with at least one secondary bore forming a nozzle in the holder providing fluid communication between a forward face of the holder and the central bore of the ring, and being directed parallel to but tangentially offset relative to the inner wall of the central bore;
• associating a semiconductor sample with the cell in such position as to be in electrical contact with the electrolyte in use;
• using the nozzle(s) to fill the electrochemical cell with electrolyte.