Ambipolar operation of organic Mott-FET

k-(BEDT-TTF)Cu[N(CN)2]Cl (k-Cl) is a Mott-insulator with larger Mott gap than k-Br and is therefore suitable for examining the influence of an increase in Mott-gap energy on the device performance. For example, it has higher resistance than k-Br and exhibit better ON/OFF ratio. In addition, it always shows ambipolar behavior, probably because of its clean surface (Figure 3). This situation allows us to analyze the critical exponents of filling-controlled Mott transition, which will give us important information about ON/OFF efficiency of the device. Because it is also possible to control the Mott gap energy by applying a mechanical strain, k-Cl device provides an ideal platform to expand Mott-FET strategy to higher temperature.

k-Cl ambi

 

AmbipolarFET-EJIC

  1. H. M. Yamamoto, Y. Kawasugi, H. Cui, M. Nakano, Y. Iwasa, and R. Kato,  
    Asymmetric Phase Transitions Observed at the Interface of a Field-Effect Transistor Based on an Organic Mott Insulator
    Euro. J. Inorg. Chem., 2014, 3841–3844 (2014)   
  2. H. M. Yamamoto, J. Ueno and Reizo Kato 
    Critical behavior of a filling-controlled Mott-transition observed at an organic field-effect-transistor interface
    Eur. Phys. J. Special Topics 222, 1057–1063 (2013) 
  3. Yoshitaka Kawasugi, Kazuhiro Seki, Yusuke Edagawa, Yoshiaki Sato, Jiang Pu, Taishi Takenobu, Seiji Yunoki, Hiroshi M. Yamamoto, and Reizo Kato,  
    Electron–hole doping asymmetry of Fermi surface reconstructed in a simple Mott insulator 
    Nature Commun., 7, 12356 (2016)