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As a device that converts solar energy into electrical energy directly,solar cell is an extremely promising replacement of the traditional sources of energy. The amorphous silicon(a-Si)film has been regarded as one of the most important materials used for solar cells and attracted considerable attention,because of its high absorption coefficient and low cost. Optical band gap(Eg)is a very important parameter of silicon films using for solar cells. In most cases,photons with energies equal to the Eg will be absorbed by photovoltaic materials and produce one electron-hole pair.
As a device that converts solar energy into electrical energy directly, solar cell is an extremely promising replacement of the traditional sources of energy. The amorphous silicon (a-Si) film has been considered as one of the most important materials used for solar cells and attracted most attention, because of its high absorption coefficient and low cost. Optical band gap (Eg) is a very important parameter of silicon films using for solar cells. In most cases, photons with energies equal to the Eg will be absorbed by photovoltaic materials and produce one electron-hole pair.