Patent ID: 6533892
Filing Date: 2003-03-18
Classification: H01L

Abstract:
A device for etching a backside of a wafer, comprising:a cylindrical housing having a bottom wall, said bottom wall being conically shaped such that the bottom wall peaks at its center; an annular etching dam seated on an upper surface of the conical bottom wall of said housing, with an etchant collecting chamber defined between a sidewall of said dam and a sidewall of said housing, and an etching bath defined inside the dam for containing an etchant; an etchant supply unit provided on the conical bottom wall of said housing for feeding the etchant into said etching bath; at least one first etchant discharging part formed at a junction of the etching dam and the housing, and allowing the etching bath to communicate with the etchant collecting chamber; and at least one second etchant discharging part formed on a lower portion of the sidewall of said housing, and allowing the etchant collecting chamber to communicate with the outside of the device, whereby the target wafer is seated on an upper portion of the etching dam, and is etched at its backside by the etchant fed from the etchant supply unit into the etching bath.