Breakthrough in Photolithography: Organotin Compounds as Photoresists

Strategic Insights -

Researchers at the semiconductor industry are racing to develop technologies that enable the creation of smaller devices with higher performance and lower costs. One such advancement has been made in the field of photolithography, a critical manufacturing process for creating microelectronic patterns on semiconductor wafers. According to a patent application filed by inventor Lu, Feng, organotin compounds have been identified as a potential solution to improve EUV lithography for smaller level devices.

The inventor, Lu, Feng, from Irvine, CA, US, has developed a novel class of organotin compounds that can be used as photoresists or precursors for photolithography patterning. These compounds exhibit improved properties, such as resolution, sensitivity, etch resistance, and line edge roughness, making them suitable for the next generation of semiconductor devices. The inventor's summary information highlights the significance of these organotin compounds: "The present invention is to provide improved resolution sensitivity, etch resistance, and lower line width/edge roughness without pattern collapse for photolithography patterning."

Key Takeaways:

  • The invention relates to organotin compounds that can be used as photoresists or precursors for photolithography patterning.
  • These compounds exhibit improved properties, such as resolution, sensitivity, etch resistance, and line edge roughness.
  • The invention pertains to radiation-sensitive organotin compounds containing cyclopentadienyl, sulfur, selenium, or tellurium groups.
  • The organotin compounds have a high ultraviolet light absorption due to the presence of metals with high absorption capacity of ultraviolet radiation.
  • The properties of EUV photoresist, such as resolution, sensitivity, line edge roughness (LER), line width roughness (LWR), etch resistance, and ability to form thinner layers are critical in photolithography processes.
  • The organotin compounds can be applied to a substrate in a uniformed solution composition and can be patterned after exposure to extreme ultraviolet radiation (EUV), deep ultraviolet radiation (DUV), electron beam radiation, X-ray radiation, or ion-beam radiation.

Statistics:

  • The described organotin compounds have a high resolution sensitivity, which can improve the overall efficiency of the photolithography process.
  • The etch resistance of these compounds is higher compared to traditional photoresist materials, reducing the risk of pattern collapse and improving the overall yield of the photolithography process.
  • The line edge roughness (LER) and line width roughness (LWR) of the organotin compounds are reduced, resulting in more precise and accurate pattern formation.

Sources:

  • Lu, Feng. Organotin Compounds As Photoresists, And/Or Precursors. U.S. Patent Application Number 20250306460, filed March 28, 2025 and posted October 2, 2025. Patent URL (for desktop use only): https://ppubs.uspto.gov/pubwebapp/external.html?q=(20250306460)&db=US-PGPUB&type=ids