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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.
Materials that are composed of atoms with free electrons are good conductors. Electrical energy is conducted through a material by the transfer of energy from one electron to the next. Materials that are made of atoms with tightly bound electrons are good insulators. These materials have very few, if any, free electrons available to transfer energy. The ability of a material to conduct electrical energy is called conductivity. All metals have high conductivity and are good conductors, while rubber, plastic, ceramics and glass have low conductivity, making them the best insulators.