@article{TremelFischerKayunkidetal.2014,
  author    = {Tremel, Kim and Fischer, Florian S. U. and Kayunkid, Navaphun and Di Pietro, Riccardo and Tkachov, Roman and Kiriy, Anton and Neher, Dieter and Ludwigs, Sabine and Brinkmann, Martin},
  title     = {Charge transport anisotropy in highly oriented thin films of the acceptor polymer P(NDI2OD-T2)},
  series = {dvanced energy materials},
  volume    = {4},
  journal   = {dvanced energy materials},
  number    = {10},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1614-6832},
  doi       = {10.1002/aenm.201301659},
  pages     = {13},
  year      = {2014},
  abstract  = {The nanomorphology of the high mobility polymer poly{[N,N'-bis(2-octyldodecyl)-1,4,5,8-naphthalenedicarboximide-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)} P(NDI2OD-T2) in thin films is explored as a function of different annealing conditions and correlated to optical and electrical properties. While nanofibrils with face-on orientation in form I are obtained directly after spin-coating and annealing below the melt transition temperature, clear evidence of lamellar structures is found after melt-annealing followed by slow cooling to room temperature. Interestingly these structural changes are accompanied by distinct changes in the absorption patterns. Electron diffraction measurements further show clear transitions towards predominant edge-on oriented chains in form II upon melt-annealing. Large-scale alignment with dichroic ratios up to 10 and improved order is achieved by high temperature rubbing and subsequent post-rubbing annealing. These highly oriented morphologies allow anisotropic in-plane charge transport to be probed with top-gate transistors parallel and perpendicular to the polymer chain direction. Mobilities up to 0.1 cm(2) V-1 s(-1) are observed parallel to the polymer chain, which is up to 10 times higher than those perpendicular to the polymer chain.},
  language  = {en}
}
@article{DiPietroVenkateshvaranKlugetal.2014,
  author    = {Di Pietro, Riccardo and Venkateshvaran, Deepak and Klug, Andreas and List-Kratochvil, Emil J. W. and Facchetti, Antonio and Sirringhaus, Henning and Neher, Dieter},
  title     = {Simultaneous extraction of charge density dependent mobility and variable contact resistance from thin film transistors},
  series = {Applied physics letters},
  volume    = {104},
  journal   = {Applied physics letters},
  number    = {19},
  publisher = {American Institute of Physics},
  address   = {Melville},
  issn      = {0003-6951},
  doi       = {10.1063/1.4876057},
  pages     = {5},
  year      = {2014},
  abstract  = {A model for the extraction of the charge density dependent mobility and variable contact resistance in thin film transistors is proposed by performing a full derivation of the current-voltage characteristics both in the linear and saturation regime of operation. The calculated values are validated against the ones obtained from direct experimental methods. This approach allows unambiguous determination of gate voltage dependent contact and channel resistance from the analysis of a single device. It solves the inconsistencies in the commonly accepted mobility extraction methods and provides additional possibilities for the analysis of the injection and transport processes in semiconducting materials. (C) 2014 AIP Publishing LLC.},
  language  = {en}
}
@article{SteyrleuthnerDiPietroCollinsetal.2014,
  author    = {Steyrleuthner, Robert and Di Pietro, Riccardo and Collins, Brian A. and Polzer, Frank and Himmelberger, Scott and Schubert, Marcel and Chen, Zhihua and Zhang, Shiming and Salleo, Alberto and Ade, Harald W. and Facchetti, Antonio and Neher, Dieter},
  title     = {The Role of Regioregularity, Crystallinity, and Chain Orientation on Electron Transport in a High-Mobility n-Type Copolymer},
  series = {Journal of the American Chemical Society},
  volume    = {136},
  journal   = {Journal of the American Chemical Society},
  number    = {11},
  publisher = {American Chemical Society},
  address   = {Washington},
  issn      = {0002-7863},
  doi       = {10.1021/ja4118736},
  pages     = {4245 -- 4256},
  year      = {2014},
  language  = {en}
}