HALFTONE PHASE SHIFT MASK BLANK, HALFTONE PHASE SHIFT MASK, AND PATTERN TRANSFER METHOD

摘要

In a halftone phase shift mask blank comprising a substrate, a light absorbing film, and a phase shifter film, the light absorbing film contains a metal element of Group 4A in a distribution having a higher metal element content in an upper region than in a lower region. Also provided is a halftone phase shift mask blank comprising a transparent substrate and a halftone phase shift film of a single layer or multiple layers having a preselected phase difference and transmittance, wherein at least one layer of the halftone phase shift film contains at least 90 atom% of silicon and a plurality of metal elements, typically Mo and Zr or Hf.