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Tasatec
Tasatec
Application Notes

Rapid Thermal Processing (RTP)

ByAdmin 16 August 202216 August 2022

แก๊สต่างๆที่นำมาใช้ในงาน RTP ไม่ว่าจะเป็น อาร์กอน ไฮโดรเจน ออกซิเจน ไนโตรเจน ไนตรัสออกไซด์ กรดไฮโดรคลอริก และแอมโมเนีย ต่างก็ต้องมีความบริสุทธิ์สูง หรือ มีสิ่งเจือปนน้อยๆนั่นเอง และ Impurity ของแก๊สเกือบทุกชนิด ก็คือออกซิเจน ที่จะต้องมีการ monitor และควบคุม ในระหว่างกระบวนการ RTP

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In Rapid Thermal Processing (RTP) of semiconductor wafers, different metal compounds, such as tungsten, cobalt, platinum, aluminum, or gallium, can be deposited onto the wafer by essentially baking the wafer in the presence of different gases.  A semiconductor wafer is placed in front of high powered heat lamps bringing the temperature from 400°C to 1200°C.  The deposition of these different compounds will make the semiconductor wafer perform different operations.  The gases used include, but are not limited to, argon (Ar), hydrogen (H2), oxygen (O2), nitrogen (N2), nitrous oxide (N2O), hydrochloric acid (HCl), and ammonia (NH3).

Oxygen analyzers are used to detect trace amounts of oxygen within these gas components.  The presence of oxygen can cause the metal deposits to oxidize forming a new compound with poor conductive properties.  Yet in some applications, high concentrations of oxygen are used to increase the oxidation process because the metal oxide is a better conductor.  Oxygen analysis is performed in two areas.  First, oxygen analysis is sometimes performed on the gas supply before entering the RTP apparatus where ppb to low ppm levels of oxygen are needed.  Second, it is essential to analyze oxygen inside the wafer processing area.  This is commonly done by testing the exhaust gas from the RTP equipment.  The oxygen levels for this application are generally in the 10-100ppm region.

In the first application, monitoring the gas supply lines, the 176 or the 276 is recommended.  Generally, this is a continuous monitoring at low levels and response time is not a factor.   It should be noted that some gases are not suitable for these instruments, hydrochloric acid for example.  Response time in the second application is vital.  The faster the response time, the better.  Therefore, the Series 800 is generally used.  Again, gases not suitable for this instrument include hydrogen and hydrochloric acid.

วันนี้ เราไม่ต้องอาศัย wet cell ในการจะวัดออกซิเจนในช่วง 0-10 ppm อีกแล้ว เพราะเทคโนโลยี Sensor แบบ electrochemical นั้นสามารถให้ความละเอียดและแม่นยำได้ดี และที่สำคัญ ดูแลรักษาง่ายกว่า และทนทานกว่า ซึ่งในงาน RTP นั้นเราจะหลีกเลี่ยงไฮโดรเจนและกรดไฮโดรคลอริกที่เป็น by-product ของกระบวนการได้ยาก ออกซิเจนเซ็นเซอร์ที่จะนำมาใช้กับงานลักษณะนี้จึงต้องเป็นเซ็นเซอร์ที่มีคุณสมบัติพิเศษ เชิญปรึกษาทีมวิศวกรรมของทาซาเทค ได้ตามช่องทางที่สะดวกเลยนะคะ

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Post Tags: #RTP

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