@article{71b970c9452446d0a5eb297f258c7150,
title = "Orientation-Dependent Host–Dopant Interactions for Manipulating Charge Transport in Conjugated Polymers",
abstract = "Molecular orientation plays a critical role in controlling carrier transport in organic semiconductors (OSCs). However, this aspect has not been explored for surface doping of OSC thin films. The challenge lies in lack of methods to precisely modulate relative molecular orientation between the dopant and the OSC host. Here, the impact of molecular orientation on dopant–host electronic interactions by large modulation of conjugated polymer orientation via solution coating is reported. Combining synchrotron-radiation X-ray measurements with spectroscopic and electrical characterizations, a quantitative correlation between doping-enhanced charge carrier mobility and the Herman's orientation parameter is presented. This direct correlation can be attributed to enhanced charge-transfer interactions at host/dopant interface with increasing face-on orientation of the polymer. These results demonstrate that the surface doping effect can be fundamentally manipulated by controlling the molecular orientation of the OSC layer, enabling optimization of carrier transport.",
keywords = "carrier mobility optimization, chemical doping, meniscus-guided coating, molecular orientation, surface interactions",
author = "Fengjiao Zhang and Erfan Mohammadi and Ge Qu and Xiaojuan Dai and Ying Diao",
note = "Funding Information: This research was financially supported by the Office of Naval Research under award #N00014-19-1-2146. F.Z. acknowledges partial support from the Beijing National Laboratory for Molecular Sciences (BNLMS201912), UCAS (Y954011XX2), and Shen Postdoctoral Fellowship. Y.D., F.Z., and E.M. acknowledge partial support by the NSF MRSEC: Illinois Materials Research Center under grant number DMR 17-20633. Y.D. and G.Q. acknowledge partial support by the National Science Foundation under grant number NSF DMR 18-47828. The authors gratefully acknowledge Seok-Heon Jung and Jin-Kyun Lee from Inha University for synthesizing the conjugated polymer DPP-BTz used in this research. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under contract no. DE-AC02-06CH11357. Thanks to the beamline scientist Joseph Strazalka of the Advanced Photon Source for facilitating the GIXD measurements. Part of this research was undertaken in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois. Funding Information: This research was financially supported by the Office of Naval Research under award #N00014‐19‐1‐2146. F.Z. acknowledges partial support from the Beijing National Laboratory for Molecular Sciences (BNLMS201912), UCAS (Y954011XX2), and Shen Postdoctoral Fellowship. Y.D., F.Z., and E.M. acknowledge partial support by the NSF MRSEC: Illinois Materials Research Center under grant number DMR 17‐20633. Y.D. and G.Q. acknowledge partial support by the National Science Foundation under grant number NSF DMR 18‐47828. The authors gratefully acknowledge Seok‐Heon Jung and Jin‐Kyun Lee from Inha University for synthesizing the conjugated polymer DPP‐BTz used in this research. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under contract no. DE‐AC02‐06CH11357. Thanks to the beamline scientist Joseph Strazalka of the Advanced Photon Source for facilitating the GIXD measurements. Part of this research was undertaken in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois. Publisher Copyright: {\textcopyright} 2020 Wiley-VCH GmbH",
year = "2020",
month = oct,
day = "1",
doi = "10.1002/adma.202002823",
language = "English (US)",
volume = "32",
journal = "Advanced Materials",
issn = "0935-9648",
publisher = "Wiley-VCH",
number = "39",
}