Patent ID: 7141339
Filing Date: 2006-11-28
Classification: C23C,G03F

Abstract:
1. A process for manufacturing half-tone phase shifting mask blanks each having a phase shifting film containing at least one half-tone film on a transparent substrate, comprising the step of providing a target containing a metal and silicon, and carrying out reactive sputtering in an atmosphere containing a reactive gas, to form said half-tone film on said transparent substrate, wherein the formation of the half-tone film by said reactive sputtering is carried out using, as said target, a target having a metal/silicon compositional ratio selected so as to give a desired phase angle and transmissivity of the half-tone film, at a reactive gas flow rate selected from a region where a change in the discharge voltage is within about 20 V when the flow rate of the reactive gas changes by 10 SCCM (standard state cm