Patent ID: 7112495

Claim:
A method of forming a semiconductor chip, the method comprising: providing a semiconductor region comprising a first semiconductor material with a first natural lattice constant; forming first and second active regions in the semiconductor region; forming a first gate stack over the second active region; forming first spacers adjacent the first gate stack; forming a masking layer over the first active region; after forming the masking layer, forming at least one recess in a portion of the second active region not covered by the first gate stack; forming a second semiconductor material in the at least one recess to substantially fill the at least one recess, the second semiconductor material having a second natural lattice constant that is different than the first natural lattice constant; forming heavily-doped source and drain regions in the second active region on opposing sides of the first gate stack; removing the first spacers after the forming heavily-doped source and drain regions; forming lightly-doped drains after the removing the first spacers on opposing sides of the first gate stack; removing the masking layer; and forming a semiconductor component in the first active region.