Unconventional Molecular Weight Dependence of Charge Transport in the High Mobility n‐type Semiconducting Polymer P(NDI2OD‐T2)

Nahid, Masrur M.; Matsidik, Rukiya; Welford, Adam; Gann, Eliot; Thomsen, Lars; Sommer, Michael; McNeill, Christopher R.

doi:10.1002/adfm.201604744

Title: Unconventional Molecular Weight Dependence of Charge Transport in the High Mobility n‐type Semiconducting Polymer P(NDI2OD‐T2)

Journal Article · Wed Jan 18 00:00:00 EST 2017 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201604744· OSTI ID:1401892

Nahid, Masrur M. ^[1]; Matsidik, Rukiya ^[2]; Welford, Adam ^[1]; Gann, Eliot ^[3]; Thomsen, Lars ^[4]; Sommer, Michael ^[2]; McNeill, Christopher R. ^[1]

Department of Materials Science and Engineering Monash University Victoria 3800 Australia
Institut für Makromolekulare Chemie University of Freiburg Stefan‐Meier‐Str. 31 79104 Freiburg Germany, Freiburger Materialforschungszentrum FMF University of Freiburg Stefan‐Meier‐Str. 21 79104 Freiburg Germany, Freiburger Institut für interaktive Werkstoffe und bioinspirierte Technologien FIT University of Freiburg Georges‐Köhler‐Allee 105 79110 Freiburg Germany
Department of Materials Science and Engineering Monash University Victoria 3800 Australia, Australian Synchrotron Victoria 3800 Australia
Australian Synchrotron Victoria 3800 Australia

The charge transport and microstructural properties of five different molecular weight (MW) batches of the naphthalenediimide‐thiophene copolymer P(NDI2OD‐T2) are investigated. In particular, the field‐effect transistor (FET) performance and thin‐film microstructure of samples with MW varying from M _n = 10 to 41 kDa are studied. Unlike conventional semiconducting polymers such as poly(3‐hexylthiophene) where FET mobility dramatically drops with decreasing molecular weight, the FET mobility of P(NDI2OD‐T2)‐based transistors processed from 1,2‐dichlorobenzene is found to increase with decreasing MW. Using a combination of grazing‐incidence wide‐angle X‐ray scattering, near‐edge X‐ray absorption fine‐structure spectroscopy, atomic force microscopy, and resonant soft X‐ray scattering, the increase in FET mobility with decreasing MW is attributed to the pronounced increase in the orientational correlation length (OCL) with decreasing MW. In particular, the OCL is observed to systematically increase from <100 nm for the highest MW samples to ≈1 µm for the lowest MW samples. The improvement in OCL and hence mobility for low MW samples is attributed to the lack of aggregation of low MW chains in solution promoting backbone ordering, with the pre‐aggregation of chains in 1,2‐dichlorobenzene found to suppress longer‐range liquid crystalline order.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐AC02‐05CH11231

OSTI ID:: 1401892

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 27 Journal Issue: 9; ISSN 1616-301X

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

Country of Publication:: Germany

Language:: English

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Cited by: 52 works

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