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We show that selenophene-substitution can be an efficient synthetic strategy toward high charge carrier mobility of isoindigo (IID)-based copolymers when their side chains are optimized. High mobility of 5.8 cm 2/Vs is demonstrated by a strategically designed IID-based polymer, with both side-chain adjustment and selenophene-substitution.
Introduction
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Figure 1. UV-Vis absorption spectra of (a) P-24-IID-TVT, (b) P-24-IID-SVS, (c) P-29IID-TVT, and (d) P-29-IID-SVS. The chemical structures of each polymer are also presented as insets.
Figure 2. GIXD patterns of (a) P-24-IID-TVT, (b) P-24-IID-SVS, (c) P-29-IID-TVT, and (d) P-29-IID-SVS. Pole figures for the polymers are summarized in (e).
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This research was financially supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2012047047) and NRF-2014M1A3A3A02034707 and by a grant (2013073172) from the Center for Advanced Soft Electronics under the Global Frontier Research Program of the MEST
Notes and references a School of Materials Science and Engineering and ERI, Gyeongsang National University, Jinju 660-701, Korea(
[email protected]) b School of Chemical Engineering and Material Science, Chung-Ang University, Seoul 156-756, Korea(
[email protected]) c Department of Chemistry and ERI, Gyeongsang National University, Jinju 660-701, Korea(
[email protected]) † Electronic Supplementary Information (ESI) available: details of the polymer synthesis, structural/morphological characterization, and the device fabrication process. See DOI: 10.1039/c000000x/ ‡ Kwang Hun Park and Kwang Hee Cheon contributed equally to this work. 1 Figure 3. Transfer (left) and output (right) characteristics of (a) P-24-IID-TVT, (b) P-24-IID-SVS, (c) P-29-IID-TVT, and (d) P-29-IID-SVS. In the output curves, each trace has an interval of VGS = -6 V.
2
Table 1. The summary on transistor parameters
cm2 /vs
Vth
Ion Ioff
3
105
4
105
5
105 10 *The average values were calculated from fifteen independent transistors. **Standard Deviation
Conclusions
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5
7 8 9 10 11 12
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14 I. Kang, T. K. An, J. Hong, H.-J. Yun, R. Kim, D. S. Chung, C. E. Park, Y.-H. Kim, S.-K. Kwon, Adv. mater. 2013, 25, 4.
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