Patent ID: 9680021
Date: 2017-06-13
CPC Classifications: H01L

Claim:
1. A fin field effect transistor (FinFET) comprising: a substrate; a fin structure protruding from the substrate, the fin structure comprising one or more semiconductor layers, each of the one or more semiconductor layers having a different lattice constant than an immediately underlying layer, wherein the one or more semiconductor layers comprises a first semiconductor layer, the first semiconductor layer being a first silicon germanium layer; an isolation region adjacent opposing sidewalls of the fin structure, the fin structure having an upper portion extending above the isolation region, the upper portion having slanted sidewalls; a first passivation layer interposed between the fin structure and the isolation region; a second passivation layer on the upper portion of the fin structure, wherein the second passivation layer extends over sidewalls and an upper surface of the first semiconductor layer, the second passivation layer being a silicon germanium oxynitride layer; and a gate structure overlying the upper portion of the fin structure.