Patent ID: 9293640
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A method for producing an optoelectronic semiconductor chip, the method comprising: providing a growth substrate with a growth side; depositing a nucleation layer on the growth side, wherein the nucleation layer is based on Al depositing a first masking layer on the nucleation layer; structuring the first masking layer; growing a GaN-based seed layer only on the nucleation layer in regions not covered by the first masking layer; partially removing the seed layer in regions not covered by first the masking layer, and applying a second masking layer onto the seed layer in regions not covered by the first masking layer such that, when seen in top view, the second masking layer covers the seed layer only in part, and wherein regions of the seed layer not covered by the second masking layer form growth islands; forming cross-sectionally triangular, rhombical or trapezoidal regions starting from the growth islands; performing lateral overgrowth, continuing from the forming the cross-sectionally triangular, rhombical or trapezoidal regions and such that cross-sectionally larger, triangular growth structures are formed beginning from the cross-sectionally triangular, rhombical or trapezoidal regions; laterally overgrowing the growth structures to form a coalescence layer which covers the entire growth side; and growing, on the coalescence layer, an AlInGaN-based semiconductor layer sequence with at least one active layer; wherein the individual steps are performed in the stated sequence.