Patent ID: 9093604
Filing Date: 2015-07-28
Classification: H01L,H01S

Abstract:
1. A method of producing an optoelectronic semiconductor chip having a semiconductor layer stack based on a material system AlInGaP comprising: preparing a growth substrate having a silicon surface which is a surface of a silicon growth substrate, applying a nucleation layer directly to the silicon surface, wherein the nucleation layer is a GaP layer, an AlGaP layer or an AlP layer, applying an intermediate layer directly to the nucleation layer, said intermediate layer being pseudomorphic with respect to silicon and based on GaAlInPAs and comprising Ga, Al, In, P and As, arranging a compressively relaxed buffer layer stack of GaAlInPAs comprising Ga, Al, In, P and As directly on the intermediate layer such that the lattice constant of the buffer layer stack increases gradually in a direction towards the semiconductor layer stack so that virtually all dislocations resulting from a lattice mismatch between the intermediate layer and the semiconductor layer stack are enclosed in the relaxed buffer layer stack so that no dislocations or strains occur in the semiconductor layer stack, and metamorphically, epitaxially growing the semiconductor layer stack directly on the buffer layer stack, wherein the semiconductor layer stack has an active layer that generates radiation, and wherein the lattice constant of the buffer layer stack is increased by addition of arsenic.