Method of optimizing seasoning recipe for etch process

• Main Authors: CHI KYEONG-KOO, CHO HONG, LEE CHEOL-KYU, KANG CHANG-JIN, JO HYE-JIN
• Format: Patent
• Language: English
• Published: 25.03.2004
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; SEMICONDUCTOR DEVICES

A method for optimizing a seasoning recipe for a dry etch process. The method includes setting a critical value of reproducibility, a main etch recipe, and a preliminary seasoning recipe. A test wafer is then etched using the preliminary seasoning recipe in a dry etch chamber. Next, a main etch process is performed with respect to at least 10 run wafers in the dry etch chamber using the main etch recipe and an end-point detection time for each wafer is determined. An initial dispersion and a standard deviation are then determined using the determined end-point detection times. The critical value of reproducibility is then compared to the initial dispersion. If the initial dispersion is equal to or less than the critical value of reproducibility, the preliminary seasoning recipe is used as the seasoning recipe, otherwise the preliminary seasoning recipe is modified and the process is repeated until an optimal seasoning recipe is determined.