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Charge Carrier Injection from Electrical Contacts

When you can measure what you are speaking about, and express it in number, you know something about it; but when you cannot measure it, when you cannot express it in number, your knowledge is of a meager and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your own thoughts, advanced to the state of science.

William Thomson, Lord Kelvin

An electrical contact is generally referred to as a contact between a metal and a nonmetallic material, which may be an insulator or a semiconductor. Its function is either to enable or to block carrier injection. Contacts such as metal–electrolyte contacts, electrolyte–insulator, or electrolyte–semiconductor contacts ...

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