| 摘要 |
Pitch multiplied and non-pitch multiplied features of an integrated circuit, e.g., features in the array, interface and periphery areas of the integrated circuit, are formed by processing a substrate through a mask. A photoresist layer is patterned to simultaneously define mask elements in the array, interface and periphery areas. The pattern is transferred to an amorphous carbon layer. Spacers are formed on the sidewalls of the patterned amorphous carbon layer. Protective material is deposited and patterned to expose mask elements in the array region and in parts of the interface or periphery areas. Exposed amorphous carbon is removed, leaving free-standing spacers in the array region. The protective material is removed, leaving a pattern of pitch multiplied spacers in the array region and non-pitch multiplied mask elements in the interface and periphery areas. The pattern is transferred to a hard mask layer, through which the substrate is etched.
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