NOVELTY - Solar cell manufacture includes forming light absorbing layer by injecting hydrogen selenide on entire surface of mixed metal layer (121), using gas injection device (300), which comprises gas pipeline (310), inner gas pipe within gas pipeline, and including opening extended through wall of inner gas pipe and disposed between opposing longitudinal ends of inner gas pipe, and injection nozzles (320) between gas pipeline and mixed metal layer.    USE - Solar cell manufacture.    ADVANTAGE - Since the inner gas pipe is disposed in the gas pipeline and includes the opening disposed in the inner gas pipe, a part of a total pressure within the gas pipeline is compensated, thus, reducing the pressure difference between both of opposing ends of the gas pipeline. The hydrogen selenide is injected through the injection nozzles in same amount from each of the nozzles, so that the light absorbing layer has uniform material application and uniform structure (e.g. dimensional thickness).    DETAILED DESCRIPTION - Solar cell manufacture comprises forming a first electrode (110) on a substrate (100); forming a mixed metal layer (121) on the first electrode; forming a light absorbing layer by injecting hydrogen selenide on an entire surface of the mixed metal layer, using a gas injection device (300); and forming a second electrode on the light absorbing layer, where gas injection device comprises gas pipeline (310), inner gas pipe within the gas pipeline, and including an opening extended through a wall of the inner gas pipe and disposed between opposing longitudinal ends of the inner gas pipe, and injection nozzles (320) between the gas pipeline and the mixed metal layer. An INDEPENDENT CLAIM is included for gas injection device.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram showing the manufacture of solar cell.    Substrate (100)    First electrode (110)    Mixed metal layer (121)    Gas injection device (300)    Gas pipeline (310)    Injection nozzles (320)