NOVELTY - Apparatus (200) comprises: housing (202) having vacuum chamber; rotating drum (204) disposed in chamber; loading roll (206) to advance section of substrate around circumference of rotating drum; heater (224) to heat section of substrate; absorption component sputtering sources to deposit components on surface of substrate; evaporation source to vaporize component for deposition on substrate; isolation baffle to prevent contamination of component sputtering sources; buffer layer sputtering source to deposit buffer layer component; and exit roll to take up substrate from rotating drum.    USE - As apparatus for depositing layer of a flexible solar cell, such as flexible copper indium gallium di-selenide (CIGS) cell (claimed).    ADVANTAGE - The apparatus is safe and more efficient, and provides complete mixing of the absorption components with a volume production that is easy to scale up. The CIGS thin film solar cells have excellent conversion efficiency (greater than 19.5%) in laboratory environments.    DETAILED DESCRIPTION - An apparatus (200) for depositing at least one layer of a flexible solar cell, comprises: a housing (202) defining a vacuum chamber; a rotating drum (204) disposed within the vacuum chamber and coupled to a top of the vacuum chamber; a loading roll (206) configured to advance a section (210) of a substrate around a circumference of the rotating drum; a heater (224) configured to heat the section of the substrate; several absorption component sputtering sources (216) configured to deposit several absorption components on a surface of the section of the substrate; an evaporation source (220) configured to vaporize an absorption component for deposition on the surface of the section of the substrate; an isolation baffle (214) configured to prevent contamination of several absorption component sputtering sources by the evaporation source; a buffer layer sputtering source configured to deposit a buffer layer component on the surface of the section of substrate; and an exit roll (208) configured to take up the section of the substrate from the rotating drum. INDEPENDENT CLAIMS are included for the following:    (1) depositing an absorption layer and a buffer layer of a solar cell, involving: placing a roll of substrate on a loading roller inside a rotating drum; advancing a section of the roll around a circumference of the rotating drum; depositing the absorption layer on a surface of the section, where the depositing occurs during rotation of the rotating drum; depositing the buffer layer on the absorption layer; and unloading the section of the roll from the rotating drum by winding the section around an exit roller; and    (2) a flexible copper indium gallium di-selenide (CIGS) cell made by the method.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic side view of flexible solar cell coating apparatus.    Apparatus (200)    Housing (202)    Rotating drum (204)    Loading roller (206)    Exit roller (208)    Section (210)    Indexing mechanism (212)    Isolation baffle (214)    Sputtering sources (216)    Sputtering targets (218)    Evaporation source (220)    Evaporation source material (222)    Heater (224)