Economy of New York City bank with a permanent vote on the Federal Open Market Committee and its president is traditionally selected as the Committee's vice chairman. The bank also has the largest gold repository in the world, larger even than Fort Knox. Its vault is 80 feet (25 m) beneath the street and holds $160 billion worth of gold bullion. Silicon Alley, centered in Manhattan, has evolved into a metonym for the sphere encompassing the New York City metropolitan region's high tech enterprises involving the Internet, new media, telecommunications, digital media, software development, biotechnology, game design, and other fields within information technology that are
Polycrystalline silicon grain boundaries, see figure 1. The resistivity, mobility, and free-carrier concentration in monocrystalline silicon vary with doping concentration of the single crystal silicon. Whereas the doping of polycrystalline silicon does have an effect on the resistivity, mobility, and free-carrier concentration, these properties strongly depend on the polycrystalline grain size, which is a physical parameter that the material scientist can manipulate. Through the methods of crystallization to form polycrystalline silicon, an engineer can control the size of the polycrystalline grains which will vary the physical properties of the material. The use of polycrystalline silicon in the production of solar cells requires