Patent ID: 9379226
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. A semiconductor wafer, comprising: a base wafer made of GaAs; a first crystalline layer; an insulating layer; and at least In wherein the base wafer, the first crystalline layer, and the insulating layer are positioned in an order of the base wafer, the first crystalline layer, and the insulating layer, the first crystalline layer is made of In the semiconductor wafer comprises a layer-stacked structure, the layer-stacked structure comprising a first spacer layer, a second spacer layer, the first crystalline layer, a third spacer layer, and a fourth spacer layer, with the layers comprised in the layer-stacked structure being stacked in a state order, the second and third spacer layers are made of GaAs layers, the first and fourth spacer layers are made of AlGaAs, and a photoluminescence peak wavelength of the first crystalline layer at 77 K is longer than 1080 nm.