NOVELTY - Solar cell comprises in combination: (a) a transparent upper electrode (100) for conducting electrodes and for allowing incoming photons (200) of light to pass through them; (b) an exciton trapping region (110) disposed proximate to the transparent upper electrode; (c) a pigment layer coupled to the exciton trapping region; (d) the first dye in the exciton trapping region serving to trap excitons emitted by the pigment layer and supplying freed electrons to the transparent upper electrode in response to it; and (e) a backing electrode (140).    USE - The solar cell is useful: for generating electricity; in standard solar cell modules of the type mounted on roofs of homes, on public streetlights, and on other sun-exposed surfaces, like covered parking spaces; on roofs of cars, for incorporating into building glass, in carry-cases or covers for mobile computing/communication devices (including laptops, tablets, smartphones) for recharging, off-grid remote electrification, consumer electronic devices used indoors and outdoors, picture frame-like fixtures, tents and camping trailers and recreational vehicles; and as energy generating component of a system that also includes batteries or supercapacitors for temporary power storage while light is available, and later discharge such power when light is not available e.g. at night.    ADVANTAGE - The solar cell: is inexpensive; provides improved sunlight conversion efficiency; does not require a semiconductor substrate, and is easy to manufacture; captures a large portion of the impinging light for conversion into electricity; and has improved method of trapping excitons, thus ensuring rapid electron transfer, preventing back transfer of excitation energy, and minimizing recombination losses.    DETAILED DESCRIPTION - Solar cell comprises in combination: (a) a transparent upper electrode (100) for conducting electrodes and for allowing incoming photons (200) of light to pass through them; (b) an exciton trapping region (110) disposed proximate to the transparent upper electrode, where the exciton trapping region serves to conduct trapped electrons to the transparent electrode, and the exciton trapping region includes graphene and a first dye; (c) a pigment layer coupled to the exciton trapping region, where the pigment layer absorbs photons of light within a first wavelength spectrum and emits excitons in response to them; (d) the first dye in the exciton trapping region serving to trap excitons emitted by the pigment layer and supplying freed electrons to the transparent upper electrode in response to them; and (e) a backing electrode (140) electrically coupled to the pigment layer for transporting electrons to the pigment layer to replenish electrons conducted by the transparent upper electrode. An INDEPENDENT CLAIM is also included for improving the efficiency of dye-sensitive solar cells, the dye-sensitive solar cell including a first light absorbing dye to absorb photons of light, and an upper translucent electrode in proximity to the first light absorbing dye for conducting electrons freed by the first light absorbing dye, the improvement comprising: providing a region of graphene molecules proximate to the first light absorbing dye; adhering at least one trapping dye (110A) to the graphene molecules for trapping excitons emitted by the first light absorbing dye; transmitting freed electrons from the excitons trapped by the trapping dye to the graphene; and transmitting such freed electrons from the graphene to the upper translucent electrode.    DESCRIPTION OF DRAWING(S) - The figure shows a functional process diagram illustrating schematically the functions performed by the components of the solar cell.    Transparent upper electrode (100)    Exciton trapping region (110)    Trapping dye (110A)    Backing electrode (140)    Light photon (200)