[7a-PB1-1~8] 9.3 ナノエレクトロニクス

▲ [7a-PB1-4] Gate Oscillation of Chemically Assembled Single-Electron Transistor
Using 2 nm Au Nanoparticle

〇(M2)Pipit Uky Vivitasari¹、Yoon Young Choi¹、Ain Kwon¹、Yasuo Azuma¹、Masanori Sakamoto²、Toshiharu Teranishi²、Yutaka Majima¹ (1.Tokyo Tech.、2.Kyoto Univ.)

キーワード：single-electron transistor, nanogap electrode, coulomb blockade

The merit of utilization of small nanoparticle with 2-nn diameter as Coulomb island is higher charging energy than k_BT at room temperature. However, a gate modulation tends to become difficult since the gate capacitance to the Coulomb island become small owing to small diameter. Recently we have improved the shape of nanogap electrodes by using Pt base electrodes on SiO₂/Si substrate in order to reduce the width of source and drain electrodes. Here, we demonstrate the clear Coulomb blockade characteristics of single-electron transistor (SET) using 3-legs phenol protected 2 nm Au nanoparticle as Coulomb island measured at 9 K (fig. 1). Due to small diameter size of nanoparticle down to 2 nm, a relatively wide Coulomb blockade region was observed from -0.5 to +0.5 V. The experimental I_D-V_D curve was good agreement with theoretical curve based on orthodox model as shown in Fig.1(a). Fig 1(b) shows the gate oscillation measured under several drain voltages from 0.1 to 0.4 V. The SET shows clear Coulomb oscillation even though the size of the Coulomb island is 2 nm. Moreover, the SET has comparable high charging energy of 166 meV. This high charging energy is 6 times higher that thermal energy k_BT at room temperature (RT) indicating the potential of RT operation.
This study was partially supported by MEXT Elements Strategy Initiative to Form Core Research Center from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan; the Collaborative Research Project of Laboratory for Materials and Structures, Tokyo Institute of Technology; the Collaborative Research Project of the Institute of Chemical Research, Kyoto University (Grant No. 2017-76); and the BK Plus program, Basic Science Research (NRF-2014R1A6A1030419).