How do Semiconductors Work?
Semiconductors are unique materials, solids whose electrical conductivity can be changed deliberately, usually in a dynamic (reversible) fashion. Semiconductors are used to make semiconductor devices, which led to the Information Age of the late 20th century. Today, semiconductors are ubiquitous, and continue to penetrate further into our daily lives. These devices include actuators and control systems in cars, MP3 players, cell phones, and computers of all kinds. Semiconductors are arguably one of the most important technologies of the 20th century, and continues to be a central aspect of developed economies. The most common semiconductors are made of silicon, as it is relatively cheap to extract from sand, and gets the job done. The semiconductor industry sells several hundred billion US Dollars of product per year. The first semiconductors were little detectors on radios popular around the beginning of the twentieth century. They were called “cat’s whiskers” and the semiconducting e
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