Abstract
AbstractWe have investigated the contribution of oxygen ions and electrons in the oxygen plasma treatment of an 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 treatment by positive oxygen ions, short‐circuit photocurrent density increased markedly. The enhancement of photocurrent was explained in terms of a lowering of the total resistance between the CuPc layer and ITO due to an increase in the work function and highly oriented stacking in CuPc molecular configurations during the growth process. In the case of treatment by electrons, on the other hand, the fill factor showed a high value of about 0.5. However, further studies are needed for confirmation of this phenomenon. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 154(4): 1–7, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20313
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