New York (state) States, while Midtown Manhattan is the largest central business district in the nation. Silicon Alley, centered in New York City, has evolved into a metonym for the sphere encompassing the New York City metropolitan region's high technology and entrepreneurship ecosystem; in 2015, Silicon Alley generated over US$7.3 billion in venture capital investment. High tech industries including digital media, biotechnology, software development, game design, and other fields in information technology are growing, bolstered by New York City's position at the terminus of several transatlantic fiber optic trunk lines, its intellectual capital, as well as its growing outdoor wireless connectivity. In December
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