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After the board surface is oxidized, a fluff layer (copper oxide and cuprous oxide) is formed.

Chip is a general term for semiconductor component products. In electronics, it is a method of miniaturizing circuits (mainly including semiconductor devices and passive components) and often manufactured on the surface of semiconductor wafers. Also known as integrated circuit, microcircuit, or micro

PCB is mainly composed of pad, through hole, mounting hole, wire, component, connector, filling

Every time through AI flash, Guojin Securities said that semiconductor equipment parts play an important role in the industrial chain, with a large number, a wide variety and obvious market fragmentation characteristics

A chip refers to a silicon chip containing integrated circuits, which is small in size and is a part of a mobile phone, computer, or other electronic device. If the most important organ of the human body is the brain, then chips are the "brain" of electronic devices. A chip is an integrated circuit, also known as a microelectronic chip, composed of many electronic devices, circuit components, organic matter, etc., packaged on a single silicon chip, and is one of the foundations of modern electronic technology. Because of its small size, low power consumption, high manufacturing difficulty, and high reliability

Why does the resistivity of semiconductor go down with temperature？Between the conductor and semiconductor resistivity difference is due to the different density of charge carriers.