Effect of selenophene in naphthalene-diimide-vinylene-based small molecules on n-type organic field-effect transistors |
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| Affiliation: | 5. Department of IT∙Energy Convergence (BK21 FOUR), Korea National University of Transportation, 50 Daehak-Ro, Chungju, 27469, Republic of Korea;1. Interdisciplinary Graduate School of Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda City, Nagano, 386-8567, Japan;2. Dainichiseika Color & Chemicals Mfg. Co., Ltd., 1-9-4, Horinouchi, Adachi-ku, Tokyo, 123-8588, Japan;1. Department of Medical Applied Chemistry, Chung Shan Medical University, 402, Taichung, Taiwan;2. Department of Medical Education, Chung Shan Medical University Hospital, 402, Taichung, Taiwan;3. Department of Physics, College of Science, King Khalid University, Abha, 61413, P.O. Box 9004, Saudi Arabia;4. Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha, 61413, P.O. Box 9004, Saudi Arabia;5. Department of Chemistry, College of Science, King Khalid University, Abha, 61413, P.O. Box 9004, Saudi Arabia;6. Deanship of Scientific Research, University of Bisha, Bisha, 61922, P.O. Box 551, Saudi Arabia;1. Dipartimento di Chimica, Università di Pavia, V.le Taramelli 10, 27100 Pavia, Italy;2. Department of Bioengineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;1. Interdisciplinary Graduate School of Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda City, Nagano, 386-8567, Japan;2. Dainichiseika Color & Chemicals Mfg. Co., Ltd., 1-9-4, Horinouchi, Adachi-ku, Tokyo, 123-8588, Japan |
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| Abstract: | Two naphthalene diimide (NDI)-based small molecules, one with a thiophene-vinylene-thiophene linker donor unit (N-TVT-N) and the other with a selenophene-vinylene-selenophene linker donor unit (N-SVS-N), were newly synthesized for the purpose of serving as the active materials of n-type organic field-effect transistors (OFETs). We investigated the various characteristics of the synthesized small molecules to study how the type of donor unit would affect the charge transport of the resulting thin film. The monomeric molecular structure of N-SVS-N, i.e., that with selenium (Se) substituted for sulfur, was found to be tilted about twice as much as that of N-TVT-N, and to display lower backbone planarity. Unexpectedly, the thin films of N-SVS-N each showed a smoother and more uniform surface morphology and predominantly edge-on orientation in comparison with those of N-TVT-N. As the result, the optimally annealed OFETs containing N-SVS-N and N-TVT-N exhibited electron mobilities of up to 0.016 cm2 V−1 s−1 and 6.6 × 10−3 cm2 V−1 s−1, respectively. These results could be explained by the structural features of N-SVS-N facilitating interactions between the electron-rich selenophenes. |
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| Keywords: | Organic field-effect transistors (OFETs) Naphthalene diimide (NDI) Selenophene Small molecules Planarity |
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