PATENT CLAIM ANALYSIS

Application Number: 15743783
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2018-07
Patent Classification: ["430", "005000"]

Abstract:
An object is to provide a mask blank for manufacturing a phase shift mask in which a thermal expansion of a phase shift pattern, which is caused when exposure light is radiated onto the phase shift pattern, and displacement of the phase shift pattern are suppressed to be small. A phase shift film has a function of transmitting exposure light from an ArF excimer laser at a transmittance of 2% or higher and 30% or lower and a function of generating a phase difference of 150° or larger and 180° or smaller between the exposure light that has been transmitted through the phase shift film and the exposure light that has passed through air by a distance equal to a thickness of the phase shift film. The phase shift film is formed of a material containing a metal and silicon, and has a structure in which a lower layer and an upper layer are laminated in the stated order from a transparent substrate side. The lower layer has a refractive index n at a wavelength of the exposure light that is smaller than that of the transparent substrate. The upper layer has a refractive index n at the wavelength of the exposure light that is larger than that of the transparent substrate. The lower layer has an extinction coefficient k at the wavelength of the exposure light that is larger than that of the upper layer. The upper layer has a thickness that is larger than that of the lower layer.

Claim (Index 1):
A mask blank, comprising a phase shift film on a transparent substrate,\n the phase shift film having a function of transmitting exposure light from an ArF excimer laser at a transmittance of 2% or higher and 30% or lower and a function of generating a phase difference of 150\u00b0 or larger and 180\u00b0 or smaller between the exposure light that has been transmitted through the phase shift film and the exposure light that has passed through air by a distance equal to a thickness of the phase shift film, the phase shift film being formed of a material containing a metal and silicon and having a structure in which a lower layer and an upper layer are laminated in the stated order from the transparent substrate side, the lower layer having a refractive index n at a wavelength of the exposure light that is smaller than a refractive index n at the wavelength of the exposure light of the transparent substrate, the upper layer having a refractive index n at the wavelength of the exposure light that is larger than the refractive index n at the wavelength of the exposure light of the transparent substrate, the lower layer having an extinction coefficient k at the wavelength of the exposure light that is larger than an extinction coefficient k at the wavelength of the exposure light of the upper layer, the upper layer having a thickness that is larger than a thickness of the lower layer.

Metadata:
- Claim Count in Document: 29.0
- Percentile: 86.0
- Lexical Diversity: 2.89011
- Patent Class: 430.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15576937', '15501659', '14222794', '13611707', '13920128']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.77018473361625
- 35 USC 102 Novelty (BERT): 0.5383652148916123
- Combined Prediction Score: 0.7470027817437862
- Mean Citation Score: 351.20439
- Max Citation Score: 381.74677
- Similarity Product: 355.2808895572918

Labels:
- Claim Label 101: 1
- Claim Label 102: 0
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 0
- Label 101 Adjusted: 1

Dataset: test