Patent ID: 7262456

Claim:
A bit line structure comprising: a semiconductor substrate comprising a plurality of semiconductor components, each semiconductor component comprising a first doping region of a first conduction type and a second doping region of a second conduction type, wherein the first conduction type is opposite to the second conduction type; a bit line doping region of the second conduction type formed in the semiconductor substrate, the bit line doping region comprising at least one buried bit line electrically connected to the second doping regions of the plurality of semiconductor components; at least one isolation trench formed in the semiconductor substrate, the at least one isolation trench substantially parallel to the bit line and operative to insulate the bit line; a first surface insulating layer formed at the surface of the semiconductor substrate; a first surface bit line formed at the surface of the first surface insulating layer and electrically connected to the first doping regions of the plurality of semiconductor components via a first plurality of contacts; a second surface insulating layer formed at the surface of at least one of the first insulating layer or the first surface bit line; and a second surface bit line formed at the surface of the second surface insulating layer and electrically connected to the second doping regions of the plurality of semiconductor components via a second plurality of contacts; wherein the first surface bit line has an interruption in the region of the second plurality of contacts; wherein the at least one isolation trench comprises an electrically conductive trench filling layer formed at least in a region of the first and second plurality of contacts, the at least one isolation trench electrically connecting the first doping regions of the plurality of semiconductor components; and wherein the at least one isolation trench comprises a buried contact bypass line in the region of the first and second plurality of contacts that is an electrically conductive trench filling layer.