{
  "patent_number": "US 12735785",
  "country": "US",
  "title": "Making Better Carbon Hardmasks for Chip Manufacturing",
  "original_title": "High selectivity, low stress, and low hydrogen carbon hardmasks in low-pressure conditions with wide gap electrode spacing",
  "summary": "This patent describes a method for creating special carbon layers, called hardmasks, used in making computer chips, by using a unique plasma process that makes them stronger and easier to remove.",
  "what_it_does": "This patent describes methods and equipment for depositing an ashable hard mask (AHM) onto a substrate, typically a silicon wafer. The core mechanism involves using a plasma process with a specific setup: a \"wide gap electrode spacing\" in \"low-pressure conditions.\" This combination helps to control unwanted plasma formations, known as \"parasitic plasmas,\" which can otherwise degrade the quality of the deposited layer. By controlling these plasmas, the method enables the creation of AHMs that have \"high selectivity\" (meaning they protect underlying materials very well during etching), \"low stress\" (less prone to cracking or warping), and \"low hydrogen\" content (making them easier to remove later). For example, this process could be used to deposit a carbon hardmask onto a silicon wafer before etching tiny, intricate patterns for a new generation of microprocessors.",
  "what_it_does_not_cover": [
    "Does not cover hardmasks made from materials other than carbon, such as silicon dioxide or silicon nitride.",
    "Does not cover deposition processes that use narrow electrode spacing or high-pressure conditions.",
    "Does not cover hardmasks that are not 'ashable' or easily removed after their purpose is served.",
    "Does not cover the actual etching of features into the underlying substrate, only the deposition of the protective mask.",
    "Does not cover methods for depositing hardmasks without controlling parasitic plasmas."
  ],
  "filed": "2021-12-13",
  "granted": "2026-09-15",
  "expires": null,
  "status": "active",
  "holder": null,
  "holder_url": null,
  "inventors": [],
  "times_cited": 0,
  "tags": [
    "semiconductors",
    "consumer_electronics",
    "manufacturing",
    "materials"
  ],
  "abstract": "Provided herein are methods and related apparatus for depositing an ashable hard mask (AHM) on a substrate by providing a wide gap electrode spacing in low-pressure conditions. A wide gap electrode may facilitate control of parasitic plasmas in low-pressure conditions, thereby enabling formation of high selectivity, low stress, and low-hydrogen AHMs. The AHM may then be used to etch features into underlying layers of the substrate.",
  "url": "https://patentbrief.org/patent/us/12735785/high-selectivity-low-stress-and-low-hydrogen-carbon-hardmasks-in-low-pressure",
  "markdown_url": "https://patentbrief.org/patent/us/12735785/high-selectivity-low-stress-and-low-hydrogen-carbon-hardmasks-in-low-pressure/md",
  "google_patents_url": "https://patents.google.com/patent/US12735785",
  "relatedPatents": []
}