Patent ID: 6960265

Claim:
An apparatus for collecting metallic impurities on a semiconductor wafer, comprising: a process chamber comprising a loading unit for loading the semiconductor wafer and an unloading unit for unloading the semiconductor wafer; a vapor phase decomposition unit disposed in the process chamber for decomposing a silicon oxide layer on the semiconductor wafer; and a scanning unit disposed in the process chamber for scanning the semiconductor wafer to collect metallic impurities, the scanning unit comprising: a scanning solution bottle for storing scanning solution that is used for absorbing metallic impurities on the semiconductor wafer; a scanning arm that moves in a downward, upward, and rotational motion; and a nozzle for coupling to the scanning arm for drawing in scanning solution from the scanning solution bottle, and for forming a droplet of scanning solution that coheres to the nozzle when scanning the semiconductor wafer to collect metallic impurities.