Future trends for interlayer dielectric films and their formation technologies in ULSI multilevel interconnections

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In the future quarter-micron multilevel interconnections, the interlayer dielectric film properties and their formation techniques will have to meet three requirements: (1) a high surface planarization capability, (2) a low dielectric constant, and (3) a low deposition temperature. In order to achieve these requirements, many technologies have been investigated. Selective deposition of SiO2 films is the best way to achieve full planarization of the interlayer dielectric film surface. Two selective SiO2 film deposition techniques have been developed. One is a liquid phase deposition (LPD) technique at room temperature, using a supersaturated hydrofluosilicic acid (H2SiF6) aqueous solution. The other is a semiselective SiO2 film deposition technique at 390 °C, using tetraethylorthosilicate (TEOS, Si(OC2H5)3) and ozone (O3) as gas sources, with the assistance of tetrafluorocarbon (CF4) plasma pretreatment for TiW or TiN surfaces of wiring top layers. The dielectric constant of SiO2 films can be reduced from 3.9-4.3 to 3.7 at 1 MHz, by the LPD technique or a room temperature chemical vapor deposition (RTCVD) technique using the fluorotrialkoxysilane (FTAS) group and pure water as gas sources. Room temperature film formation can be achieved by the following three techniques: (i) LPD, (ii) RTCVD, and (iii) fluoroalkoxysilane vapor treatment (FAST) for spin-on-glass (SOG).

Original languageEnglish
Pages (from-to)234-239
Number of pages6
JournalMaterials Chemistry & Physics
Issue number4
Publication statusPublished - 1995 Sept
Externally publishedYes


  • Dielectric constant
  • Interlayer dielectric films
  • Multilevel interconnections
  • Surface planarization
  • Ultra large scale integrated circuit (ULSI)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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