NOVELTY - The solar cell comprises a tensile layer, a first photovoltaic structure, first and second electrodes each of which is connected to a different surface of the first photovoltaic structure, a second photovoltaic structure, a third electrode connected to a surface of the second photovoltaic structure, a fourth electrode connected to the surface of the second photovoltaic structure such that the third and fourth electrodes are connected to different surfaces of the second photovoltaic structure, and a protection unit for protecting the solar cell.    USE - Used as a solar cell.    ADVANTAGE - The solar cell can be easily manufactured with high light conversion efficiency, improved electrical conductive properties, reduced weight and size, less material consumption and simple structure and efficiently operated even when a tensile load is applied to the solar cell.    DETAILED DESCRIPTION - The solar cell comprises a tensile layer, a first photovoltaic structure, first and second electrodes each of which is connected to a different surface of the first photovoltaic structure, a second photovoltaic structure, a third electrode connected to a surface of the second photovoltaic structure, a fourth electrode connected to the surface of the second photovoltaic structure such that the third and fourth electrodes are connected to different surfaces of the second photovoltaic structure, and a protection unit for protecting the solar cell. The first and second photovoltaic structures comprise an electron transport layer, a hole transport layer, and a bulk heterojunction between the electron transport layer and the hole transport layer. The electron transport layer comprises: carbon flakes that are less than 5 mu m in size; and a fullerene, carbon fibers, and carbon nanotubes. The hole transport layer comprises hole transport conjugated polymer. The electron transport layer or the hole transport layer has a thickness of 2 mu m. The first photovoltaic structure is configured to generate an electric potential difference from a first range of wavelengths of incident light, and the second photovoltaic structure is configured to generate an electric potential difference from a second range of wavelengths of incident light, where the second range of wavelengths is different from the first range of wavelengths. The first electrode is also connected to the surface of the second photovoltaic structure such that the first and third electrodes are connected to different surfaces of the second photovoltaic structure. The tensile layer is conductive and functions as one of the first, second, third or fourth electrode. The protection unit is a layer of protective material, and is incorporated into the tensile layer. INDEPENDENT CLAIMS are included for:    (1) a method of manufacturing a bulk heterojunction for use in a photovoltaic structure;    (2) an apparatus for cooling a solar cell; and    (3) a system comprising an apparatus for cooling a solar cell.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of layered structures of a tensile membrane.    Woven conducting material (30)    Photovoltaic structure (32)    Top transparent conductor (34)    Protection polymer-based coat (36)    Preparation coat. (38)