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Title: Synergistic Use of Pyridine and Selenophene in a Diketopyrrolopyrrole‐Based Conjugated Polymer Enhances the Electron Mobility in Organic Transistors

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [1];  [5];  [2]; ORCiD logo [7]
  1. School of Chemistry and Physics Science and Engineering Faculty Queensland University of Technology Brisbane QLD 4000 Australia
  2. Department of Advanced Materials Science School of Frontier Sciences The University of Tokyo 5‐1‐5 Kashiwanoha Kashiwa Chiba 277‐8561 Japan
  3. Centre Énergie Matériaux Télécommunications Institut National de la Recherche Scientifique 1650 boulevard Lionel‐Boulet Varennes QC J3X 1S2 Canada
  4. Department of Mechanical Engineering Faculty of Engineering National University of Singapore Block EA #07‐08, 9 Engineering Drive 1 Singapore 117576 Singapore
  5. Department of Physics Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA
  6. CSIRO Energy Centre 10 Murray Dwyer Circuit Mayfield West NSW 2304 Australia, Centre for Organic Electronics University of Newcastle Callaghan NSW 2308 Australia
  7. School of Chemistry and Physics Science and Engineering Faculty Queensland University of Technology Brisbane QLD 4000 Australia, Centre for Materials Science Queensland University of Technology Brisbane QLD 4000 Australia

Abstract To achieve semiconducting materials with high electron mobility in organic field‐effect transistors (OFETs), low‐lying energy levels (the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO)) and favorable molecular packing and ordering are two crucial factors. Here, it is reported that the incorporation of pyridine and selenophene into the backbone of a diketopyrrolopyrrole (DPP)‐based copolymer produces a high‐electron‐mobility semiconductor, PDPPy‐Se. Compared with analogous polymers based on other DPP derivatives and selenophene, PDPPy‐Se features a lower LUMO that can decrease the electron transfer barrier for more effective electron injection, and simultaneously a lower HOMO that, however, can increase the hole transfer barrier to suppress the hole injection. Combined with thermal annealing at 240 °C for thin film morphology optimization to achieve large‐scale crystallite domains with tight molecular packing for effective charge transport along the conducting channel, OFET devices fabricated with PDPPy‐Se exhibit an n‐type‐dominant performance with an electron mobility (μ e ) as high as 2.22 cm 2 V −1 s −1 and a hole/electron mobility ratio (μ he ) of 0.26. Overall, this study demonstrates a simple yet effective approach to boost the electron mobility in organic transistors by synergistic use of pyridine and selenophene in the backbone of a DPP‐based copolymer.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐AC02‐05CH11231
OSTI ID:
1634851
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 30 Journal Issue: 34; ISSN 1616-301X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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