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2022
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Main influencing factors in the diamond deposition process of diamond deposition equipment
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Main influencing factors in the diamond deposition process of diamond‑depositing equipment Diamond growth is a highly complex process, influenced by numerous factors, such as the CH4/H2 gas mixture, carbon source concentration, deposition temperature, and growth pressure. These factors are discussed individually below:
Main influencing factors in the diamond deposition process of diamond deposition equipment
Diamond growth is a highly complex process, influenced by numerous factors, including the CH4/H2 gas mixture, carbon source concentration, deposition temperature, and growth pressure. These factors are discussed individually below:
The carbon‑source ratio of CH4/H2 is one of the most common and straightforward gas mixtures used in chemical vapor deposition (CVD) diamond growth. During the growth of single‑crystal diamond, methane concentration is a highly sensitive parameter; variations in methane levels directly influence the relative abundances of various reactive species in the plasma, thereby exerting a significant impact on the quality of the resulting diamond. Generally speaking, within a certain range of methane concentrations, the diamond growth rate exhibits a positive correlation with methane level. This is because, with other process parameters held constant, increasing the methane concentration elevates the abundance of carbon‑containing reactive species in the plasma, providing a greater supply of carbon‑bearing precursors and thus enhancing the diamond deposition rate.
Deposition temperature is a critically important parameter in diamond deposition; an appropriate temperature range can significantly enhance both the quality and efficiency of diamond growth. If the temperature is too low, a large amount of non‑diamond phases will form, inhibiting diamond growth. Conversely, if the temperature is too high, some of the diamond may be vaporized, preventing continuous film formation.
During diamond deposition, the deposition pressure is a critically important parameter. Changes in deposition pressure directly affect the plasma state: as pressure increases, the plasma volume decreases and its density rises. Deposition pressure not only influences the plasma’s power density but also has a significant impact on the substrate temperature; both the plasma power density and the substrate temperature, in turn, exert a direct influence on the diamond growth rate and quality. Consequently, it is essential to maintain the deposition pressure within an appropriate range throughout the diamond‑deposition process.
Diamond deposition equipment
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