Abstract
Effects of exciton blocking layer (EBL) on the performance of organic photovoltaic cells (OPVC) with a basic heterostructure of ITO/CuPc/C60/EBL/Al were studied; and Alq3, CuPc, and/or LiF thin layers of various thicknesses were adopted as EBL. The characteristics of current density (J) versus bias voltage (V) of these as-fabricated OPVCs were measured in a dark room and under illumination, respectively. Then, these J-V curves were numerically analyzed by an equivalent circuit model. From the experimental J-V data, an EBL with Alq3 layer of 10 nm thick can enhance the overall efficiency by 20%, as compared with the similar OPVC without EBL. From the numerical fitting results, this improvement can be explained by an increase of photo-current density (Jph) and a decrease of series resistance (Rs). In addition, from a durability test, the OPVC with Alq3 EBL can also have the best performance than that one without EBL. Finally, the physical significance of EBL on the improvements of OPVC was discussed.
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