Patent ID: 9443742
Filing Date: 2016-09-13
CPC Classification: H01L

Claim Text:
1. A multiple patterning method for fabricating patterned features, comprising: providing a substrate having a first region and a second region; forming a sacrificial film on a surface of the substrate; forming a first mask film on a surface of the sacrificial film; forming a second mask film on a surface of the first mask film; and forming a plurality of first mask structures in the first region, and a plurality of second mask structures in the second region by etching the second mask film, the first mask film, and the sacrificial film until surface portions of the substrate respectively in the first region and the second region are exposed, wherein: the plurality of first mask structures in the first region includes at least two first mask structures each having a first critical dimension, and the plurality of second mask structures in the second region includes at least one second mask structure having a second critical dimension, the first critical dimension being smaller than the second critical dimension.