PATENT CLAIM ANALYSIS

Application Number: 16169796
Application Type: Utility
Filing Date: 2018-10
Publication Date: 2019-03
Patent Classification: ["257", "774000"]

Abstract:
For simplifying the dual-damascene formation steps of a multilevel Cu interconnect, a formation step of an antireflective film below a photoresist film is omitted. Described specifically, an interlayer insulating film is dry etched with a photoresist film formed thereover as a mask, and interconnect trenches are formed by terminating etching at the surface of a stopper film formed in the interlayer insulating film. The stopper film is made of an SiCN film having a low optical reflectance, thereby causing it to serve as an antireflective film when the photoresist film is exposed.

Claim (Index 1):
A manufacturing method of a semiconductor integrated circuit device, comprising the steps of:\n (a) forming a semiconductor element over the main surface of a semiconductor substrate and forming at least one first-level interconnect over the semiconductor element; (b) forming a first interlayer insulating film over the first-level interconnect and forming a first stopper film in the first interlayer insulating film; (c) forming a first antireflective film over the first interlayer insulating film and forming thereover a first photoresist film; (d) etching the first antireflective film, the first interlayer insulating film and first stopper film with the first photoresist film as a mask to form a first via hole in the first interlayer insulting film; (e) removing the first photoresist film and first antireflective film and then filling a first filler inside of the first via hole; (f) after the step (e), forming a second photoresist film over the first interlayer insulating film without using an antireflective film; (g) etching, with the second photoresist film as a mask, the first interlayer insulating film in a region including a region in which the first via hole has been formed, thereby forming a first interconnect trench in the first interlayer insulating film over the first stopper film; (h) removing the second photoresist film and first filler and then filling a metal film in the first interconnect trench and first via hole to form a second-level interconnect, wherein the first stopper film is made of a material having a low optical reflectance and utilized as an antireflective film when the second photoresist film formed over the first interlayer insulating film is exposed and a pattern of the first interconnect trench is transferred thereto.

Metadata:
- Claim Count in Document: 26.0
- Percentile: 97.0
- Lexical Diversity: 1.76786
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['11453882', '12141195', '13081332', '13525195', '12141172']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9347588279947664
- 35 USC 102 Novelty (BERT): 0.6035764467845883
- Combined Prediction Score: 0.9016405898737486
- Mean Citation Score: 486.80999
- Max Citation Score: 509.54678
- Similarity Product: 504.0535737967157

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

Dataset: test