Patent ID: 11972947
Assignee: NATIONAL UNIVERSITY CORPORATION TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C | IPC C  H

Claim 4:
5. A semiconductor laminate film comprising:
a silicon substrate; and
a semiconductor layer formed on the silicon substrate and containing silicon and germanium,
the semiconductor layer having a surface roughness Rms of 1 nm or less,
the semiconductor layer being lattice-matched with the silicon substrate such that a lattice mismatch rate of the semiconductor layer is 0%,
the semiconductor layer satisfying a following relationship
t<0.881×x−4.79 
where t represents a thickness (nm) of the semiconductor layer, and x represents a ratio of the number of germanium atoms to a sum of the number of silicon atoms and the number of germanium atoms in the semiconductor layer, and
a ratio of a number of germanium atoms to a sum of a number of silicon atoms and the number of germanium atoms in the semiconductor layer being 0.313 or more.