Ryan, Mason & Lewis, LLP
Methods and structures for forming a tight pitch structure
A method for manufacturing a semiconductor device includes forming a plurality of amorphous silicon germanium (a-SiGe) structures having a first percentage of germanium on a substrate, forming a plurality of spacers on sides of the plurality of a-SiGe structures, performing an annealing to convert a portion of each of the a-SiGe structures into respective portions comprising a-SiGe having a second percentage of germanium higher than the first percentage of germanium, and to convert each of the spacers into respective silicon oxide portions, removing from the substrate at least one of: one or more unconverted portions of the a-SiGe structures having the first percentage of germanium, one or more of the converted portions of a-SiGe structures, and one or more of the silicon oxide portions, and transferring a pattern to the substrate to form a plurality of patterned substrate portions, wherein the pattern includes the portions remaining after the removing.
International Business Machines Corporation
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Juntao Kangguo Choonghyun Peng
Li Cheng Lee Xu