Patent ID: 8377315

Claim:
A method for manufacturing a porous microstructure in a silicon semiconductor substrate, comprising: a) applying and structuring a masking layer on an external surface of a front side of a silicon semiconductor substrate, discrete holes having a mean diameter in the range of ≧0.1 μm to ≦500 μm being formed in the masking layer; b) producing recesses in a silicon semiconductor substrate, the recesses each defining a substructure of the porous microstructures; c) removing the masking layer; d) applying and structuring a sacrificial layer, the sacrificial layer having discrete through holes having a diameter in the range of ≧0.1 μm to ≦150 μm, which are each situated centrally in the recesses; e) applying a silicon layer, the silicon layer filling up the recesses and forming a layer above the sacrificial layer; f) porosifying the silicon layer; g) applying and structuring a further masking layer on the porosified silicon layer, the further masking layer covering areas above the recesses, which form a further substructure of the porous microstructures; h) anisotropic etching the porosified silicon layer; i) removing the further masking layer; j) removing the sacrificial layer; and k) detaching or separating the porous microstructures.