Patent ID: 8129260

Claim:
A method of manufacturing a semiconductor substrate, the method comprising: preparing a growth substrate; crystal-growing a first semiconductor layer on the growth substrate using II-VI-group semiconductor material, III-V-group semiconductor material, or II-VI-group semiconductor material and III-V-group semiconductor material; forming a plurality of amorphous regions in a top surface of the first semiconductor layer, the plurality of amorphous regions being surrounded by a crystalloid region of the first semiconductor layer in order to expose a top surface of the plurality of amorphous regions; and forming a second semiconductor layer on the first semiconductor layer using the plurality of amorphous regions as a mask to suppress crystal growth of the second semiconductor layer from the plurality of amorphous regions of the first semiconductor layer and the crystalloid region as a seed to support crystal growth of the second semiconductor layer from the crystalloid region of the first semiconductor layer; wherein the second semiconductor layer has a lower defect density than the first semiconductor layer, wherein forming the plurality of the amorphous regions includes, forming a mask layer on the first semiconductor layer, the mask layer including one or more patterns, etching an exposed top surface of the first semiconductor layer according to the mask layer by applying ion bombardment, the exposed top surface of the first semiconductor layer being the plurality of the amorphous regions, and removing the mask layer, and wherein the ion bombardment includes ions from one or more of boron (B), phosphorus (P), arsenic (As), antimony (Sb), boron fluoride (BF 2 ), indium (In) and zinc (Zn).