Sickle Cell Anemia

Silicon is the raw material most often apply in integrated circuit (IC) fabrication. It is the second most immense substance on the earth. It is extracted from rocks and common beach sand and baffle through an exhaustive purification process. In this form, te is the purist industrial substance that man produces, with impurities comprising less than one part in a billion. That is the equivalent of one tennis ball in a string of golf balls stretching from the earth to the moon. Semiconductors ar usually materials which have energy-band gaps smaller than 2eV. An important property of semiconductor units is the world power to change their resistivity over several orders of magnitude by doping. Semiconductors have electrical resistivities between 10-5 and 107 ohms. Semiconductors can be gossamer or amorphous. Elemental semiconductors are simple-element semiconductor materials such as silicon or germanium. Silicon is the most common semiconductor material used today. It is used for diodes, transistors, integrated circuits, memories, infrared undercover work and lenses, light-emitting diodes (LED), photosensors, strain gages, solar cells, charge transfer devices, radiation detectors and a variety of other devices. Silicon belongs to the group IV in the periodic table.

It is a grey brittle material with a diamond cubic structure. Silicon is conventionally doped with Phosphorus, ratsbane and Antimony and Boron, Aluminum, and Gallium acceptors. The energy gap of silicon is 1.1 eV. This regard as permits the operation of silicon semiconductors devices at higher temperatures than germanium. Now I will give you some brief history of the organic evolution of electronics which will help you understand more about semiconductors and the silicon chip. In the early 1900s before integrated circuits and silicon chips were invented, computers and radios were do with vacuum tubes. The vacuum tube was invented in 1906 by Dr.Lee DeForest. end-to-end the first half of the...

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