Patent ID: 7863161

Claim:
A method of cutting a wafer, comprising: attaching a supporting member on an upper surface of the wafer having a plurality of semiconductor chips; forming an opening at a lower surface of the wafer along a scribe lane of the wafer; plasma-etching the lower surface of the wafer to reduce a thickness of the wafer; attaching a tensile tape on the lower surface of the wafer, the tensile tape including sequentially stacked tensile films that have a different tensile modulus from each other; removing the supporting member; cooling the tensile tape to increase the tensile modulus difference between the tensile films; and tensing the tensile tape until the tensile films are cut using the tensile modulus difference to separate the tensile tape from the semiconductor chips, wherein forming the opening comprises forming a preliminary opening, which does not expose the supporting member, from the lower surface of the wafer, and plasma-etching the lower surface of the wafer comprises removing a portion of the wafer exposed through the preliminary opening to form the opening exposing the supporting member.