UNITÉ DE POLISSAGE DE BORD DE TRANCHE, ET APPAREIL ET PROCÉDÉ DE POLISSAGE DE BORD DE TRANCHE LA COMPRENANT

摘要

An embodiment provides a wafer edge polishing unit comprising: a process chamber; a polishing stage which is arranged in a lower region of the process chamber and on which a wafer is arranged; a polishing unit, arranged at an edge of the polishing stage, for polishing the wafer; a slurry storage unit arranged in an upper region of the process chamber; a slurry supply unit for supplying a slurry to the slurry storage unit; a pure water supply unit for supplying pure water to an upper region of the polishing stage; a first pipe for supplying the slurry from the slurry storage unit to the polishing stage; a turbidity detection unit for detecting the turbidity of the slurry inside the first pipe; a second pipe for recovering the slurry from the polishing stage to the slurry storage unit; and a control unit for adjusting the amount of the slurry supplied from the slurry supply unit to the slurry storage unit according to the detected turbidity.