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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:
[email protected], University of Rochester, Department of Physics and Astronomy, Bausch and Lomb Hall,, University of Rochester, Rochester, NY, 14627, United States
Yongli Gao
Affiliation:
[email protected], University of Rochester, Department of Physics and Astronomy, Bausch and Lomb Hall, University of Rochester, Rochester, NY, 14627, United States
Marina Sanchez-Albaneda
Affiliation:
[email protected], University of Kaiserslautern, Kaiserslautern, 67663, Germany
Jan-Peter Wüstenberg
Affiliation:
[email protected], University of Kaiserslautern, Kaiserslautern, 67663, Germany
Mirko Cinchetti
Affiliation:
[email protected], University of Kaiserslautern, Kaiserslautern, 67663, Germany
Oleksiy Andreyev
Affiliation:
[email protected], University of Kaiserslautern, Kaiserslautern, 67663, Germany
Michael Bauer
Affiliation:
[email protected], University of Kaiserslautern, Kaiserslautern, 67663, Germany
Martin Aeschlimann
Affiliation:
[email protected], University of Kaiserslautern, Kaiserslautern, 67663, Germany
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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

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References

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