NOVELTY - Manufacture of solar cell involves forming alkyl silane film and fluoro alkyl silane film on condensing lens (100), immersing condensing lens in solution with aminoalkyl silane, forming photoresist, irradiating light, photosensitizing photoresist portion, forming opening portion, removing photosensitized photoresist portion, oxygen plasma processing, making focus on back side of condensing lens into hydrophilic region, enclosing back surface of hydrophilic region by water-repellent region with fluoroalkylsilane film and arranging photoelectric conversion element in the region.    USE - Manufacture of solar cell used for solar cell module.    ADVANTAGE - The solar cell has favorable photoelectric conversion efficiency.    DETAILED DESCRIPTION - Manufacture of solar cell comprising a condensing lens and a photoelectric conversion element, involves preparing condensing lens containing a convex portion on front side, and flat surface on back side, forming an alkyl silane film on front side of the condensing lens, forming a fluoro alkyl silane film on back side of the condensing lens, immersing condensing lens in solution containing aminoalkyl silane, forming an aminoalkyl silane film on the fluoro alkyl silane film such that the aminoalkyl silane film is not formed on the alkyl silane film, forming photoresist on the aminoalkyl silane film, irradiating light to front side of condensing lens, photosensitizing photoresist portion located at focus on photoresist through focus on back side of condensing lens, focus on the fluoro alkyl silane film and focus on aminoalkyl silane film, forming opening portion focused on exposed aminoalkyl silane film, removing photosensitized photoresist portion, performing oxygen plasma processing or ozone plasma processing to remove fluoro alkyl silane film portion located at focus on the fluoro alkyl silane film and aminoalkyl silane film portion located at focus on the aminoalkyl silane film through the opening portion, making focus on back side of condensing lens into a hydrophilic region, removing remaining photoresist, obtaining the condensing lens by enclosing back surface of hydrophilic region by water-repellent region containing fluoroalkylsilane film, arranging photoelectric conversion element in the hydrophilic region, and obtaining solar cell. An INDEPENDENT CLAIM is included for manufacture of condensing lens.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the condensing lens.    Condensing lens (100)