NOVELTY - An indium-tin oxide (ITO) substrate (5) is obtained. A layer of cesium carbonate is sprayed onto the etched ITO substrate and annealed. An active layer (30) of poly-3-hexylthiophene and (6,6)-phenyl-61C butyric acid methyl ester is sprayed on the layer. The obtained solar photovoltaic cell (1) is dried. A layer comprising poly(3,4)ethylenedioxythiophene:polystyrenesulfonate mixed with dimethyl sulfoxide is sprayed on the active layer. The cell is placed in high vacuum, annealed, and encapsulated with UV-cured epoxy.    USE - Manufacture of inverted organic solar photovoltaic cell (claimed) for applications on windows and windshields, indoor applications, tents, military back-packs, and combat uniforms.    ADVANTAGE - The method enables easy and economical manufacture of large-scale inverted organic solar array, which provides a highly portable renewable power supply for deployed military forces.    DETAILED DESCRIPTION - An indium-tin oxide (ITO) substrate is obtained. A layer of cesium carbonate is sprayed onto the etched ITO substrate and annealed inside a glove box. An active layer of poly-3-hexylthiophene (P3HT) and (6,6)-phenyl-61C butyric acid methyl ester (PCBM) is sprayed on the layer of cesium carbonate. The obtained solar photovoltaic cell is dried in an antechamber under vacuum for at least 12 hours. A layer comprising poly(3,4)ethylenedioxythiophene:polystyrenesulfonate mixed with 5 vol.% of dimethyl sulfoxide is sprayed on the active layer. The solar photovoltaic cell is placed in a high vacuum for 1 hours and annealed at 120 degrees C, 160 degrees C or 120 degrees C for 10 minutes, followed by high vacuum for 1 hour and annealing at 160 degrees C for 10 minutes. The solar photovoltaic cell is then encapsulated with a UV-cured epoxy. An INDEPENDENT CLAIM is included for organic solar photovoltaic cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the organic solar photovoltaic cell.    Organic solar photovoltaic cell (1)    Substrate (5)    Indium-tin oxide (10)    Active layer (30)    Interstitial layer (40)