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Hole mobility enhancement of MEH-PPV film by heat treatment at Tg
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The hole mobility of poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV) film was measured using the time-of-flight method. The hole mobility was enhanced 4-fold after annealing at around the glass transition temperature (Tg). Optical, atomic force, and Kelvin force microscopies, and grazing-incidence X-ray diffraction measurements indicate the enhancement can be attributed to a homogeneous filmstructure, a homogeneous Fermi level energy, and a face-on oriented structure, all of which were established by annealing at Tg.
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