Semiconductor devices

A semiconductor device comprising:

• a first substrate including a first side and a second side that are opposite to each other in a first direction;
• a lower pattern on the first side of the first substrate, the lower pattern extending in a second direction that intersects the first direction;
• a field insulating film on the first side of the first substrate and on a side wall of the lower pattern;
• a plurality of sheet patterns which are spaced apart from each other in the first direction on the lower pattern;
• a gate electrode surrounding portions of the plurality of sheet patterns on the first side of the first substrate, the gate electrode extending in a third direction;
• a source/drain pattern which is on one side of the gate electrode and connected to the plurality of sheet patterns;
• a power rail on the second side of the first substrate and extending in the second direction;
• a via pattern which extends through the first substrate and the field insulating film in the first direction, and is connected to each of the power rail and the source/drain pattern;
• a first insulating film on the first side of the first substrate;
• a first dummy pattern arranged in the first insulating film, the first dummy pattern including an insulating material that is a different material than a material included in the first insulating film;
• a second substrate which includes, on the first dummy pattern, a third side that faces the first side, and a fourth side that is opposite to the third side in the first direction;
• a second insulating film on the third side of the second substrate;
• and
• a second dummy pattern in the second insulating film and including an insulating material that is different from a material included in the second insulating film,
• wherein the first dummy pattern and the second dummy pattern are offset in the first direction.

A semiconductor device comprising:

• a first substrate which includes a first side and a second side that are opposite to each other in a first direction;
• a plurality of lower patterns which extend in a second direction on the first side of the first substrate, and are spaced apart from each other in a third direction;
• a field insulating film on side walls of the plurality of lower patterns, on the first side of the first substrate;
• a plurality of sheet patterns which are spaced apart from each other in the first direction, on the plurality of lower patterns;
• a plurality of gate electrodes which surround portions of the plurality of sheet patterns on the first side of the first substrate, extend in the third direction, and are spaced apart from each other in the second direction;
• a plurality of source/drain patterns which are between the plurality of gate electrodes, each of the plurality of source/drain patterns connected to at least one of the plurality of sheet patterns;
• a plurality of source/drain contacts which are on each of the plurality of source/drain patterns;
• a power rail which is on the second side of the first substrate and which extends in the second direction;
• a plurality of via patterns which extend through the first substrate and the field insulating film in the first direction, and are connected to each of the power rail and the plurality of source/drain patterns;
• a first insulating film on the first side of the first substrate;
• a first dummy pattern which extends through the first insulating film, and includes an insulating material that is different from a material included in the first insulating film;
• a first adhesive film which covers the first insulating film and the first dummy pattern;
• a second substrate which includes, on the first dummy pattern, a third side that faces the first side, and a fourth side opposite to the third side in the first direction;
• a second insulating film on the third side of the second substrate;
• a second dummy pattern which extends through the second insulating film, and includes an insulating material that is a different material from a material included in the second insulating film;
• and
• a second adhesive film which covers the second insulating film and the second dummy pattern,
• wherein the first adhesive film is bonded to the second adhesive film,
• wherein each of the first dummy pattern and the second dummy pattern has at least one of a circular shape, a quadrangular shape, and a bar shape when viewed in a plan view,
• wherein the first dummy pattern and the second dummy pattern overlap each other in the first direction,
• wherein the first insulating film and the second insulating film include the same material, and
• wherein the first dummy pattern and the second dummy pattern include the same material.