Media in New York City Journal News", which covers Westchester County, to the north along the Hudson River and "The Bergen Record" and "The Star-Ledger", of Newark which cover northern New Jersey across the New York Bay and Hudson River to the west. New York City's digital companies, sometimes described as "Silicon Alley", include both software companies and companies known primarily as content producers. Among the former are Tumblr (now owned by Yahoo!), FourSquare and AOL. Among the latter are Gawker Media, BuzzFeed, and some of AOL's holdings, including HuffPost and Weblogs, Inc. The satirical newspaper "The Onion" (online-only since 2013) was based in New
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