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dopant |
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dopantAny impurity added to a semiconductor to modify its electrical conductivity. The most common semiconductors, silicon and germanium, form crystalline lattices in which each atom shares electrons with four neighbours (see bonding). Replacing some atoms with donor atoms (e.g., phosphorus, arsenic) that have five bonding electrons makes extra electrons available. The semiconductor thus doped is called n-type (for negative, because of the additional negative charges). Doping with acceptor atoms (e.g., gallium), which have only three electrons available, creates “holes,” which are positively charged. Conduction can occur by migration of holes through the crystal structure of such a semiconductor, known as p-type (for positive). dopantAn element diffused into pure silicon in order to alter its electrical characteristics and make it more conductive. Boron, phosphorous, antimony and arsenic are common dopants. See doping. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Most interpretations of optical measurements on compound semiconductors such as GaSb require physical models and associated input parameters that describe how carrier densities vary with dopant concentrations and measured Fermi energies. For high energy implants, the VIISta 3000 provides additional accuracy in the placement of dopant species to enhance well-to-well isolation characteristics, reducing the size of the transistors and increasing the number of integrated circuits on the wafer. Chen and his colleagues at Rowland and the Chinese Academy of Sciences in Beijing, however, report a step toward finer dopant control. |
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