Patent ID: 8994002
Filing Date: 2015-03-31
Classification: H01L

Abstract:
1. A fin field effect transistor (FinFET) device, comprising: a superlattice layer disposed over a fin portion of a substrate, the superlattice layer comprising alternating first semiconductor layers and second semiconductor layers, the first semiconductor layers each having a first atomic composition, and the second semiconductor layers each having a second atomic composition different from the first atomic composition, the substrate having a third atomic composition in the fin portion, the first atomic composition and the second atomic composition each being different from the third atomic composition, at least one of the first semiconductor layers or the second semiconductor layers being relaxed; and a strained layer disposed over the superlattice layer and providing a gate channel, the gate channel stressed by a lattice mismatch with at least one of the first semiconductor layers or the second semiconductor layers of the superlattice layer.