Investigation of hole-mobility in a polyfluorene copolymer by admittance spectroscopy

Debebe, Siraye E.; Mammo, Wendimagegn; Yohannes, Teketel; Tinti, Francesca; Zanelli, Alberto; Camaioni, Nadia
February 2010
Applied Physics Letters;Feb2010, Vol. 96 Issue 8, p082109
Academic Journal
Transport of holes in a low band gap polyfluorene, APFO-Green6, was investigated by means of admittance spectroscopy in the modulation frequency range 1–106 Hz. At room temperature, hole mobility of APFO-Green6 is dependent on the applied electric field, as commonly observed in disordered organic materials. The excess capacitance toward low frequencies provides evidence for charge relaxation in trap levels. A dispersion parameter of 0.4 was achieved from the trend of hole transit times with the electric field.


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