SEMICONDUCTOR DEVICE HAVING MULTI-CHANNEL AND METHOD OF FORMING THE SAME

A semiconductor device includes an isolation pattern on a substrate, the isolation pattern having a lower insulating pattern on the substrate, and a spacer to cover side surfaces of the lower insulating pattern, a vertical structure through the isolation pattern to contact the substrate, the vertical structure having a first semiconductor layer on the substrate, a lower end of the first semiconductor layer being at a lower level than a lower surface of the isolation pattern, a second semiconductor layer on the first semiconductor layer, and a third semiconductor layer on the second semiconductor layer, and a gate electrode crossing the vertical structure and extending over the isolation pattern. 种半导体器件包括：在衬底上的隔离图案，所述隔离图案具有在衬底上的下部绝缘图案，以及覆盖所述下部绝缘图案的侧表面的间隔物；穿过所述隔离图案以接触衬底的垂直结构，所述垂直结构具有在衬底上的第半导体层，第半导体层的下端在比所述隔离图案的下表面更低的高度，在第半导体层上的第二半导体层，以及在第二半导体层上的第三半导体层；以及与垂直结构交叉且在所述隔离图案上方延伸的栅电极。