NOVELTY - An organic photovoltaic device comprises at least two organic photoactive regions located between a first and second electrode, where each of organic photoactive regions having donor, and acceptor, and where organic photovoltaic device having at least one exciton blocking layer, and at least one charge recombination layer, or charge transfer layer between the photoactive regions. At least one electrode comprises transparent conducting oxides or transparent conducting polymers.    USE - The organic photovoltaic device useful for generating and/or measuring electricity or an electric signal (claimed).    ADVANTAGE - The organic photovoltaic device efficiently utilizes triplet excitons, which eliminates the losses associated with conversion from the singlet excited state to the triplet excited state. The longer lifetime and diffusion length of triplet excitons in comparison to singlet excitons allows for use of a thicker photoactive region, as the triplet excitons is diffuse a greater distance to reach the donor-acceptor heterojunction, without sacrificing device efficiency. The organic photovoltaic device generates solar energy at low-cost, with large area commercial production. The organic photovoltaic device with at least two subcells electrically coupled in series has the unique advantage that the open circuit voltage (Voc) is increased to the sum of the Voc of the individual subcells.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for producing an organic photovoltaic device involving depositing a first electrode onto a substrate; depositing a first photoactive region onto the first electrode; depositing a first charge recombination layer, or charge transfer layer onto the first photoactive region; depositing a second photoactive region onto the first charge recombination layer, or charge transfer layer; and depositing a second electrode onto the second photoactive region; where the first organic photoactive region comprises a first donor and a first acceptor, where the second organic photoactive region comprises a second donor and a second acceptor, where an exciton blocking layer is deposited over at least one photoactive region and a charge recombination layer, charge transfer layer, or electrode is deposited between each photoactive region.