Sidewall protection by nitrogen in anisotropic etching of P-doped poly-Si1.xGex

Hang Sup Cho, Shinobu Takehiro, Masao Sakuraba, Junichi Murota

Research output: Contribution to conferencePaper

Abstract

Sidewall protection by nitrogen in anisotropic etching of P-doped poly-Si1.xGex has been investigated using electron-cyclotron-resonance (ECR) chlorine plasma. It is found that the sidewall protection with only N2 addition in chlorine plasma is weaker than that of P-doped poly-Si. Highly anisotropic etching of P-doped poly-Si0.4Ge0.6 is achieved by both N2 and SiCl4 additions. In the investigation of X-ray photoelectron spectroscopy (XPS) for P-doped poly-Si0.4Ge0.6 after the radical dominant etching, it is found that an ultrathin Si nitride film is formed by the addition of both SiCl4 and N2. From these results, it is suggested that highly anisotropic etching of P-doped poly-Si 1-xGex is achieved by the protective Si nitride formation on the sidewall against chlorine radical etching.

Original languageEnglish
Pages243-250
Number of pages8
Publication statusPublished - 2004 Dec 1
EventSiGe: Materials, Processing, and Devices - Proceedings of the First Symposium - Honolulu, HI, United States
Duration: 2004 Oct 32004 Oct 8

Other

OtherSiGe: Materials, Processing, and Devices - Proceedings of the First Symposium
CountryUnited States
CityHonolulu, HI
Period04/10/304/10/8

ASJC Scopus subject areas

  • Engineering(all)

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