High quality ultra thin Si/sub 3/N/sub 4/ film selectively deposited on poly-Si electrode by LPCVD with in situ HF vapor cleaning

M. Yoshimaru, N. Inoue, M. Itoh, H. Kurogi, H. Tamura, N. Hirasita, F. Ichikawa, M. Ino
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引用次数: 5

Abstract

Si/sub 3/N/sub 4/ film deposited by LPCVD with in situ HF vapor cleaning has been applied to dielectric film of stacked capacitor. The composition of the Si/sub 3/N/sub 4/ film deposited on poly-Si electrode becomes stoichiometric. The film shows low leakage current and high electrical reliability. But it brings a new problem. Si/sub 3/N/sub 4/ film deposited using in situ HF vapor cleaning shows selective deposition on poly-Si electrode. The edge of poly-Si electrode is not covered by Si/sub 3/N/sub 4/ film. This problem is avoidable by carpeting Si/sub 3/N/sub 4/ film under poly-Si electrode. This process realizes further improvement of stacked capacitor dielectric film reliability.<>
采用原位HF气相清洗的LPCVD技术在多晶硅电极上选择性地沉积了高质量的超薄Si/sub - 3/N/sub - 4/薄膜
采用原位HF气相清洗LPCVD方法制备了Si/sub 3/N/sub 4/薄膜,并将其应用于堆叠电容器的介电膜上。沉积在多晶硅电极上的Si/sub - 3/N/sub - 4薄膜的组成具有化学计量性。该薄膜泄漏电流小,电气可靠性高。但它带来了一个新问题。原位HF气相清洗沉积的Si/sub 3/N/sub 4/薄膜在多晶硅电极上表现出选择性沉积。多晶硅电极边缘未被Si/sub 3/N/sub 4/薄膜覆盖。通过在多晶硅电极下铺设Si/sub - 3/N/sub - 4薄膜,可以避免这一问题。该工艺进一步提高了堆叠电容器介质膜的可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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