Patent ID: 9653285
Date: 2017-05-16
CPC Classifications: H01L

Claim:
1. A semiconductor structure comprising: a semiconductor substrate portion comprising a first semiconductor material having a first lattice constant; a plurality of first semiconductor-containing pillar structures comprising a second semiconductor material having a second lattice constant that is greater than said first lattice extending upwards from a surface of said semiconductor substrate portion; a plurality of second semiconductor-containing pillar structures comprising a third semiconductor material having a third lattice constant that is greater than said first lattice constant extending upwards from another surface of said semiconductor substrate portion; a dielectric spacer laterally separating each first semiconductor-containing pillar structure from each second semiconductor-containing pillar structure, wherein each of said second semiconductor-containing pillar structures has a width that is different from a width of each of said first semiconductor-containing pillar structures; wherein said second semiconductor material and said third semiconductor material each comprises a lower portion having a first defect density and an upper portion having a second defect density that is less than the first defect density; further comprising a dielectric cap portion located on a topmost surface of each first semiconductor-containing pillar structure, wherein a topmost surface of said dielectric cap portion is coplanar with a topmost surface of each second semiconductor-containing pillar structure and a topmost surface of each dielectric spacer; and wherein each of said second semiconductor-containing pillar structures has a height that is greater than a height of each of said first semiconductor-containing pillar structures.