Some common solid state devices: Solid state devices are the devices which carry solid material, with electron and other charges. Transistor, microprocessor chip and DRAM are some common solid state devices. The recent and further examples of solid state devices are integrated circuits, LED and LCD.

In solid state devices, the components are consisting of two forms, negative and positive. Negative are called electron and positive current is called electron holes.


A semiconductor is a material that produces electrical transference between conductor and insulator. Semiconductor mostly deal with electron and in other, it deals with electron holes. Both are called charge carrier. Some are very good conductor, e.g. metal and some are having very low conductor for example wood, diamond .Although these devices are much faster for data storage purpose but these are expensive too.

First solid state device in 1930

Cat whisker detector was a first solid state device in 1930. Later on, the solid state devices were developed in 1947 by the invention of transistor Diode application was used in radio for catching signal before the invention of semiconductor. Semiconductors are based mostly on silicon and are suitable for the circuit. It is also found commonly on earth and is in readily formed. . This article will show how conductor and semiconductor operate when principles applied on these devices.