NOVELTY - Fabricating an organic photovoltaic device involves forming substrate; forming indium thin oxide (ITO) layer on the substrate, where the ITO layer comprises an anode; forming hole transport layers (HTL) layer on the ITO layer, where the HTL layer comprises an amorphous, p-type metal oxide; forming an active layer on the HTL layer, where the active layer comprises donor region and acceptor region; and forming contact on the active layer, where the contact comprises a cathode.    USE - For fabricating an organic photovoltaic (OPV) device (claimed) e.g. solar cells.    ADVANTAGE - The metal oxide thin film is effective replacement for the typical poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) for the hole transport layers (HTL) layer in organic photovoltaic (OPV) systems, resulting in both increased device performance and lifetime. The metal oxide HTL material improves transmittance properties compared to PEDOT:PSS, which permits more light to reach the active layer and thereby improves the photon harvesting of the solar cells. The improvements in the contact properties of the amorphous, p-type metal oxide HTL materials further leads to improved performance in deep energy level donors in organic solar cells. By improving the contact properties, the photovoltaic and photocurrent is increased in these systems beyond what is achieved with PEDOT:PSS contacts.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an organic photovoltaic device comprising: a substrate; a transparent conducting oxide (TCO) layer on the substrate, where the TCO is configured to act as an anode; an HTL layer on the TCO layer; an active layer on the TCO layer.    DESCRIPTION OF DRAWING(S) - The figure shows an organic photovoltaic (OPV) device layer structure utilizing poly(N-9''-hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole) (PCDTBT)/(6,6)-phenyl-C70-butyric acid methyl ester (PC70BM) bulk heterojunction (BHJ) interfaced with a solution deposited hole transport layers (HTL).