Single-electron tunneling through molecular quantum dots in a metal-insulator-semiconductor structure

Ryoma Hayakawa, Nobuya Hiroshiba, Toyohiro Chikyow, Yutaka Wakayama*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


A sigle-electron tunneling (SET) in a metal-insulator-semiconductor (MIS) structure is demonstrated, in which C60 and copper phthalocyanine (CuPc) molecules are embedded as quantum dots in the insulator layer. The SET is found to originate from resonant tunneling via the energy levels of the embedded molecules, (e.g., the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO)). These findings show that the threshold voltages for SET are tunable according to the energy levels of the molecules. Furthermore, SET is observable even near room temperature. The results suggest, together with the fact that these properties are demonstrated in a practical device configuration, that the integration of molecular dots into the Si-MIS structure has considerable potential for achieving novel SET devices. Moreover, the attempt allows large-scale integration of individual molecular functionalities. Single-electron tunneling via molecular quantum dots is successfully demonstrated in a practical device configuration of a metal-insulator-semiconductor structure. The phenomenon is observable up to 280 K, which is almost room temperature. Based on these attractive features, our device can be regarded as a prototype device for "More than Moore", in which molecular functionalities can be integrated into Si-based devices.

Original languageEnglish
Pages (from-to)2933-2937
Number of pages5
JournalAdvanced Functional Materials
Issue number15
Publication statusPublished - 2011 Aug 9
Externally publishedYes


  • metal-insulator-semiconductor structures
  • quantum dots
  • resonant tunneling
  • single-electron tunneling

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials


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