Surface improvement investigation of sol-gel SiO2 cladding for waveguide device passivation

Satoshi Ogawa, Ahmad Syahrin Idris, Yu Han, Haisong Jiang, Kiichi Hamamoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The sol-gel method is a well-known process for SiO2 formation on top of a semiconductor-based waveguide. This method does not require expensive equipment or SiH4 gas. However, it may result in difficulty with wet-etching, which prevents proper current injection into the semiconductor layer. We have investigated the surface condition of sol-gel SiO2 on top of Si, and have confirmed that the main causes of the anti-etching property might be due to the formation of a polymer layer after the curing process. To improve the surface condition, plasma ashing, in addition to 700 °C curing, is proposed. Regular wet etching of SiO2 layer on Si with a ratio of 1800 nm min-1 has been successfully confirmed.

Original languageEnglish
Article numberSJJB04
JournalJapanese journal of applied physics
Issue numberSJ
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)


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