© 2014 American Chemical Society. Model semiconducting polymer blends of well-controlled molecular weight distributions are fabricated and demonstrated to be a simple method to control intermolecular disorder without affecting intramolecular order or degree of aggregation. Mobility measurements exhibit that even small amounts of low molecular weight material are detrimental to charge transport. Trends in charge carrier mobility can be reproduced by a simple analytical model which indicates that carriers have no preference for high or low molecular weight chains and that charge transport is limited by interchain hopping. These results quantify the role of long polymer tie-chains and demonstrate the need for controlled polydispersity for achieving high carrier mobilities.
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-C1-015-21
Acknowledgements: S.H. would like to thank the National Science Foundation for support in the form of a Graduate Research Fellowship. This work was supported by the Center for Advanced Molecular Photovoltaics (CAMP) (Award No KUS-C1-015-21) made by the King Abdullah University of Science and Technology (KAUST). M.H. and Z.F. thank the Engineering and Physical Sciences Research Council (Grant Number EP/G060738/1) for funding. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.