NOVELTY - Photoelectric conversion efficiency in a solar cell (10) is improved by, applying a mechanical stress to the solar cell; generating a tension in the solar cell by greater than or equal to 2 materials having respective lattice constants different from each other; and/or generating a tension in the solar cell using a shallow trench isolation filler, a high tensile stress silicon nitride layer, and/or a high compressive stress silicon nitride layer.    USE - Method of improving photoelectric conversion efficiency in solar cell (claimed).    ADVANTAGE - The method increases the photoelectric conversion efficiency by more than 0.05%.    DETAILED DESCRIPTION - Improvement of photoelectric conversion efficiency in a solar cell (10), comprises applying a mechanical stress to the solar cell; generating a tension in the solar cell by greater than or equal to 2 materials having respective lattice constants different from each other; and/or generating a tension in the solar cell using a shallow trench isolation filler, a high tensile stress silicon nitride layer, and/or a high compressive stress silicon nitride layer. The solar cell has a material having a light-absorbent ability, generating electron-hole pairs, and generating a current by driving a carrier in a built-in electric field. It has a planar or non-planar structure comprising a P-N junction structure, a metal-insulator-semiconductor structure, a quantum well structure, a quantum dot structure, and/or a P-I-N photodiode structure. The solar cell is a five-inch, six-inch, an eight-inch, a ten-inch, or a twelve-inch solar cell (preferably 5-12 inches). An INDEPENDENT CLAIM is included for a photoelectric conversion efficiency improved solar cell.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic illustration of uniaxial tensile strain generated from the implemented uniaxial stress on the solar cell.    Solar cell (10)    Sides of first surface (12)    Upper part of solar cell (16)    Lower part of solar cell (18)    Gasket (20)    Uniaxial stress (30)