Which of the following is NOT a characteristic of semiconductors?

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Semiconductors are materials whose electrical behavior can be precisely tuned, sitting between conductors and insulators. This tunability comes from the ability to alter charge carrier concentration through impurities—a process called doping—so you can control conductivity to build diodes, transistors, and other devices. They’re also abundant in nature; silicon, for example, is plentiful in the Earth’s crust and forms the basis of most electronic technology. The defining traits aren’t about aging; once engineered, the material’s ability to conduct and respond to dopants is stable under normal operating conditions. Aging or long-term wear isn’t a fundamental characteristic of semiconductors themselves, though devices can degrade for other reasons. Therefore, the statement that semiconductor properties change as materials age isn’t a characteristic of semiconductors.