Dependence of Regioregular Poly(3-hexylthiophene) Film Morphology and Field-Effect Mobility on Molecular Weight
Stanford University · University of California, Berkeley · +2 more institutions
Abstract
Morphological characterization has been used to explain the previously observed strong correlation between charge carrier mobility measured with thin-film transistors and the number-average molecular weight (MW) of the conjugated polymer regioregular poly(3-hexylthiophene). Atomic force microscopy and X-ray diffraction show that the low-mobility, low-MW films have a highly ordered structure composed of nanorods and the high-mobility, high-MW films have a less ordered, isotropic nodule structure. Modifying the morphology for a constant MW by changing the casting conditions or annealing the samples strongly affects the charge transport and morphology in the low-mobility, low-MW films, but has little effect on…
Citation impact
- FWCI
- 52.68
- Percentile
- 100%
- References
- 29
Authors
6- RJR. Joseph KlineCorresponding
Stanford University, University of California, Berkeley, Lawrence Berkeley National Laboratory, Stanford Synchrotron Radiation Lightsource
- MDMichael D. McGehee
Stanford Synchrotron Radiation Lightsource, Lawrence Berkeley National Laboratory, University of California, Berkeley, Stanford University
- ENEkaterina N. Kadnikova
Stanford Synchrotron Radiation Lightsource, Lawrence Berkeley National Laboratory, University of California, Berkeley, Stanford University
- JLJinsong Liu
University of California, Berkeley, Lawrence Berkeley National Laboratory, Stanford Synchrotron Radiation Lightsource, Stanford University
- JMJean M. J. Fréchet
Stanford Synchrotron Radiation Lightsource, University of California, Berkeley, Stanford University, Lawrence Berkeley National Laboratory
Topics & keywords
- Electron mobility
- Materials science
- Annealing (glass)
- Scattering
- Stacking
- Nanorod
- Thin film
- Crystallography
- Affordable and clean energy