Patent ID: 9406536
Filing Date: 2016-08-02
CPC Classification: C23C,C30B,H01L

Claim Text:
1. A method for manufacturing semiconductor epitaxy structure comprising: providing a substrate which is monitored in real time by a curvature monitor system to get a curvature value; depositing a buffer layer on the substrate, wherein thermal expansion coefficient and lattice constant of the buffer layer and the substrate are different so that the semiconductor epitaxy structure has a first strain to curve toward a first direction and the curvature monitor system monitors the curvature value of the semiconductor epitaxy structure in real time to determine whether stop depositing the buffer layer or not; depositing a first epitaxy layer on the buffer layer, wherein thermal expansion coefficient and lattice constant of the first epitaxy layer and the buffer layer are different so that the semiconductor epitaxy structure has a second strain to curve toward a second direction and the curvature monitor system monitors the curvature value of the semiconductor epitaxy structure in real time to determine whether stop depositing the first epitaxy layer or not; depositing an insertion layer on the first epitaxy layer, wherein thermal expansion coefficient and lattice constant of the insertion layer and the first epitaxy layer are different so that the semiconductor epitaxy structure has a third strain to curve toward the first direction and the curvature monitor system monitors the curvature value of the semiconductor epitaxy structure in real time to determine whether stop depositing the insertion layer or not; and depositing a second epitaxy layer on the insertion layer, wherein thermal expansion coefficient and lattice constant of the second epitaxy layer and the insertion layer are different so that the semiconductor epitaxy structure has a fourth strain to curve toward the second direction and the curvature monitor system monitors the curvature value of the semiconductor epitaxy structure in real time to determine whether stop depositing the second epitaxy layer or not.