Journal of the American Chemical Society · 2015 · 262 citations · 30 references
Natural SciencesMaterials EngineeringMaterials ScienceElectronic MaterialsEnergy MaterialsThin FilmsConducting PolymersConductive PolymersPhotovoltaic DevicesPhotovoltaic MaterialsSolar Cell MaterialsSolar CellsConductivityEnergy Conversion EfficiencyInterlayer MaterialsLight-absorbing LayersOrganic Solar CellsPower ConversionPower Conversion EfficiencyThin-film Solar Cells
A highly photoconductive cathode interlayer was achieved by doping a 1 wt % light absorber, such as perylene bisimide, into a ZnO thin film, which absorbs a very small amount of light but shows highly increased conductivity of 4.50 × 10(-3) S/m under sunlight. Photovoltaic devices based on this kind of photoactive cathode interlayer exhibit significantly improved device performance, which is rather insensitive to the thickness of the cathode interlayer over a broad range. Moreover, a power conversion efficiency as high as 10.5% was obtained by incorporation of our photoconductive cathode interlayer with the PTB7-Th:PC71BM active layer, which is one of the best results for single-junction polymer solar cells.
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