NOVELTY - A photoactive device (300), comprises at least first and second discrete photoactive layers (302) sandwiched between a first electrode layer (304) and a second electrode layer (306); and at least a first transparent boundary layer separating the first photoactive layer from the second photoactive layer. The boundary layer is substantially discrete from each of the first and second photoactive layers.    USE - For producing electricity, in a space, military applications, in electronic devices with display or viewing windows, in transparent power generator, and in low power display applications e.g. shelf signage in stores such as super markets, that employ small LCD display, calculators, watches, clocks, and handheld computer games.    ADVANTAGE - The photoactive devices have improved conversions efficiencies relative to prior art devices. The photoactive devices more efficiently absorb the incident light for ultimate conversion to another energy form, e.g. electricity.    DETAILED DESCRIPTION - A photoactive device (300), comprises at least first and second discrete photoactive layers (302) sandwiched between a first electrode layer (304) and a second electrode layer (306); and at least a first transparent boundary layer separating the first photoactive layer from the second photoactive layer. The boundary layer is substantially discrete from each of the first and second photoactive layers. The boundary layer comprises second and third electrode layers insulated from each other. The third electrode layer electrically contacts the first photoactive layer and the fourth electrode layer electrically contacts the second photoactive layer. The transparent boundary layer comprises a transparent conductive charge recombination layer that is electrically connected to each of the first and second photoactive layers. The boundary layer comprises a transparent conductive charge recombination layer disposed adjacent the first photoactive layer and a charge blocking layer disposed adjacent to the second photoactive layer, such that holes generated within one of the first and second photoactive layers combine with electrons generated within the other of the first and second photoactive layer, within the conductive charge recombination layer. The first and second photoactive layers are separated by a recombination layer containing a conductive material that is configured to selectively and substantially conduct electrons from but not to the first photoactive layer to but not from the second photoactive sublayer. The recombination layer further comprises poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT-PSS).    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the photoactive devices.    Photoactive device (300)    Photoactive layer (302)    First electrode layer (304)    Second electrode layer (306)    Composite of particles (nanocrystal) (308)    Matrix component (310)    Direction of light. (312)