Abstract
A charge carrier mobility of polymer films with the time-of-flight (TOF) technique using a fullerene layer was measured and the TOF photocurrent waveform can be remarkably improved. The 80-nm-thick fullerene layer is functioned as a charge-separation layer (CSL) which was placed between ITO electrode and the polymer layer of MEH-PPV (poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene]). In the CSL, the photo-generated holes and electrons can be efficiently separated, resulting in an enhanced current signal and great improvement of TOF waveform. The sample structure with fullerene layer exhibits a great advantage to measure the hole mobilities of polymers with low energy band gap.
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