NOVELTY - A solar cell comprises a silicon wafer (1); and a spectrum converter (20) manufactured to be a polymer thin film. The silicon wafer accommodates the spectrum converter. The polymer thin film is filled with inorganic fluorescent powder (21) and in contact with the outer layer of the silicon wafer, which can enhance the absorption of a first specific wavelength of solar radiation and re-radiate into a second specific wavelength of radiation.    USE - For converting short-wavelength and visible wave of sun light into infrared and red light; for converting solar radiation into usable energy.    ADVANTAGE - The solar cell and the spectrum converter uses a broadband spectrum converter to enhance the absorption of the visible light up to 80%. The spectrum converter has higher converting efficiency with a higher photon radiation up to 96%. Because the fluorescent powder has a bright color, it is often used in reducing the reflection coefficient on the outer surface of a solar cell, thereby reducing the requirement for the outer structure of the solar cell. The fully colored fluorescent powder can reduce the cost of a solar cell. The solar cell with the spectrum converter can enhance the converting efficiency of a single crystalline silicon wafer in the wavelength range between 380-550nm, which has higher solar radiation energy; consequently, the overall converting efficiency of a solar cell can be enhanced, and it is thus favorably compared with conventional solar cells.    DETAILED DESCRIPTION - A solar cell comprises a silicon wafer (1); and a spectrum converter (20) manufactured to be a polymer thin film. The silicon wafer accommodates the spectrum converter. The polymer thin film is filled with inorganic fluorescent powder (21) and in contact with the outer layer of the silicon wafer, which can enhance the absorption of a first specific wavelength of solar radiation and re-radiate into a second specific wavelength of radiation. The silicon wafer is a p-type monocrystalline silicon wafer, a p-type polycrystalline silicon wafer, a n-type monocrystalline silicon wafer, or a n-type polycrystalline silicon wafer. The inorganic fluorescent powder is inorganic fluorescent super-dispersion particle. The chemical composition of the inorganic fluorescent powder is (YGd)3Al5-x(Mg,Si)xO12 (where x=0-3), and at least one of Ce+3, Cr+3, and Fe+3 are taken as exciting agents. An INDEPENDENT CLAIM is included for a spectrum converter used in a solar cell.    DESCRIPTION OF DRAWING(S) - The figure shows the structure of the solar cell.    silicon wafer (1)    spectrum converter (20)    fluorescent powder. (21)