14:30 〜 14:45
▼ [17p-F210-5] Au25 Nanocluster Single-Electron Transistor
キーワード：Single-electron transistor, Nanocluster, Chemically assemble
For the next generation electronic device, single-electron transistors (SETs) should play pivotal role in the sub-10 nm scaled electronic devices, since SETs have advantages for low power consumption and multi-logic circuits. Our objective is to realize room temperature operation of SETs based on Au25 nanocluster which involves icosahedral Au13 core. Au25 nanocluster has distinct bonding arrangement named “extend motif” (-S-Au-S-Au-S-) at the gold-thiolate interface, and is chemically protected by 18 ligand molecules of 16 phenylethanethiol (PET) and 2 acetylthio-bipheny-thiol. This Au25 nanocluster has unique structure, unusual stability originated from geometry effects and distinct energy levels. Consequently, this Au25 nanocluster is strongly expected to chemisorbed between electroless Au plated (ELGP) Pt nanogap electrodes and to be a Coulomb island of SET which shows room temperature (RT) operation owing to the diameter of 1 nm. Gate voltage dependence of the experimental current-voltage (Id–Vd) and differential conductance-voltage (dId/dVd–Vd) characteristics on a single Au25 cluster SET is shown in Figure 1(a) and (b). Clear gate voltage dependence of differential conductance (dId/dVd) peaks has been observed including at 9 K. Plot of output current as a function of drain voltage and voltage of side gate 2 at 160 K is shown in Figure 2. As a stable Coulomb diamond is observed in Figure 2 even at 160 K, this Au25 cluster SET has a potential to show room temperature operation.
This study was partially supported by MEXT Elements Strategy Initiative to Form Core Research Center; the Collaborative Research Project of Materials and Structures Laboratory, Tokyo Institute of Technology; the Collaborative Research Project of the Institute of the Chemical Research, Kyoto University (Grant 2017-76), and by BK Plus program, Basic Science Research (NRF-2014R1A6A1030419).
This study was partially supported by MEXT Elements Strategy Initiative to Form Core Research Center; the Collaborative Research Project of Materials and Structures Laboratory, Tokyo Institute of Technology; the Collaborative Research Project of the Institute of the Chemical Research, Kyoto University (Grant 2017-76), and by BK Plus program, Basic Science Research (NRF-2014R1A6A1030419).