Hostname: page-component-848d4c4894-pjpqr Total loading time: 0 Render date: 2024-06-19T22:44:10.237Z Has data issue: false hasContentIssue false
  • English
  • Français

Spin Injection and Spin Dynamics at CuPC/GaAs(100) Interface

Published online by Cambridge University Press:  26 February 2011

Huanjun Ding ,
Yongli Gao ,
Marina Sanchez-Albaneda ,
Jan-Peter Wüstenberg ,
Mirko Cinchetti ,
Oleksiy Andreyev ,
Michael Bauer  and
Martin Aeschlimann
Huanjun Ding
Affiliation:
hjding@pas.rochester.edu, University of Rochester, Department of Physics and Astronomy, Bausch and Lomb Hall,, University of Rochester, Rochester, NY, 14627, United States
Yongli Gao
Affiliation:
ygao@pas.rochester.edu, University of Rochester, Department of Physics and Astronomy, Bausch and Lomb Hall, University of Rochester, Rochester, NY, 14627, United States
Marina Sanchez-Albaneda
Affiliation:
sanchez@physik.uni-kl.de, University of Kaiserslautern, Kaiserslautern, 67663, Germany
Jan-Peter Wüstenberg
Affiliation:
jpwuest@physik.uni-kl.de, University of Kaiserslautern, Kaiserslautern, 67663, Germany
Mirko Cinchetti
Affiliation:
cinchett@rhrk.uni-kl.de, University of Kaiserslautern, Kaiserslautern, 67663, Germany
Oleksiy Andreyev
Affiliation:
andreev@phsik.uni-kl.de, University of Kaiserslautern, Kaiserslautern, 67663, Germany
Michael Bauer
Affiliation:
mkbauer@physik.uni-kl.de, University of Kaiserslautern, Kaiserslautern, 67663, Germany
Martin Aeschlimann
Affiliation:
ma@physik.uni-kl.de, University of Kaiserslautern, Kaiserslautern, 67663, Germany
Get access

Abstract

Spin injection from GaAs(100) to organic semiconductor copper phthalocyanine (CuPc) has been investigated experimentally with spin-resolved two-photon photoemission (SR-2PPE) spectroscopy. With SR-2PPE, the dynamics of both electron and spin relaxation have been studied with femtosecond time resolution. The spin-polarized electrons are originally generated in GaAs through optical pumping and injected into CuPc. We observed an enhancement in spin polarization at the interface after initial CuPc deposition. This demonstrates that interface spin scattering is insignificant, which is similar to our previous result of spin injection at CuPc/Co interface. The spin polarization dropped when the CuPc film became thick, an effect attributed to bulk attenuation in CuPc. The lifetime of the unoccupied orbits in CuPC was also studied with red-blue excitation of photon energy 1.56 eV and 3.12 eV, respectively. There was a strong asymmetry in the time-resolved spectra, and an unexpected long lifetime when the lower unoccupied orbital was excited. A simple explanation of this phenomenon will be discussed.

Keywords

spintronicorganicphotoemission
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 965: Symposium S – Organic Electronics – Materials, Devices and Applications , 2006 , 0965-S09-49
Copyright
Copyright © Materials Research Society 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Miller, J. S., Calabrese, J. C., Epstain, A. J., Bigelow, R. W., Zhang, J. H., and Reiff, W. M., J. Chem. Soc., Chem. Commun. 1026 (1986).Google Scholar
2. Chittipeddi, S., Cromack, K. R., Miller, J. S., and Epstain, A. J., Phys. Rev. Lett. 58, 2695 (1987).Google Scholar
3. Dediu, V., et al, Solid State Commun., 122, 181 (2002).Google Scholar
4. Xiong, Z. H., Wu, D., Vardeny, Z. V., and Shi, J., Nature, 427, 821 (2004).Google Scholar
5. Tsukagoshi, K., Alphenaar, B. W., and Ago, H., Nature, 401, 527 (1999).Google Scholar
6. Xie, S. J. et al., Phys. Rev. B, 67, 125202 (2003).Google Scholar
7. Andreyev, O., PhD Thesis, Technical University of Keiserslautern, 2006.Google Scholar
8. Kirschner, J., “Polarized Electrons at Surfaces,” Springer-Verlag, Berlin, 1985.Google Scholar
9. Schneider, H. C., wuestenberg, J. P., Andreyev, O., Hiebbner, K., Guo, L., Lange, J., Schreiber, L., Beschoten, B., Bauer, M., and Aeschlimann, M., Phys. Rev. B, 73, 081302 (2006).Google Scholar
10. Yan, L., Watkins, N. J., Zorba, S., Gao, Y., and Tang, C. W., Appl. Phys. Lett. 79, 4148 (2001).Google Scholar
11. Landolt-Bornstein, , Numerical data and functional relationships in science and technology, volume 17a, Springer, Berlin Heidelberg New York, 1982.Google Scholar
12. Elliott, R. J., Phys. Rev. 96, 266 (1954).Google Scholar
13. Tanaka, A., Yan, L., Watkins, N. J., and Gao, Y., J. Elec. Spec. Relat. Phen., 144, 327 (2005).Google Scholar