Patent ID: 7988835
Filing Date: 2011-08-02
Classification: C23C,H01L

Abstract:
1. A silicon dot forming method including: a silicon film forming step of supplying a silane-containing gas and a hydrogen gas into a vacuum chamber, applying a high-frequency power to these gases to generate plasma in the vacuum chamber, and forming a silicon film on an inner wall of the vacuum chamber with the plasma; and a silicon dot forming step of arranging a silicon dot formation target substrate in said vacuum chamber provided with the silicon film formed on the inner wall, supplying a sputtering gas into the vacuum chamber, applying a high-frequency power to the gas to generate the plasma in the vacuum chamber, and effecting chemical sputtering on a sputter target formed of the silicon film with the plasma to form silicon dots on the substrate; wherein the plasma exhibits a ratio (Si(288 nm)/Hβ) of 10.0 or lower between an emission intensity Si(288 nm) of silicon atoms at a wavelength of 288 nm and an emission intensity Hβ of hydrogen atoms at a wavelength of 484 nm in plasma emission; and wherein the ratio (Si(288 nm)/Hβ) of 10.0 or lower is obtained by comparing a measured emission intensity ratio (Si(288 nm)/Hβ) with a reference emission intensity ratio (Si(288 nm)/Hβ) predetermined within a range not exceeding 10.0, and controlling at least one of a power output of a high-frequency power applying device, a supply amount of the hydrogen gas supplied from a hydrogen gas supply device into the vacuum chamber, a supply amount of the silane-containing gas supplied from a silane-containing gas supply device into the vacuum chamber, and an exhaust amount of an exhaust device such that the emission intensity ratio (Si(288 nm)/Hβ) of the plasma in the vacuum chamber changes toward the reference emission intensity ratio.