Patent ID: 7534669
Filing Date: 2009-05-19
Classification: H01L

Abstract:
1. A method of making at least one fin-type field effect transistor (FinFET) structure, said method comprising: forming a first fin structure and a second fin structure on a substrate, said first fin structure and said second fin structure having a same size and comprising an intrinsic material having relatively poor conductivity; forming first spacers adjacent to said first fin structure and second spacers adjacent to said second fin structure; removing a portion of said second spacers such that said first spacers and said second spacers have different heights and such that said first spacers cover a larger portion of the vertical sidewalls of said first fin structure when compared to the portion of the vertical sidewalls of said second fin structure covered by said second spacers; after said removing of said portion of said second spacers, performing a doping process that increases conductivity in a first area of said first fin structure not protected by said first spacers and in a second area of said second fin structure not protected by said second spacers and that further leaves any areas of said first fin structure and said second fin structure protected by said first spacers and said second spacers as said intrinsic material with relatively poor conductivity for functioning as an insulator, wherein, due to said different heights of said first spacers and said second spacers, said second area is larger than said first area such that an effective width of said second fin structure is larger than an effective width of first fin structure.