Patent ID: 8451078

Claim:
A CMOS (complementary metal-oxide-semiconductor)—MEMS (microelectromechanical system) switch structure, comprising: a first substrate and a second substrate located opposite each other; a first cantilever beam extending from the first substrate toward the second substrate, the first cantilever beam comprises a first structural layer formed on the first substrate, and a second structural layer formed on the first structural layer and having a top surface serving as the first top surface, wherein the first structural layer and the second structural layer are made of different materials such that a residual stress is generated between the first structural layer and the second structural layer and causes the first cantilever beam to bend downward; and a second cantilever beam extending from the second substrate toward the first substrate, the second cantilever beam comprises: a third structural layer formed on the second substrate, and a fourth structural layer formed on the third structural layer and having a top surface serving as the second top surface, wherein the third structural layer and the fourth structural layer are made of different materials such that a residual stress is generated between the third structural layer and the fourth structural layer and causes the second cantilever beam to bend downward, wherein the first substrate and the second substrate are movable toward each other to connect the first top surface and the second top surface, and the first substrate and the second substrate are movable away from each other so that the first top surface and the second top surface are disconnected.