Patent ID: 11916167
Assignee: OSRAM OPTO SEMICONDUCTORS GMBH
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A method for producing an optoelectronic semiconductor chip comprising:
A) providing a semiconductor layer sequence on a substrate, wherein the semiconductor layer sequence, starting from the substrate, comprises a first semiconductor layer of a first conductivity type, an active layer, and a second semiconductor layer of a second conductivity type in this order, wherein the active layer generates or absorbs electromagnetic primary radiation during intended operation and wherein the semiconductor layer sequence comprises a radiation side which is configured for coupling in or coupling out the primary radiation into or out of the semiconductor layer sequence and which is smooth within the manufacturing tolerance;
B) structuring a rear side of the semiconductor layer sequence facing away from the substrate, wherein scattering structures are formed which are configured for scattering and redirecting the primary radiation;
C) forming a first contact structure and a second contact structure, wherein—the second contact structure is arranged on the rear side and is brought into electrical contact with the second semiconductor layer, —the first contact structure is brought into electrical contact with the first semiconductor layer, —after the step B), a mirror is formed on the rear side, which is specular for the primary radiation generated or absorbed in the active layer, —after step B) and before the mirror is applied, a planarization layer is arranged on the structured rear side, —the planarization layer comprises a dielectric material, —the planarization layer is initially applied in such a thickness that it is thicker than the maximum height of the scattering structures of the rear side, —the planarization layer is subsequently polished until the side of the planarization layer facing away from the semiconductor layer sequence is smooth within the manufacturing tolerance.