Stable Delocalized Singlet Biradical Hydrocarbon for Organic Field‐Effect Transistors |
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| Authors: | Harunobu Koike Masayuki Chikamatsu Reiko Azumi Jun'ya Tsutsumi Kazumichi Ogawa Wataru Yamane Tomohiko Nishiuchi Takashi Kubo Tatsuo Hasegawa Kaname Kanai |
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| Affiliation: | 1. Department of Physics, Tokyo University of Science, Noda, Chiba, Japan;2. National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, Tsukuba, Ibaraki, Japan;3. Department of Chemistry, Osaka University, Toyonaka, Osaka, Japan;4. Department of Applied Physics, The University of Tokyo, Bunkyo‐ku, Tokyo, Japan |
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| Abstract: | Delocalized singlet biradical hydrocarbons hold promise as new semiconducting materials for high‐performance organic devices. However, to date biradical organic molecules have attracted little attention as a material for organic electronic devices. Here, this work shows that films of a crystallized diphenyl derivative of s‐indacenodiphenalene (Ph2‐IDPL) exhibit high ambipolar mobilities in organic field‐effect transistors (OFETs). Furthermore, OFETs fabricated using Ph2‐IDPL single crystals show high hole mobility (μh = 7.2 × 10?1 cm2 V?1 s?1) comparable to that of amorphous Si. Additionally, high on/off ratios are achieved for Ph2‐IDPL by inserting self‐assembled monolayer of alkanethiol between the semiconducting layer and the Au electrodes. These findings open a door to the application of ambipolar OFETs to organic electronics such as complementary metal oxide semiconductor logic circuits. |
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| Keywords: | ambipolar biradicals electronic structures organic field effect transistors single crystals |
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