Taming Charge Transport in Semiconducting Polymers with Branched Alkyl Side Chains

Schroeder, Bob C.; Kurosawa, Tadanori; Fu, Tianren; Chiu, Yu‐Cheng; Mun, Jaewan; Wang, Ging‐Ji Nathan; Gu, Xiaodan; Shaw, Leo; Kneller, James W. E.; Kreouzis, Theo; Toney, Michael F.; Bao, Zhenan

doi:10.1002/adfm.201701973

Taming Charge Transport in Semiconducting Polymers with Branched Alkyl Side Chains

Journal Article · Mon Jul 24 00:00:00 EDT 2017 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201701973· OSTI ID:1389144

^[1]; Kurosawa, Tadanori ^[2]; Fu, Tianren ^[3]; Chiu, Yu‐Cheng ^[4]; Mun, Jaewan ^[3]; Wang, Ging‐Ji Nathan ^[3]; Gu, Xiaodan ^[5]; ^[3]; Kneller, James W. E. ^[6]; Kreouzis, Theo ^[6]; Toney, Michael F. ^[7]; ^[3]

Department of Chemical Engineering Stanford University 443 Via Ortega Stanford CA 94305 USA, Materials Research Institute and School of Biological and Chemical Sciences Queen Mary University of London Mile End Road London E1 4NS UK
Department of Chemical Engineering Stanford University 443 Via Ortega Stanford CA 94305 USA, Department of Advanced Materials Science Graduate School of Frontier Sciences University of Tokyo 5‐1‐5 Kashiwanoha Kashiwa 277‐8561 Chiba Japan
Department of Chemical Engineering Stanford University 443 Via Ortega Stanford CA 94305 USA
Department of Chemical Engineering Stanford University 443 Via Ortega Stanford CA 94305 USA, Department of Chemical Engineering and Materials Science Yuan Ze University 135 Yuandong Rd, Zhongli District Taoyuan City 320 Taiwan
Department of Chemical Engineering Stanford University 443 Via Ortega Stanford CA 94305 USA, Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park CA 94025 USA, School of Polymers and High Performance Materials University of Southern Mississippi 118 College Drive Hattiesburg MS 39406 USA
Materials Research Institute and School of Physics and Astronomy Queen Mary University of London Mile End Road London E1 4NS UK
Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park CA 94025 USA

The solid‐state packing and polymer orientation relative to the substrate are key properties to control in order to achieve high charge carrier mobilities in organic field effect transistors (OFET). Intuitively, shorter side chains are expected to yield higher charge carrier mobilities because of a denser solid state packing motif and a higher ratio of charge transport moieties. However our findings suggest that the polymer chain orientation plays a crucial role in high‐performing diketopyrrolopyrrole‐based polymers. By synthesizing a series of DPP‐based polymers with different branched alkyl side chain lengths, it is shown that the polymer orientation depends on the branched alkyl chain lengths and that the highest carrier mobilities are obtained only if the polymer adopts a mixed face‐on/edge‐on orientation, which allows the formation of 3D carrier channels in an otherwise edge‐on‐oriented polymer chain network. Time‐of‐flight measurements performed on the various polymer films support this hypothesis by showing higher out‐of‐plane carrier mobilities for the partially face‐on‐oriented polymers. Additionally, a favorable morphology is mimicked by blending a face‐on polymer into an exclusively edge‐on oriented polymer, resulting in higher charge carrier mobilities and opening up a new avenue for the fabrication of high performing OFET devices.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1389144

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 34 Vol. 27; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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