Efficient inverted polymer solar cells
نویسندگان
چکیده
We investigate the effect of interfacial buffer layers—vanadium oxide V2O5 and cesium carbonate Cs2CO3 —on the performance of polymer solar cells based on regioregular poly3-hexylthiophene and 6,6 -phenyl C60 butyric acid methyl ester blend. The polarity of solar cells can be controlled by the relative positions of these two interfacial layers. Efficient inverted polymer solar cells were fabricated with the structure of indium tin oxide ITO /Cs2CO3/polymer blend/vanadium oxide V2O5 /aluminum Al . Short-circuit current of 8.42 mA/cm2, open-circuit voltage of 0.56 V, and power conversion efficiency of 2.25% under a AM1.5G 130 mW/cm2 condition were achieved. The interfacial layers were also used to fabricate polymer solar cells using ITO and a thin gold Au layer as the transparent electrodes. The thickness of V2O5 layer 10 nm makes it an effective protective layer for the active layer so that ITO can be used for both the electrodes, enabling highly efficient transparent polymer solar cells i.e., polymer solar cells with transparent electrodes . Application of this structure for multiple-stacking polymer solar cells is also discussed. © 2006 American Institute of Physics. DOI: 10.1063/1.2212270
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