Patent ID: 7560351

Claim:
A transistor comprising: a semiconductor substrate; a connection region containing a metal, the connection region of the transistor having a plurality of partial regions being in electrical communication with each other; a monocrystalline semiconductor between the substrate and the connection region, the monocrystalline semiconductor of the transistor having a plurality of partial regions being in electrical communication each other; and an electrically insulating insulation layer containing a cutout leading to the substrate, the cutout containing the monocrystalline semiconductor, the cutout having a cross-sectional area parallel to a surface of the substrate of less than 0.25 μm 2 , wherein: a transition layer parallel to a surface of the substrate between the substrate and the connection region is penetrated by at least one of the plurality of partial regions of the monocrystalline semiconductor and by the plurality of partial regions of the connection region, the transition layer has a thickness of greater than about 10 nm, the transition layer being located with a cavity defined by the cutout, the at least one of the plurality of partial regions of the monocrystalline semiconductor are completely surrounded by the metal in the transition layer and the at least one of the partial regions of the connection region are completely surrounded by the monocrystalline semiconductor in the transition layer, and trenches containing the metal are cut out in the monocrystalline semiconductor, at least one trench has a depth that is at least twice as large as a lateral dimension of the at least one trench.