Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
권호 표지
DOI QR코드

DOI QR Code

Analysis of Charge Transfer Mechanism in Molecular Memory Device using Temperature-dependent Electrical Measurement

온도에 의존하는 전기적 측정을 이용한 분자 메모리 소자의 전하 이동 메커니즘 분석

  • 최경민 (경원대학교 전자공학과) ;
  • 구자룡 (경원대학교 전자공학과) ;
  • 김영관 (홍익대학교 정보디스플레이공학과) ;
  • 권상직 (경원대학교 전자공학과)
  • Published : 2008.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

A molecular memory device which has a structure of Al/$Al_2O_3$/ASA-15 LB monolayer/Ti/Al device, was fabricated. To study a charge transfer mechanism of molecular memory devices, current density-voltage (J-V) characteristics were measured at an increasing temperature range from 10 K to 300 K with an interval of 30 K. Strong temperature-dependent electrical property and tunneling through organic monolayer at low bias (below 0.5 V) were appeared. These experimental data were fitted by using a theoretical formula such as the Simmons model. In comparison between the theoretical and the experimental results, it was verified that the fitting results using the Simmons model about direct tunneling was fairly fitted below 0.5 V at both 300 K and 10 K. Hopping conduction was also dominant at all voltage range above 200 K due to charges trapped by defects located within the dielectric stack, including the $Al_2O_3$, organic monolayer and Ti interfaces.

Keywords

References

  1. C. W. Tang and S. A. VanSlyke, 'Organic electroluminescent diodes', Appl. Phys. Lett., Vol. 51, p. 913, 1987 https://doi.org/10.1063/1.98799
  2. H. Klauk, D. J. Gundlach, J. A. Nichols, and T. N. Jackson, 'Pentacene organic thin-film transistors for circuit and display applications', IEEE Trans. Electron Dev., Vol. 46, p. 1258, 1999 https://doi.org/10.1109/16.766895
  3. Y. Chen, G. Y. Jung, D. A. A. Ohlberg, X. Li, D. R. Stewart, J. O. Jeppesen, K. A. Nielsen, J. F. Stoddart, and R. S. Williams, 'Nanoscale molecular-switch crossbar circuits', Nanotechnol., Vol. 14, p. 462, 2003 https://doi.org/10.1088/0957-4484/14/4/311
  4. D. R. Stewart, D. A. A. Ohlberg, P. A. Beck, Y. Chen, R. S. Williams, J. O. Jeppesen, K. A. Nielsen, and J. F. Stoddart, 'Molecule-independent electrical switching in Pt/organic monolayer/Ti devices', Nano Lett., Vol. 4, p. 133, 2004 https://doi.org/10.1021/nl034795u
  5. P. K. Hansma, 'Tunneling Spectroscopy', Plenum, New York, p. 312, 1982
  6. E. E. Polymeropoulos and J. Sagiv, 'Electrical conduction through adsorbed monolayers', J. Chem. Phys., Vol. 69, p. 1836, 1978 https://doi.org/10.1063/1.436844
  7. J. R. Koo, S. W. Pyo, J. H. Kim, D. Gong, S. Y. Kim, J. H. Seo, and Y. K. Kim, 'Improved yield in molecular electronic devices using amino-style molecules', Curr. Appl. Phys., Vol. 7, p. 384, 2007 https://doi.org/10.1016/j.cap.2006.09.029
  8. J. G. Simmons, 'Generalized formula for the electric tunnel effect between similar electrodes separated by a thin insulating film', J. Appl. Phys., Vol. 34, p. 1793, 1963 https://doi.org/10.1063/1.1702682
  9. S. C. Chang, Z. Li, C. N. Lau, B. Larade, and R. S. Williams, 'Investigation of a model molecular-electronic rectifier with an evaporated Ti-metal top contact', Appl. Phys. Lett., Vol. 83, p. 3198, 2003 https://doi.org/10.1063/1.1616989