Photocarrier Mobility in Regioregular Poly(3-hexylthiophene) Studied by the Time of Flight Method
- 1 October 1999
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 38 (10B) , L1188-1190
- https://doi.org/10.1143/jjap.38.l1188
Abstract
The carrier mobility in the regioregular poly(3-hexylthiophene)(PHT) film has been studied by means of the time of flight (TOF) method using a sandwich-type cell of indium tin oxide(ITO)/PHT (cast film)/Al. The response of the photocurrent exhibits a dispersive character; however, the clear kink associated with the transit time of the carrier is observed. The drift mobility of holes is determined to be 4 ×10-4 cm2/V·s and almost independent of the field > 105 V/cm at room temperature. This is the largest TOF mobility in poly(3-alkylthiophene) reported to date. It is also found that the activation energy of the mobility is 88 meV and almost independent of the field. The results are discussed taking various transport models into consideration.Keywords
This publication has 15 references indexed in Scilit:
- Inhomogeneity of Spin-Coated and Cast Non-Regioregular Poly(3-hexylthiophene) Films. Structures and Electrical and Photophysical PropertiesMacromolecules, 1998
- Langmuir–Blodgett films manipulation of regioregular poly(3-alkylthiophene)sThin Solid Films, 1998
- Hall mobility in poly(4,4′-dipentoxy-2,2′bithiophene) as a function of the doping levelApplied Physics Letters, 1998
- Regiocontrolled Synthesis of Poly(3-alkylthiophenes) Mediated by Rieke Zinc: Their Characterization and Solid-State PropertiesJournal of the American Chemical Society, 1995
- Polyaniline as a transparent electrode for polymer light-emitting diodes: Lower operating voltage and higher efficiencyApplied Physics Letters, 1994
- Photoconduction in poly(3-alkylthiophene) II. Charge transportSynthetic Metals, 1993
- The first regioregular head-to-tail poly(3-hexylthiophene-2,5-diyl) and a regiorandom isopolymer: nickel versus palladium catalysis of 2(5)-bromo-5(2)-(bromozincio)-3-hexylthiophene polymerizationJournal of the American Chemical Society, 1992
- Characteristics of Heterojunction Consisting of Conducting Polymers of Polythiophene and PolypyrroleJapanese Journal of Applied Physics, 1985
- Anomalous transit-time dispersion in amorphous solidsPhysical Review B, 1975
- On Pre-Breakdown Phenomena in Insulators and Electronic Semi-ConductorsPhysical Review B, 1938