| 摘要 |
An embodiment of a method for manufacturing a power device integrated on a semiconductor substrate comprising the steps of: growth on said substrate of an epitaxial layer; photo-lithography and etching of said epitaxial layer for the formation of at least one deep trench; deposition of a dielectric layer with partial filling of the at least one trench; complete filling of the at least one trench with a layer of sacrificial material; selective etching of the dielectric layer with consequent retrocession below the layer of sacrificial material; selective etching of the layer of sacrificial material with consequent formation of an empty region within the at least one trench; growth of a layer of gate oxide; formation of at least one gate region, of at least one buried source region, of at least one body region and of at least one source region; deposition of a dielectric layer; simultaneous formation of at least one gate contact, at least one body/source contact and at least one buried source contact; formation of a source contact region and of a gate contact region through deposition, masking and etching of a metallisation layer. An embodiment of the method also comprises the step of formation of the at least one gate region and of the at least one buried source region, electrically insulated, through a single deposition of a conductive filling material on the epitaxial layer, on the vertical walls of the trench and within the empty region; and through etching of the conductive filling material forming a first spacer and a second spacer, suitable for serving as a gate electrode and forming a buried source electrode within the empty region. |
