Abstract
We have investigated the contribution of the oxygen ions and electrons on oxygen plasma treatment of Indium Tin Oxide (ITO) electrode for organic solar cell (ITO/CuPc/C60/CuPc/Al). The cell characteristics were markedly improved by the treatments using positive oxygen ions and electrons. In the case of the treatment by positive oxygen ions, short-circuit photocurrent density increased markedly. The enhancement of photocurrent was explained in terms of a lowering of total resistance between CuPc layer and ITO due to an increase in work function and a stacking with high orientation in CuPc molecular configurations during the grow process. In the case of the treatment by electrons, on the other hand, fill factor showed a high value (about 0.5). However, further studies are needed for confirmation of this phenomenon.
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