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We have studied steady-state photocurrents of poly(3-octylthiophene)/C 60 composite thin-film cells formed with ITO/Al and ITO/Au electrodes. For the ITO/Al electrode, the photocurrent is dominated by photocarriers generated at or near the positively biased electrode, as demonstrated by clear antibatic or symbatic behaviors depending on the polarity of the bias. For the ITO/Au electrode, since...