Patent ID: 6927155

Claim:
A process for producing a III-V nitride semiconductor layer ( 3 ), in particular based on GaN, comprising: a) providing a substrate ( 1 ) made from a material which is not based on III-V nitride semiconductors; b) applying a mask layer ( 2 ) to the substrate ( 1 ) in order to form unmasked regions ( 2 c ) and masked regions ( 2 a , 2 b ) on the substrate, the mask layer comprising a material which substantially does not allow crystal growth of a III-V nitride semiconductor layer; and c) growing a III-V nitride semiconductor layer ( 3 ) starting from the unmasked regions ( 2 c ) of the substrate ( 1 ), wherein the mask layer ( 2 ) is formed on the substrate ( 1 ) in such a manner that some of the masked regions ( 2 b ) are so wide that in step c) the III-V nitride semiconductor layer ( 3 ) is prevented from growing together over these wide masked regions ( 2 b ), whereas the III-V nitride semiconductor layer does grow together over the other, narrow masked regions ( 2 a ).