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1. Application of Gas Mass Flow Meter in MOCVD Technology
Gas mass flow meter is one of the core equipment in semiconductor thin film preparation, which ensures the quality of thin film growth and process stability by accurately controlling the gas flow rate in MOCVD technology. The specific application requirements, process plan, and advantages are as follows:
1. Application requirements: MOCVD technology uses a carrier gas to transport metal organic compounds (such as trimethyl gallium) and hydrides (such as ammonia) and other reaction sources to the reaction chamber, where chemical reactions occur on high-temperature substrates to generate thin films. This process requires the following requirements for gas flow control: high-precision measurement: the film growth rate and composition directly depend on the gas flow ratio. The accuracy of gas mass flow meters can usually reach ± 0.5% FS (full range), which can accurately control the flow rate of reaction gas, ensure the uniformity and performance consistency of the film. For example, in the preparation of GaN based LEDs, the flow ratio of gallium source (TMGa) and nitrogen source (NH?) needs to be accurate to the millisecond level to avoid component deviation leading to a decrease in device efficiency. Stability guarantee: Temperature fluctuations (up to 1200 ℃) and pressure fluctuations (normal or low pressure) inside the closed MOCVD reaction chamber may affect gas density and flow rate. Gas mass flow meters are based on thermal or Coriolis principles, directly measuring mass flow without interference from temperature and pressure changes, ensuring long-term stable operation. Intelligent management: Contemporary devices support communication protoco
Secondly, the core function of gas mass flow meters in MOCVD systems is reflected in gas control and mixing systems, including: reaction gas flow control: multi-channel gas coordination: MOCVD requires simultaneous control of multiple gases (such as TMGa, NH?).
? The flow rate of sources such as silane and magnesium is controlled independently by the flow meter to ensure accurate mixing ratios. For example, in the growth of InGaN quantum wells, the flow rate of indium source (TMIn) needs to be dynamically adjusted to form a gradient structure, and the fast response of the flowmeter (response time<100ms) can meet this requirement. Dynamic flow regulation: Through PID control algorithm, the flow meter can adjust the gas flow rate in real time to meet the needs of different stages of film growth (such as nucleation period and growth period). Tail gas treatment support: MOCVD tail gas contains unreacted metal impurities, pure organic compounds, hydrides, and particulate matter, which require wet scrubbing or combustion treatment. The flow meter measures the exhaust gas flow rate and optimizes the system parameters (such as washing liquid flow rate and combustion temperature) to ensure that the exhaust gas meets the emission standards while avoiding resource waste.III. Significant Advantages The application of gas mass flow meters brings the following improvements to the MOCVD process: Improving film quality: Accurately controlling gas flow can reduce film defects (such as
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