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    • 4. 发明授权
    • Gate pattern formation using a bottom anti-reflective coating
    • 使用底部抗反射涂层的栅格图案形成
    • US5963841A
    • 1999-10-05
    • US924370
    • 1997-09-05
    • Olov B. KarlssonChristopher F. LyonsMinh Van NgoScott A. BellDavid K. Foote
    • Olov B. KarlssonChristopher F. LyonsMinh Van NgoScott A. BellDavid K. Foote
    • H01L21/3213H01L21/302
    • H01L21/32139
    • A gate is formed on a semiconductor substrate by using a bottom anti-reflective coating (BARC) to better control the critical dimension (CD) of the gate as defined via a deep-UV resist mask formed thereon. The wafer stack includes a gate oxide layer over a semiconductor substrate, a polysilicon gate layer over the gate oxide layer, a SiON BARC over the conductive layer, a thin oxide film over the SiON BARC. The resist mask is formed on the oxide film. The SiON BARC improves the resist mask formation process. The wafer stack is then shaped to form one or more polysilicon gates by sequentially etching through selected portions of the oxide film, the BARC, and the gate conductive layer as defined by the etch windows in the resist mask. Once properly shaped, the remaining portions of the resist mask, oxide film and SiON BARC are removed.
    • 通过使用底部抗反射涂层(BARC)在半导体衬底上形成栅极以更好地控制通过形成在其上的深UV抗蚀剂掩模所限定的栅极的临界尺寸(CD)。 晶片堆叠包括半导体衬底上的栅极氧化物层,栅极氧化物层上的多晶硅栅极层,导电层上的SiON BARC,SiON BARC上的薄氧化物膜。 在氧化物膜上形成抗蚀剂掩模。 SiON BARC改进了抗蚀剂掩模形成过程。 然后通过依次蚀刻通过抗蚀剂掩模中由蚀刻窗口限定的氧化膜,BARC和栅极导电层的选定部分,将晶片堆叠成形以形成一个或多个多晶硅栅极。 一旦适当成形,就去除了抗蚀剂掩模,氧化膜和SiON BARC的其余部分。