NOVELTY - A solar cell (100) comprises transparent substrate, tin-doped indium oxide (ITO) (120) or other transparent conducting anode on the transparent substrate, semiconductor layer on the ITO anode, electron blocking layer (EBL) on semiconducting layer, active organic layer on EBL, lithium fluoride layer (160) on active organic layer, and metallic cathode on lithium fluoride layer. The semiconducting layer comprises poly(3,4-ethylene-dioxythiophene) (PEDOT), and poly(styrene sulfonate) (PSS).    USE - A solar cell for use in organic photovoltaic device (claimed).    ADVANTAGE - The solar cell uses interfacial EBL that enhances the solar cell performance such as increased power conversion efficiency, maximizes hole transport from active layer to anode, and minimizes the charge recombination losses at the anode. The solar cell can be easily fabricated. The solar cell also provides organic photovoltaic device made of flexible substrates, lightweight, and amenable to production by inexpensive techniques such as spin-coating, doctor blading, and printing.    DETAILED DESCRIPTION - A solar cell comprises transparent substrate, ITO or other transparent conducting anode on the transparent substrate, semiconductor layer on the ITO anode, EBL on semiconducting layer, active organic layer on EBL, lithium fluoride layer on active organic layer, and metallic cathode on lithium fluoride layer. The semiconducting layer comprises PEDOT, and PSS. The EBL comprises polymer poly(9,9-dioctyl fluorene-co-N-(4-(3-methyl propyl)diphenyl) amine) (TFB), and small molecule 4,4'-bis((p-trichlorosilyl propyl phenyl)phenyl amino) biphenyl (TPDSi2) (140). The active organic layer comprises poly(2-methoxy-5-(3',7'-dimethyl-octyloxy))-p-phenylene vinylene (MDMO-PPV) (150), and (6,6)-phenyl-61C butyric acid methyl ester (PCBM). The metallic cathode comprises aluminum cathode. An INDEPENDENT CLAIM is included for fabricating solar cell comprising preparing first solution containing PEDOT and PSS, preparing second solution containing TFB and TPDSi2, preparing third solution containing MDMO-PPV and PCBM, providing substrate with ITO anode coated layer, patterning ITO anode coated layer into at least two spatially separated strips to form anode, spin coating the first solution onto the patterned ITO anode-coated substrate to form PEDOT:PSS layer on it, spin coating the second solution on PEDOT:PSS layer to form TPDSi2:TFB layer on it, spin coating the second solution on the TPDSi2:TFB layer to form active organic layer, vapor depositing lithium fluoride onto the active organic layer, and forming metallic cathode on the lithium fluoride layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the organic photovoltaic cell with EBL.    Solar cell (100)    Glass (110)    ITO (120)    MDMO-PPV (150)    Lithium fluoride layer (160)    Aluminum (170)    Glass held on by epoxy (180)