2005 Fiscal Year Final Research Report Summary
Control of single-electron-tunneling characteristics in Si multidot structure for applying to nanodot automaton
| Project/Area Number |
15360163
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Shizuoka University |
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Principal Investigator |
IKEDA Hiroya Shizuoka University, Research institute of Electronics, Associate Professor, 電子工学研究所, 助教授 (00262882)
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| Co-Investigator(Kenkyū-buntansha) |
TABE Michiharu Shizuoka University, Research Institute of Electronics, Professor, 電子工学研究所, 教授 (80262799)
ISHIKAWA Yasuhiko Shizuoka University, Research Institute of Electronics, Assistant Professor, 大学院・工学系研究科, 助手 (60303541)
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| Project Period (FY) |
2003 – 2005
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| Keywords | nanodot automation / Si quantum dot / single-electron-tunneling characteristics / muolidot-channel transistor / Kelvin-prove force microscopy / turnstile operation / single-electron pump operation |
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| Research Abstract |
For the application to nanodot automaton and ultimately-low-consumption single-electron memory, we fabricated two-dimensional (2D) Si-multidot-channel field-effect transistors (FETs) and investigated their single-electron/hole-tunneling (SET/SHT) characteristics. In addition, we also simulated the alternative current characteristics of 2D random-multidot FETs for the realization of one-by-one transfer of electrons. The main results from this project are listed below.
(1)The fabricated 2D Si-multidot-channel FETs show current oscillation due to the Coulomb blockade (CB) phenomenon below 70K, indicating the realization of SET/SHT. From the SET/SHT characteristics, we concluded that a carrier percolation path between source and drain electrodes, considering a string of dots, namely, a series of tunnel junctions, is formed in the 2D multidot channel, and that the highest-resistance tunnel junctions dominate the carrier transport. Moreover, by illuminating light and by applying side-gate bia
… More
s, the generation and/or shift of the current peaks were observed. These phenomena can be explained by the model in which the light illumination and side-gate bias supply an additional charge to a dot adjacent to the current percolation path.
(2)The current fluctuation in SHT characteristics of the 2D Si-multidot-channel FET was observed in the particular ranges of drain voltage and gate voltage. This phenomenon is attributed to the time-dependent charging-discharging and polarity-switching of the dots adjacent to the current percolation path.
(3)By Kelvin-probe force microscopy, we observed directly the carrier flowing in the Si multidot channel during the transistor operation. At room temperature, we successfully imaged the carrier flowing in a part of the channel, for the first time.
(4)We investigated numerically the alternating-current characteristics in 2D random-multidot-channel FETs using the CB orthodox theory. It was found that the turnstile operation and single-electron pump operation meaning that electrons are transferred one by one can be performed. These operations can be interpreted using the stability diagram of the multidot FET. Less
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