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Ultrasonic Silicon Solar Cells Coating Spraying MachineSilicon Solar CellsAmorphous silicon (a-Si) is a popular solar cell material owing to its low cost and ease of production. Owing to disordered structure (Urbach tail), its absorption extends to the energies below the band gap resulting in a wide-range spectral response; however, it has a relatively low solar cell efficiency. The efficiency is higher in protocrystalline silicon and it has also been shown to improve stability, but not eliminate it. Protocrystalline Si also has a relatively low absorption near the band gap owing to its more o