(JP10321883-A)      Solar cell has a flexible substrate (11) with a photoelectric conversion layer (14) deposited on it, which is formed by a laminate layer of non-single crystalline silicon thin films. The substrate has a linear thermal expansion coefficient of 2.0 ppm/C to 10.0 ppm/C, and is made of an alloy of iron and nickel, the nickel content being 30-51 wt.%. Production of the solar cell is also claimed, in which the nickel content of the alloy corresponding to the voltage state is controlled to act on the photoelectric conversion layer.    USE -   As an electrical energy source.    ADVANTAGE -   The planarity of the cell is improved to reduce deformation and warpage during production.    (CN1204159-A)      Solar cell has a flexible substrate (11) with a photoelectric conversion layer (14) deposited on it, which is formed by a laminate layer of non-single crystalline silicon thin films. The substrate has a linear thermal expansion coefficient of 2.0 ppm/C to 10.0 ppm/C, and is made of an alloy of iron and nickel, the nickel content being 30-51 wt.%. Production of the solar cell is also claimed, in which the nickel content of the alloy corresponding to the voltage state is controlled to act on the photoelectric conversion layer.    USE -   As an electrical energy source.    ADVANTAGE -   The planarity of the cell is improved to reduce deformation and warpage during production.    (US6040520-A)      Solar cell has a flexible substrate (11) with a photoelectric conversion layer (14) deposited on it, which is formed by a laminate layer of non-single crystalline silicon thin films. The substrate has a linear thermal expansion coefficient of 2.0 ppm/C to 10.0 ppm/C, and is made of an alloy of iron and nickel, the nickel content being 30-51 wt.%. Production of the solar cell is also claimed, in which the nickel content of the alloy corresponding to the voltage state is controlled to act on the photoelectric conversion layer.    USE -   As an electrical energy source.    ADVANTAGE -   The planarity of the cell is improved to reduce deformation and warpage during production.    (TW420879-A)      Solar cell has a flexible substrate (11) with a photoelectric conversion layer (14) deposited on it, which is formed by a laminate layer of non-single crystalline silicon thin films. The substrate has a linear thermal expansion coefficient of 2.0 ppm/C to 10.0 ppm/C, and is made of an alloy of iron and nickel, the nickel content being 30-51 wt.%. Production of the solar cell is also claimed, in which the nickel content of the alloy corresponding to the voltage state is controlled to act on the photoelectric conversion layer.    USE -   As an electrical energy source.    ADVANTAGE -   The planarity of the cell is improved to reduce deformation and warpage during production.