Patent ID: 8450190
Filing Date: 2013-05-28
Classification: H01L

Abstract:
1. A method for semiconductor fabrication, comprising: growing a first semiconductor layer of a first semiconductor material on a substrate that is made of a substrate material different from the first semiconductor material; etching a top surface of the first semiconductor layer to create one or more etch pits on the top surface extending into the first semiconductor layer, wherein one or more defects are present underneath each etch pit inside the first semiconductor layer; depositing a passivation layer of a passivation material on the top surface to cover exposed areas of the top surface and the one or more etch pits to cover space above the one or more defects in each etch pit; thinning down the passivation layer to remove some of the passivation material to expose at least part of the top surface while leaving the space above the one or more defects in each etch pit covered by the passivation layer; and after the thinning down, growing the first semiconductor material or a semiconductor material compatible with the first semiconductor material over exposed areas of the first semiconductor layer to form a second semiconductor layer that covers the top surface and the one or more etch pits which are covered by the passivation layer to block extension of a defect in the first semiconductor layer into the second semiconductor layer.