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(Color online) Device setup for a solution processed tandem solar cell.
Effect of a ZnO layer sandwiched between the active layer and the electrode for P3HT:PCBM and MDMO-PPV:PCBM solar cells. The active layers were thick.
Current density–voltage characteristics of the front, back, and tandem cells under an arbitrary halogen lamp. Notice the improved performance after UV illumination.
Current density–voltage characteristics of the front, middle, and back cells and of the resulting triple junction cell after UV illumination.
Solar cell characteristics of multiple junction organic solar cells with ITO/PEDOT:PSS as transparent electrode, ZnO/modified PEDOT as intermediate layer, and as reflective electrode. All cells are polymer:PCBM cells. The front and middle cells have an ITO/PEDOT/active layer/ZnO/metal structure. is the estimated value for the voltage for a multiple junction cell obtained via superposition of the voltages of the single junction cells.
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