Investigation of oxide layer removal mechanism using reactive gases

Hyun Tae Kim, Jung Soo Lim, Min Su Kim, Hoon Jung Oh, Dae Hong Ko, Gyoo Dong Kim, Woo Gon Shin, Jin Goo Park

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In a CMOS technology, the removal of silicon oxide and nitride layer is one of the critical steps as it represents a possible source of high contact resistance and a decrease of gate oxide reliability. In high aspect ratio (HAR), it is very difficult to remove SiO2 with wet etching. In the present study, the effect of the gases such as plasma dry etching of ammonia (NH3) and nitrogen trifluoride (NF3) on the SiO2 and Si3N4 substrates were analyzed and the etch rate was measured. The measurement of the SiO2 and Si3N4 thickness was measured by Ellipsometer. Various factors such as chamber pressure, electrode power and NH3/NF3 gas ratio were affected by the combination and dissociation of NH4F molecules. The existence of the by-product was analyzed by using a contact angle analyzer and scanning electron microscope, respectively. In this study we have found that, the removal efficiency was mainly dependent on the reaction mechanism and the effect of the by-product.

Original languageEnglish
Pages (from-to)17-22
Number of pages6
JournalMicroelectronic Engineering
Publication statusPublished - 2015 Mar 5

Bibliographical note

Funding Information:
This work was supported by the IT R&D program of MOTIE (10043438, Development of key cleaning technology for 10 nm-semiconductor and 8th generation display using damage free technology) and by the Future Semiconductor Device Technology Development Program #10045366 funded by MOTIE – South Korea (Ministry of Trade, Industry & Energy) and KSRC – South Korea (Korea Semiconductor Research Consortium).

Publisher Copyright:
© 2015 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering


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