NOVELTY - A solar cell (100) comprises an organic heterojunction (104) including donor material(s) (106) and acceptor material(s) (108); and an inorganic heterojunction (110) including multiple inorganic semiconductor materials. The organic heterojunction and the inorganic heterojunction absorb light in different portions of a solar spectrum. The solar cell further comprises multiple electrodes providing electrical connection to the solar cell; an inorganic semiconductor layer between the organic and inorganic heterojunction; and a buffer layer between organic and inorganic semiconductor layer.    USE - A solar cell.    ADVANTAGE - The incorporation of the inorganic heterojunction makes the solar cell more efficient. The inorganic semiconductor layer has a large bandgap which absorbs and uses photon with lower energies, providing a better match for the solar spectrum, and increasing efficiency of the cell.    DETAILED DESCRIPTION - A solar cell (100) comprises an organic heterojunction (104) including donor material(s) (106) and acceptor material(s) (108); and an inorganic heterojunction (110) including multiple inorganic semiconductor materials. The organic heterojunction and the inorganic heterojunction absorb light in different portions of a solar spectrum. The solar cell further comprises multiple electrodes providing electrical connection to the solar cell; an inorganic semiconductor layer between the organic and inorganic heterojunction; and a buffer layer between organic and inorganic semiconductor layer. One of the electrodes comprises zinc oxide doped with aluminum, and another electrode comprises platinum. INDEPENDENT CLAIMS are included for:    (1) a system comprising a solar cell and circuitry configured to receive power from the solar cell; and    (2) a method of using the solar cell.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of a solar cell.    Solar cell (100)    Organic heterojunction (104)    Donor material (106)    Acceptor material (108)    Inorganic heterojunction (110)