title: Microstructure-Dependent Charge Carrier Transport of Poly(3-hexylthiophene) Ultrathin Films with Different Thicknesses.
abstract: Since the interfacial order of conjugated polymers plays an essential role for the performance of field-effect transistors, comprehensive understanding on the charge carrier transport in ultrathin semiconducting films below thicknesses of 10 nm is required for the development of transparent and flexible organic electronics. In this study, ultrathin films based on poly(3-hexylthiophene) as conjugated polymer model system with a thickness range from single monolayer up to several multilayers are investigated in terms of microstructure evolution and electrical properties of different molecular weights. Interestingly, a characteristic leap in field-effect mobility is observed for films with thickness greater than four layers. This threshold mobility regarding film thickness is attributed to the transition from 2D to 3D charge carrier transport along with an increased size of the P3HT aggregates in the upper layers of the film. These results disclose key aspects on the role of the film interlayer on the charge carrier transport through conjugated polymers in transistors.
authors.affiliation: Lodz University of Technology , Faculty of Chemistry, Department of Molecular Physics, Zeromskiego 116, 90-924 Lodz, Poland.
authors.forename: Lukasz
authors.initials: L
authors.lastname: Janasz
authors.affiliation: Faculty of Chemistry, Wroclaw University of Science and Technology , Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
authors.forename: Marzena
authors.initials: M
authors.lastname: Gradzka
authors.affiliation: Faculty of Chemistry, Wroclaw University of Science and Technology , Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
authors.forename: Dorota
authors.initials: D
authors.lastname: Chlebosz
authors.affiliation: Max Planck Institute for Polymer Research , Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Zajaczkowski
authors.affiliation: Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , 69120 Heidelberg, Germany.|InnovationLab, Speyererstrasse 4, 69115 Heidelberg, Germany.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Marszalek
authors.affiliation: Faculty of Chemistry, Wroclaw University of Science and Technology , Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
authors.forename: Adam
authors.initials: A
authors.lastname: Kiersnowski
authors.affiliation: Lodz University of Technology , Faculty of Chemistry, Department of Molecular Physics, Zeromskiego 116, 90-924 Lodz, Poland.
authors.forename: Jacek
authors.initials: J
authors.lastname: Ulanski
authors.affiliation: Lodz University of Technology , Faculty of Chemistry, Department of Molecular Physics, Zeromskiego 116, 90-924 Lodz, Poland.|Max Planck Institute for Polymer Research , Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Wojciech
authors.identifier: 0000-0002-5853-1889
authors.initials: W
authors.lastname: Pisula