Patent ID: 8288754

Claim:
A method for position-controlled fabrication of a semiconductor quantum dot (QD), the method comprising: providing a substrate of a substrate material and having a front substrate surface ( 102 . 1 ), an opposite back substrate surface ( 102 . 2 ), and an inner substrate region (I) extending from the front substrate surface to the back substrate surface; depositing a sacrificial layer ( 108 ) of a sacrificial material on the front substrate surface; depositing an active layer ( 110 ) of a semiconductive active material on the sacrificial layer, wherein the substrate, sacrificial and active materials are chosen such that the sacrificial layer is selectively removable with respect to the substrate and the active layer, depositing and patterning a mask layer ( 112 ) on the active layer so as to define desired quantum-dot positions in lateral directions, fabricating a lateral access to the sacrificial layer in regions underneath the patterned mask layer ( 112 ); selectively removing, with respect to the substrate and the active layer, the sacrificial layer from underneath the active layer at least under the patterned mask layer; etching the active layer under the patterned mask layer from underneath the active layer so as form the quantum dot with a convex second surface section, which is oriented towards the inner substrate (I).