Abstract
We have measured the photocurrent action spectra of the Al/poly(3-dodecylthiophene)(P3DDT)/ITO and Au/P3DDT/ITO sandwich cells. The photoinjection from both ITO and Au electrodes was observed at room temperature. No polarity effect was found in the ITO/P3DDT/Au device at low temperatures. The photoinjection from ITO electrode is found not effective at low temperatures. The photocurrent at low temperatures was attributed to photoinjection from Au electrode at both polarity of bias voltage. A phenomenological model of photoconductivity in poly(3-dodecylthiophene) sandwich cells at low-electric fields and low temperatures is proposed. An approach for photoconductivity enhancement in conducting polymers is discussed.
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