摘要
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.
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 en- hanced 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.
基金
supported by the National Basic Research Program of China (2009CB623604 and 2009CB930604)
National Natural Science Foundation of China (U0634003 and 60937001)
