Yamamura Akifumi, Watanabe Shun, Uno Mayumi, Mitani Masato, Mitsui Chikahiko, Tsurumi Junto, Isahaya Nobuaki, Kanaoka Yusuke, Okamoto Toshihiro, Takeya Jun
Material Innovation Research Center and Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
Japan Science and Technology Agency, Precursory Research for Embryonic Science and Technology, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
Sci Adv. 2018 Feb 2;4(2):eaao5758. doi: 10.1126/sciadv.aao5758. eCollection 2018 Feb.
Two-dimensional (2D) layered semiconductors are a novel class of functional materials that are an ideal platform for electronic applications, where the whole electronic states are directly modified by external stimuli adjacent to their electronic channels. Scale-up of the areal coverage while maintaining homogeneous single crystals has been the relevant challenge. We demonstrate that wafer-size single crystals composed of an organic semiconductor bimolecular layer with an excellent mobility of 10 cm V s can be successfully formed via a simple one-shot solution process. The well-controlled process to achieve organic single crystals composed of minimum molecular units realizes unprecedented low contact resistance and results in high-speed transistor operation of 20 MHz, which is twice as high as the common frequency used in near-field wireless communication. The capability of the solution process for scale-up coverage of high-mobility organic semiconductors opens up the way for novel 2D nanomaterials to realize products with large-scale integrated circuits on film-based devices.
二维（2D）层状半导体是一类新型功能材料，是电子应用的理想平台，在该平台中，整个电子态可通过与其电子通道相邻的外部刺激直接改变。在保持均匀单晶的同时扩大面积覆盖一直是相关挑战。我们证明，通过简单的单次溶液法可以成功形成由具有10 cm² V⁻¹ s⁻¹优异迁移率的有机半导体双分子层组成的晶圆尺寸单晶。实现由最小分子单元组成的有机单晶的良好控制过程实现了前所未有的低接触电阻，并实现了20 MHz的高速晶体管操作，这是近场无线通信中常用频率的两倍。溶液法扩大高迁移率有机半导体覆盖范围的能力为新型二维纳米材料在基于薄膜的器件上实现大规模集成电路产品开辟了道路。
