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The electrical properties of silicon can be changed or manipulated by adding up the other elements called “dopants” which determine the type of silicon wafer. Either negative or positive, and these dopants also modify the resistivity of silicon to make it more conductive. Therefore, we can say that the type of “dopant” added determines the final wafer. Whether it’s an N-Type or a P-Type silicon wafer. And the amount of dopant determines wafer’s final resistivity. P-Type silicon wafers are very common in terms of production and sales volume. These types of wafers are formed with only one type of dopant called boron. Amount of boron in the silicon wafer determines its resistivity; the less boron the more will be the resistivity while the more boron the lower resistivity. Visit here for more information - https://en.wikipedia.org/wiki/Extrinsic_semiconductor#N-type_semiconductors http://www.wafernet.com/p-type-silicon-wafers.htm

According to me Amsterdam and Copenhagen are the two cleanest and greenest cities in the world. They are most suitable and livable places on earth. These cities lay a great emphasis on bicycle riding which makes them pollution free up to a large extent. Copenhagen’s environmental policies are planned in such a way that their goal is to become carbon neutral by 2025. If you are really looking for serene and calm environment these cities can be your ultimate destination.