NOVELTY - The photoactive device comprises first and second electrodes, and a photoactive region (122A) disposed between and electrically connected to the first and second electrodes. The photoactive region comprise: a first organic photoactive layer comprising a first donor material formed above the first electrode, where the first donor material comprises photoactive polymer-wrapped carbon nanotubes; a second organic photoactive layer comprising a first acceptor material formed above the first organic photoactive material layer; and additional organic photoactive materials.    USE - The photoactive device such as photo-detector and photovoltaic device is useful to detect incident electromagnetic radiation in the infrared and near-infrared spectrum or as a solar cell to generate power.    ADVANTAGE - The photoactive device has high efficiency, improved stability and excellent charge transport characteristics, is capable of efficiently producing excitons upon irradiation by infrared and near-infrared radiation, increases the density of nanotubes in the photoactive regions while maintaining a very low probability of percolating conducting paths, and can be easily and economically fabricated using the inexpensive organic equivalents.    DETAILED DESCRIPTION - The photoactive device comprises first and second electrodes, and a photoactive region (122A) disposed between and electrically connected to the first and second electrodes. The photoactive region comprise: a first organic photoactive layer comprising a first donor material formed above the first electrode, where the first donor material comprises photoactive polymer-wrapped carbon nanotubes; a second organic photoactive layer comprising a first acceptor material formed above the first organic photoactive material layer; and additional organic photoactive materials disposed between the first and second organic photoactive material layers, where the additional organic photoactive material layers serves as a donor relative to the first acceptor material or as an acceptor relative to the first donor material. The additional organic photoactive material layers comprise a unitary layer having openings, a discontinuous layer having islands, and a small molecule material. The first organic photoactive material layer is disposed in direct contact with the second organic photoactive material layer through the openings in-between the islands. The highest occupied molecular orbital of the small molecule material is less than 0.16 eV of the highest occupied molecular orbital of the first donor material. The band gap of the small molecule material is less than a band gap of the first donor material. The small molecule material has a hole mobility of less than 1x 10-9 cm2/Vs and an absorption coefficient of 5x 104 cm-1 across a wavelength band of 600-900 nm. One of the organic photoactive material layers comprises a co-deposited layer of the small molecule material and the first acceptor material. The first electrode is formed from a transparent polymer electrode material, which is annealed in air for 10-30 minutes at 300 degrees C. The acceptor material is C60 having a thickness of 100-140 nm. The polymer-wrapped carbon nanotubes are semiconducting polymer-wrapped single-wall carbon nanotubes, are wrapped with a photoactive polymer, and create excitons upon absorption of light in the range of 400-1400 nm. A first exciton blocking layer is provided between the second organic photoactive material layer and the second electrode. A second exciton blocking layer is provided between the first organic photoactive material layer and the first electrode. An electron blocking layer provided between the first organic photoactive material layer and the first electrode. The first organic photolayer active material layer is a bulk hetrojunction.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of architecture of a planar heterojunction of a photoactive device.    Conducting anode layer (110A)    Electron donor layer (120A)    Photoactive region (122A)    Electron acceptor layer (130A)    Exciton blocking layer (140A)    Conducting cathode layer. (150A)