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- W2969411813 abstract "Methane (CH4) concentration and temperature distributions were measured in a semiconductor process chamber using computed tomography-tunable diode laser spectroscopy (CT-TDLAS). A semiconductor chamber was designed with 32 laser-paths to collect the infrared spectrum of CH4 with tunable diode laser absorption spectroscopy. Absorptions at wavelength of 1628.1 nm and 1653.7 nm were used to reconstruct CH4 concentration and temperature distributions using computed tomography (CT) calculations. The validity of our CT algorithm for concentration and temperature distributions was checked using computer fluid dynamics. Concentration and temperature distributions were generated by injecting CH4 with different concentrations (5% or 10%) into the four inlet ports and setting different temperatures (25°C or 125 °C) for four heater blocks on the susceptor. The pressure in the chamber was fixed at 760 Torr. The measured distributions showed high concentrations around the port set at 10% and high temperatures around the heater blocks set at 125 °C, as expected. When all blocks were set at 125 °C, CH4 temperature around one heater block was higher than others. The temperatures were confirmed with the thermocouples when CH4 was streamed at the same conditions." @default.
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- W2969411813 date "2019-09-13" @default.
- W2969411813 modified "2023-09-23" @default.
- W2969411813 title "Simultaneous measurement of CH4 concentration and temperature distributions in a semiconductor process chamber" @default.
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- W2969411813 doi "https://doi.org/10.1088/1361-6463/ab3c30" @default.
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