Patent ID: 7560341

Claim:
A manufacturing method for a semiconductor device including a semiconductor substrate and a plurality of electronic elements formed on said semiconductor substrate, each of said electronic elements having an electrode and a dielectric film interposed between said semiconductor substrate and said electrode, said dielectric films of said electronic elements having different electrical effective film thicknesses required, said manufacturing method comprising the steps of: forming said dielectric film on said semiconductor substrate; forming an amorphous semiconductor layer on said dielectric film; converting said amorphous semiconductor layer into a polycrystalline semiconductor layer so that said polycrystalline semiconductor layer has a plurality of regions having different average grain sizes so as to respectively correspond to said plurality of electronic elements; and processing said polycrystalline semiconductor layer to form a plurality of polycrystalline electrodes from said regions having said different average grain sizes, wherein, said converting step comprises the steps of: directing light having a predetermined energy to said amorphous semiconductor layer at a region thereof corresponding to said electronic element whose dielectric film has a larger electrical effective film thickness to thereby melt said amorphous semiconductor layer at said irradiated region and solidify said melted amorphous semiconductor layer at said irradiated region in a planar direction, thereby converting said irradiated region of said amorphous semiconductor layer into a first polycrystalline semiconductor layer having a larger average grain size, and annealing said amorphous semiconductor layer to thereby convert an unirradiated region of said amorphous semiconductor layer into a second polycrystalline semiconductor layer having a smaller average grain size.