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Any of various solid substances, such as silicon or germanium, that conduct electricity more easily than insulators but less easily than conductors. Semiconductors are able to do this because they have a small number of electrons that have escaped from the bonds between the atoms, leaving open spaces.ny of various solid substances, such as silicon or germanium, that conduct electricity more easily than insulators but less easily than conductors. Semiconductors are able to do this because they have a small number of electrons that have escaped from the bonds between the atoms, leaving open spaces.
At the time, some thought that two wide-bandgap technologiesâgallium nitride (GaN) on silicon and silicon carbide (SiC) MOSFETsâwould displace the ubiquitous power MOSFET. In addition, GaN and SiC were supposed to pose a threat to higher-end, silicon-based insulated-gate bipolar transistors (IGBTs).hen, there are the two wide-bandgap technologiesâSiC and GaN. Based on silicon and carbon, SiC has a bandgap of 3.3 eV. Silicon has a bandgap of 1.1 eV. SiC FETs are targeted for 600-volt to 10-kilovolt applications.