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清洗製程介紹 (Wet Clean Process)

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  • 清洗製程介紹 (Wet Clean Process)

2023年01月19日

RCA Clean是一套基礎且通用的晶圓清洗步驟,Werner Kern 在 1965 年為美國無線電公司(RCA) 工作時開發的清洗步驟,主要是在半導體製造中的矽晶圓薄膜處理(氧化、擴散、CVD)之前執行。

◉清洗製程流程  

  • SC-1 (APM):去除有機污染物(有機物+顆粒清潔)
  • SC-2 (HPM):去除離子污染(ionic clean)
  • DHF:去除薄氧化層(氧化層)
  • BOE (Buffered Oxide Etch):緩衝氧化物刻蝕液 (HF / NH4F)
  • SPM (Piranha):高溫硫酸去光阻 (H2SO4 / H2O2 / H2O)

◉Standard Clean 1 (SC-1):有機物與顆粒去除

氨水、雙氧水、純水的混和液,在 70°C~80 °C 下清洗。這種鹼-過氧化物混合物可以去除了有機物殘留,顆粒也被有效地去除,甚至是不溶性顆粒,因為 SC-1 改變了表面和顆粒的電位並使它們相互排斥。

◉Standard Clean 2 (SC-2):離子汙染物去除

鹽酸、雙氧水、純水的混和液,在 120°C~140 °C下清洗。這種處理有效地去除了金屬(離子)污染物的殘留,並在晶圓表面留下一層薄鈍化層,保護表面免受後續污染。

◉DHF:氧化層去除

使用HF與水以1:50~1:100 比例稀釋成DHF溶液,在 25 °C下清洗,以去除薄氧化層和一些離子污染物。

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