Patent ID: 11923454
Assignee: GLOBALWAFERS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An epitaxial structure having super-lattice laminates, comprising:
a substrate;
a lower super-lattice laminate disposed on the substrate; wherein the lower super-lattice laminate includes: a plurality of first lower film layers and a plurality of second lower film layers stacked alternately with each other, each of the first lower film layers includes aluminum nitride (AlN), and each of the second lower film layers includes aluminum gallium nitride (AlGaN);
a middle super-lattice laminate disposed on the lower super-lattice laminate; wherein the middle super-lattice laminate includes: a plurality of first middle film layers and a plurality of second middle film layers stacked alternately with each other, each of the first middle film layers includes aluminum nitride (AlN), and each of the second middle film layers includes gallium nitride doped with a doping material (doped-GaN); wherein an initial doping concentration of doping concentrations in the plurality of second middle film layers including the doped-GaN along a thickness growth direction is a maximum doping concentration, and the doping concentrations in the plurality of second middle film layers including the doped-GaN decrease from the maximum doping concentration along the thickness growth direction;
an upper super-lattice laminate disposed on the middle super-lattice laminate; wherein the upper super-lattice laminate includes: a plurality of first upper film layers and a plurality of second upper film layers stacked alternately with each other, each of the first upper film layers includes gallium nitride doped with the doping material (doped-GaN), and each of the second upper film layers includes gallium nitride (un-doped GaN); wherein doping concentrations in the plurality of first upper film layers including the doped-GaN exhibit a substantially constant value and gradual changes, and a maximum doping concentration repeatedly appears in the plurality of the first upper film layers including the doped-GaN; and
a channel layer disposed on the upper super-lattice laminate; wherein the channel layer includes gallium nitride (un-doped GaN);
wherein the doping material of the gallium nitride (doped-GaN) is at least one material selected from a group consisting of carbon (C), iron (Fe), manganese (Mn), magnesium (Mg), vanadium (V), chromium (Cr), beryllium (Be), and boron (B).