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electrons will be pushed from the negative contact through the load to the positivecontact, where they will recombine with holes. This constitutes an electric current. In crystallinesilicon cells, the current generated by radiation of a particular spectral composition is directlyproportional to the irradiance [Book 2]. Some types of solar cell, however, do not exhibit thislinear relationship. The silicon solar cell has many advantages such as high reliability, photovoltaic powerplants can be put up easily and quickly, photovoltaic power plants are quite modular and canrespond to sudden changes in solar input which occur when clouds pass by. However there arestill some major problems with them. They still cost too much for mass use and are relativelyinefficient with conversion efficiencies of 20% to 30%. With time, both of these problems willbe solved through mass production and new technological advances in semiconductors.