NOVELTY - The bio-solar cell comprises photosynthetic complexes (101), carbon nanotubes (102) upon which the photosynthetic complexes are bound at a first region of the carbon nanotubes, a flexible conductive substrate (103) attached to a second region of the carbon nanotubes, and an insulating layer (104) between the first and second regions. Each photosynthetic complex comprises chlorophyll compounds and components of photosystem II. The bio-solar cell comprises an aqueous liquid surrounding the first region. The insulating layer physically separates the conductive substrate from the aqueous liquid.    USE - The bio-solar cell of an assembly is useful in a system for converting light to energy (all claimed).    ADVANTAGE - The bio-solar cell has lightweight and high flexibility, and ensures efficient conversion of light to energy without emission of air and solid waste.    DETAILED DESCRIPTION - The bio-solar cell comprises photosynthetic complexes (101), carbon nanotubes (102) upon which the photosynthetic complexes are bound at a first region of the carbon nanotubes, a flexible conductive substrate (103) attached to a second region of the carbon nanotubes, and an insulating layer (104) between the first and second regions. Each photosynthetic complex comprises chlorophyll compounds and components of photosystem II. The bio-solar cell comprises an aqueous liquid surrounding the first region. The insulating layer physically separates the conductive substrate from the aqueous liquid. The aqueous liquid is water and is contained within a clear container. The photosynthetic complexes are covalently bound to a single carbon nanotube, and further comprise cofactors and antioxidants. The carbon nanotubes are bound to the conductive substrate using an air-assisted chemical vapor deposition technique, and are aligned normal to the conductive substrate. The first regions of the carbon nanotubes protrude through the insulating layer. One of the carbon nanotubes comprises multi-walled nanotubes and single-walled nanotubes. One of the chlorophyll compounds is synthetically prepared. The carbon nanotubes bound to the conductive substrate is not bound to a photosynthetic complex. The carbon nanotubes that are not bound to a photosynthetic complex are grouped together. The groups of unbound carbon nanotubes are separated on the conductive substrate from groups of the carbon nanotubes that are bound to a photosynthetic complex. The separated groups of carbon nanotubes form an interdigitated pattern on the conductive substrate. The carbon nanotubes and the conductive substrate are covered by the insulating layer. The insulating layer comprises photo synthetic complexes comprising chlorophyll compounds and one or more components of Photosystem II. INDEPENDENT CLAIMS are included for:    (1) a bio-solar cell assembly;    (2) a method for converting light to energy; and    (3) a system for converting light to energy.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a bio-solar cell.    Photosynthetic complex (101)    Carbon nanotube (102)    Conductive substrate (103)    Insulating layer (104)    Aqueous liquid area. (105)