➀ SiC and GaN, as third-generation semiconductors, have gained popularity due to their wide bandgap; ➁ The U.S. is investing heavily in ultra-wide bandgap (UWBG) semiconductor technology; ➂ DARPA has announced a contract with Raytheon to develop ultra-wide bandgap semiconductors using diamond and aluminum nitride; ➃ Element Six, a synthetic diamond material company, is leading a project under DARPA's UWBGS program to advance semiconductor technology; ➄ The U.S. government is investing in the development of UWBG semiconductors, including projects at North Carolina State University.