Patent ID: 7700461

Claim:
A method of forming a semiconductor device, comprising: forming a string structure including a selection transistor and a memory cell on a substrate; forming an insulation layer pattern on the substrate to cover the string structure, the insulation layer pattern including at least one opening exposing a portion of the substrate adjacent to the selection transistor; forming a seed layer including a single-crystalline material in the opening; forming an amorphous thin film including an amorphous material on the insulation layer pattern and the seed layer; and transforming the amorphous thin film into a single-crystalline thin film, using the single-crystalline material in the seed layer as a seed during a phase transition of the amorphous thin film, to provide a channel layer on the insulation layer pattern and the seed layer, wherein transforming comprises: changing a phase of a first region of the amorphous thin film, the first region of the amorphous thin film being overlapped with the seed layer; transforming the first region of the amorphous thin film into a first single-crystalline thin film including the single-crystalline material, by converting a crystalline structure of the first region of the amorphous thin film into a single-crystalline structure, using the single-crystalline material in the seed layer as the seed during a phase transition of the first region of the amorphous thin film; changing a phase of a second region of the amorphous thin film, the second region of the amorphous thin film being laterally adjacent to the first single-crystalline thin film; and transforming the second region of the amorphous thin film into a second single-crystalline thin film including the single-crystalline material, by converting a crystalline structure of the second region of the amorphous thin film into a single-crystalline structure, using the single-crystalline material in the first single-crystalline thin film as the seed during a phase transition of the second region of the amorphous thin film, and wherein the first region of the amorphous thin film has an area substantially larger than that of the second region of the amorphous thin film.