Patent ID: 7638414
Filing Date: 2009-12-29
Classification: H01L

Abstract:
1. A method of forming a nitride semiconductor layer on a patterned substrate, comprising: preparing a patterned substrate having a pattern of protrusions and recess regions; forming a nucleation layer on the patterned substrate; forming a first 3D growth layer on the substrate having the nucleation layer by growing a nitride semiconductor layer in a 3D growth condition; forming a first 2D growth layer on the first 3D growth layer by growing a nitride semiconductor layer in a 2D growth condition; forming a second 3D growth layer on the first 2D growth layer by growing a nitride semiconductor layer in a 3D growth condition; and forming a second 2D growth layer on the second 3D growth layer by growing a nitride semiconductor layer in a 2D growth condition, wherein the 3D growth condition for growing the first 3D growth layer is set to have a substrate temperature (T1) in the range of 600˜1,200° C. and a chamber pressure (P1) in the range of 10˜760 mbar; wherein the 2D growth condition for growing the first 2D growth layer is set to have a substrate temperature (T2) higher than T1 and a chamber pressure (P2) lower than P1; wherein the 3D growth condition for growing the second 3D growth layer is set to have a substrate temperature (T3) lower than T2 and a chamber pressure (P3) higher than P2; and wherein the 2D growth condition for growing the second 2D growth layer is set to have a substrate temperature (T4) higher than T3 and a chamber pressure (P4) lower than P3.