A crystallization method and system are provided which improve a crystallization process by deciding a best-fit focal plane for a laser beam using a test mask and then applying the decided best-fit focal plane to the crystallization process. The three-layer structure includes a polyester film as a base material of the three-layer structure, a polyimide-based resin layer as a top layer of the three-layer structure, and another polyimide-based resin layer as a bottom layer of the three-layer structure. Since the stabilizing member includes a protruding portion to support the storage electrode and an adjacent storage electrode, all of the storage electrodes in a unit cell of a semiconductor device are structured to prevent a collapse. A particular length is chosen to maximize a probability that the predicting is correct.